Merge branch 'main' into Prefab/Instantiate/Loop

Code/Framework/AzCore/AzCore/AzCoreModule.cpp

@@ -19,7 +19,6 @@
 #include <AzCore/Jobs/JobManagerComponent.h>
 #include <AzCore/Serialization/Json/JsonSystemComponent.h>
 #include <AzCore/Memory/MemoryComponent.h>
-#include <AzCore/NativeUI/NativeUISystemComponent.h>
 #include <AzCore/Script/ScriptSystemComponent.h>
 #include <AzCore/Slice/SliceComponent.h>
 #include <AzCore/Slice/SliceSystemComponent.h>
@@ -43,7 +42,6 @@ namespace AZ
             AssetManagerComponent::CreateDescriptor(),
             UserSettingsComponent::CreateDescriptor(),
             Debug::FrameProfilerComponent::CreateDescriptor(),
-            NativeUI::NativeUISystemComponent::CreateDescriptor(),
             SliceComponent::CreateDescriptor(),
             SliceSystemComponent::CreateDescriptor(),
             SliceMetadataInfoComponent::CreateDescriptor(),

Code/Framework/AzCore/AzCore/Component/ComponentApplication.cpp

@@ -28,6 +28,8 @@
 #include <AzCore/Memory/AllocatorManager.h>
 #include <AzCore/Memory/MallocSchema.h>
 
+#include <AzCore/NativeUI/NativeUIRequests.h>
+
 #include <AzCore/Serialization/EditContext.h>
 #include <AzCore/Serialization/ObjectStream.h>
 #include <AzCore/Serialization/Utils.h>
@@ -424,7 +426,7 @@ namespace AZ
 
         // Now that the Allocators are initialized, the Command Line parameters can be parsed
         m_commandLine.Parse(m_argC, m_argV);
-        ParseCommandLine(m_commandLine);
+        SettingsRegistryMergeUtils::ParseCommandLine(m_commandLine);
 
         // Create the settings registry and register it with the AZ interface system
         // This is done after the AppRoot has been calculated so that the Bootstrap.cfg
@@ -527,10 +529,42 @@ namespace AZ
         DestroyAllocator();
     }
 
+
+    void ReportBadEngineRoot()
+    {
+        AZStd::string errorMessage = {"Unable to determine a valid path to the engine.\n"
+                                      "Check parameters such as --project-path and --engine-path and make sure they are valid.\n"};
+        if (auto registry = AZ::SettingsRegistry::Get(); registry != nullptr)
+        {
+            AZ::SettingsRegistryInterface::FixedValueString filePathErrorStr;
+            if (registry->Get(filePathErrorStr, AZ::SettingsRegistryMergeUtils::FilePathKey_ErrorText); !filePathErrorStr.empty())
+            {
+                errorMessage += "Additional Info:\n";
+                errorMessage += filePathErrorStr.c_str();
+            }
+        }
+
+        if (auto nativeUI = AZ::Interface<AZ::NativeUI::NativeUIRequests>::Get(); nativeUI != nullptr)
+        {
+            nativeUI->DisplayOkDialog("O3DE Fatal Error", errorMessage.c_str(), false);
+        }
+        else
+        {
+            AZ_Error("ComponentApplication", false, "O3DE Fatal Error: %s\n", errorMessage.c_str());
+        }
+    }
+
+
     Entity* ComponentApplication::Create(const Descriptor& descriptor, const StartupParameters& startupParameters)
     {
         AZ_Assert(!m_isStarted, "Component application already started!");
 
+        if (m_engineRoot.empty())
+        {
+            ReportBadEngineRoot();
+            return nullptr;
+        }
+
         m_startupParameters = startupParameters;
 
         m_descriptor = descriptor;
@@ -871,46 +905,6 @@ namespace AZ
         }
     }
 
-    void ComponentApplication::ParseCommandLine(const AZ::CommandLine& commandLine)
-    {
-        struct OptionKeyToRegsetKey
-        {
-            AZStd::string_view m_optionKey;
-            AZStd::string m_regsetKey;
-        };
-
-        // Provide overrides for the engine root, the project root and the project cache root
-        AZStd::array commandOptions = {
-            OptionKeyToRegsetKey{ "engine-path", AZStd::string::format("%s/engine_path", AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey) },
-            OptionKeyToRegsetKey{ "project-path", AZStd::string::format("%s/project_path", AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey) },
-            OptionKeyToRegsetKey{ "project-cache-path", AZStd::string::format("%s/project_cache_path", AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey) }
-        };
-
-        AZStd::fixed_vector<AZStd::string, commandOptions.size()> overrideArgs;
-
-        for (auto&& [optionKey, regsetKey] : commandOptions)
-        {
-            if (size_t optionCount = commandLine.GetNumSwitchValues(optionKey); optionCount > 0)
-            {
-                // Use the last supplied command option value to override previous values
-                auto overrideArg = AZStd::string::format(R"(--regset="%s=%s")", regsetKey.c_str(),
-                    commandLine.GetSwitchValue(optionKey, optionCount - 1).c_str());
-                overrideArgs.emplace_back(AZStd::move(overrideArg));
-            }
-        }
-
-        if (!overrideArgs.empty())
-        {
-            // Dump the input command line, add the additional option overrides
-            // and Parse the new command line into the Component Application command line
-            AZ::CommandLine::ParamContainer commandLineArgs;
-            commandLine.Dump(commandLineArgs);
-            commandLineArgs.insert(commandLineArgs.end(), AZStd::make_move_iterator(overrideArgs.begin()),
-                AZStd::make_move_iterator(overrideArgs.end()));
-            m_commandLine.Parse(commandLineArgs);
-        }
-    }
-
     void ComponentApplication::MergeSettingsToRegistry(SettingsRegistryInterface& registry)
     {
         SettingsRegistryInterface::Specializations specializations;

Code/Framework/AzCore/AzCore/Component/ComponentApplication.h

@@ -328,9 +328,6 @@ namespace AZ
         /// Create the drillers
         void        CreateDrillers();
 
-        /// Parse ComponentApplication specific command line arguments
-        void ParseCommandLine(const AZ::CommandLine& commandLine);
-
         virtual void MergeSettingsToRegistry(SettingsRegistryInterface& registry);
 
         //! Sets the specializations that will be used when loading the Settings Registry. Extend this in derived

Code/Framework/AzCore/AzCore/NativeUI/NativeUIRequests.h

@@ -15,45 +15,49 @@
 #include <AzCore/EBus/EBus.h>
 #include <AzCore/std/string/string.h>
 
-namespace AZ
+namespace AZ::NativeUI
 {
-    namespace NativeUI
+    enum AssertAction
     {
-        enum AssertAction
-        {
-            IGNORE_ASSERT = 0,
-            IGNORE_ALL_ASSERTS,
-            BREAK,
-            NONE,
-        };
+        IGNORE_ASSERT = 0,
+        IGNORE_ALL_ASSERTS,
+        BREAK,
+        NONE,
+    };
 
-        class NativeUIRequests
-            : public AZ::EBusTraits
-        {
-        public:
-            //////////////////////////////////////////////////////////////////////////
-            // EBusTraits overrides
-            static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Single;
-            static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
-            using MutexType = AZStd::recursive_mutex;
+    class NativeUIRequests
+    {
+    public:
+        AZ_RTTI(NativeUIRequests, "{48361EE6-C1E7-4965-A13A-7425B2691817}");
+        virtual ~NativeUIRequests() = default;
 
-            // Waits for user to select an option before execution continues
-            // Returns the option string selected by the user
-            virtual AZStd::string DisplayBlockingDialog(const AZStd::string& /*title*/, const AZStd::string& /*message*/, const AZStd::vector<AZStd::string>& /*options*/) const { return ""; };
+        // Waits for user to select an option before execution continues
+        // Returns the option string selected by the user
+        virtual AZStd::string DisplayBlockingDialog(const AZStd::string& /*title*/, const AZStd::string& /*message*/, const AZStd::vector<AZStd::string>& /*options*/) const { return ""; };
 
-            // Waits for user to select an option ('Ok' or optionally 'Cancel') before execution continues
-            // Returns the option string selected by the user
-            virtual AZStd::string DisplayOkDialog(const AZStd::string& /*title*/, const AZStd::string& /*message*/, bool /*showCancel*/) const { return ""; };
+        // Waits for user to select an option ('Ok' or optionally 'Cancel') before execution continues
+        // Returns the option string selected by the user
+        virtual AZStd::string DisplayOkDialog(const AZStd::string& /*title*/, const AZStd::string& /*message*/, bool /*showCancel*/) const { return ""; };
 
-            // Waits for user to select an option ('Yes', 'No' or optionally 'Cancel') before execution continues
-            // Returns the option string selected by the user
-            virtual AZStd::string DisplayYesNoDialog(const AZStd::string& /*title*/, const AZStd::string& /*message*/, bool /*showCancel*/) const { return ""; };
+        // Waits for user to select an option ('Yes', 'No' or optionally 'Cancel') before execution continues
+        // Returns the option string selected by the user
+        virtual AZStd::string DisplayYesNoDialog(const AZStd::string& /*title*/, const AZStd::string& /*message*/, bool /*showCancel*/) const { return ""; };
 
-            // Displays an assert dialog box
-            // Returns the action selected by the user
-            virtual AssertAction DisplayAssertDialog(const AZStd::string& /*message*/) const { return AssertAction::NONE; };
-        };
+        // Displays an assert dialog box
+        // Returns the action selected by the user
+        virtual AssertAction DisplayAssertDialog(const AZStd::string& /*message*/) const { return AssertAction::NONE; };
+    };
 
-        using NativeUIRequestBus = AZ::EBus<NativeUIRequests>;
-    }
-}
+    class NativeUIEBusTraits
+        : public AZ::EBusTraits
+    {
+    public:
+        //////////////////////////////////////////////////////////////////////////
+        // EBusTraits overrides
+        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Single;
+        static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
+        using MutexType = AZStd::recursive_mutex;
+    };
+
+    using NativeUIRequestBus = AZ::EBus<NativeUIRequests, NativeUIEBusTraits>;
+} // namespace AZ::NativeUI

Code/Framework/AzCore/AzCore/NativeUI/NativeUISystemComponent.cpp

@@ -15,50 +15,19 @@
 
 #include <AzCore/NativeUI/NativeUISystemComponent.h>
 
-namespace AZ
+namespace AZ::NativeUI
 {
-    using namespace AZ::NativeUI;
-
-    void NativeUISystemComponent::Reflect(AZ::ReflectContext* context)
+    NativeUISystem::NativeUISystem()
     {
-        if (AZ::SerializeContext* serialize = azrtti_cast<AZ::SerializeContext*>(context))
-        {
-            serialize->Class<NativeUISystemComponent, AZ::Component>()
-                ->Version(0)
-                ;
-
-            if (AZ::EditContext* ec = serialize->GetEditContext())
-            {
-                ec->Class<NativeUISystemComponent>("NativeUI", "Adds basic support for native (platform specific) UI dialog boxes")
-                    ->ClassElement(AZ::Edit::ClassElements::EditorData, "")
-                        ->Attribute(AZ::Edit::Attributes::AppearsInAddComponentMenu, AZ_CRC("System", 0xc94d118b))
-                        ->Attribute(AZ::Edit::Attributes::AutoExpand, true)
-                    ;
-            }
-        }
+        NativeUIRequestBus::Handler::BusConnect();
     }
 
-    void NativeUISystemComponent::GetProvidedServices(AZ::ComponentDescriptor::DependencyArrayType& provided)
+    NativeUISystem::~NativeUISystem()
     {
-        provided.push_back(AZ_CRC("NativeUIService", 0x8ec25f87));
+        NativeUIRequestBus::Handler::BusDisconnect();
     }
 
-    void NativeUISystemComponent::GetIncompatibleServices(AZ::ComponentDescriptor::DependencyArrayType& incompatible)
-    {
-        incompatible.push_back(AZ_CRC("NativeUIService", 0x8ec25f87));
-    }
-
-    void NativeUISystemComponent::GetRequiredServices(AZ::ComponentDescriptor::DependencyArrayType& required)
-    {
-        (void)required;
-    }
-
-    void NativeUISystemComponent::GetDependentServices(AZ::ComponentDescriptor::DependencyArrayType& dependent)
-    {
-        (void)dependent;
-    }
-
-    AssertAction NativeUISystemComponent::DisplayAssertDialog(const AZStd::string& message) const
+    AssertAction NativeUISystem::DisplayAssertDialog(const AZStd::string& message) const
     {
         static const char* buttonNames[3] = { "Ignore", "Ignore All", "Break" };
         AZStd::vector<AZStd::string> options;
@@ -80,7 +49,7 @@ namespace AZ
         return AssertAction::NONE;
     }
 
-    AZStd::string NativeUISystemComponent::DisplayOkDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const
+    AZStd::string NativeUISystem::DisplayOkDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const
     {
         AZStd::vector<AZStd::string> options;
 
@@ -93,7 +62,7 @@ namespace AZ
         return DisplayBlockingDialog(title, message, options);
     }
 
-    AZStd::string NativeUISystemComponent::DisplayYesNoDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const
+    AZStd::string NativeUISystem::DisplayYesNoDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const
     {
         AZStd::vector<AZStd::string> options;
 
@@ -106,18 +75,4 @@ namespace AZ
 
         return DisplayBlockingDialog(title, message, options);
     }
-
-    void NativeUISystemComponent::Init()
-    {
-    }
-
-    void NativeUISystemComponent::Activate()
-    {
-        NativeUIRequestBus::Handler::BusConnect();
-    }
-
-    void NativeUISystemComponent::Deactivate()
-    {
-        NativeUIRequestBus::Handler::BusDisconnect();
-    }
-}
+} // namespace AZ::NativeUI

Code/Framework/AzCore/AzCore/NativeUI/NativeUISystemComponent.h

@@ -15,40 +15,24 @@
 #include <AzCore/Component/Component.h>
 #include <AzCore/NativeUI/NativeUIRequests.h>
 
-namespace AZ
+namespace AZ::NativeUI
 {
-    namespace NativeUI
+    class NativeUISystem
+        : public NativeUIRequestBus::Handler
     {
-        class NativeUISystemComponent
-            : public AZ::Component
-            , public NativeUIRequestBus::Handler
-        {
-        public:
-            AZ_COMPONENT(NativeUISystemComponent, "{E996C058-4AFE-4C8C-816F-98D864D8576D}");
+    public:
+        AZ_RTTI(NativeUISystem, "{FF534B2C-11BE-4DEA-A5B7-A4FA96FE1EDE}", NativeUIRequests);
+        AZ_CLASS_ALLOCATOR(NativeUISystem, AZ::OSAllocator, 0);
 
-            static void Reflect(AZ::ReflectContext* context);
+        NativeUISystem();
+        ~NativeUISystem() override;
 
-            static void GetProvidedServices(AZ::ComponentDescriptor::DependencyArrayType& provided);
-            static void GetIncompatibleServices(AZ::ComponentDescriptor::DependencyArrayType& incompatible);
-            static void GetRequiredServices(AZ::ComponentDescriptor::DependencyArrayType& required);
-            static void GetDependentServices(AZ::ComponentDescriptor::DependencyArrayType& dependent);
-
-            ////////////////////////////////////////////////////////////////////////
-            // NativeUIRequestBus interface implementation
-            AZStd::string DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const override;
-            AZStd::string DisplayOkDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const override;
-            AZStd::string DisplayYesNoDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const override;
-            AssertAction DisplayAssertDialog(const AZStd::string& message) const override;
-            ////////////////////////////////////////////////////////////////////////
-
-        protected:
-
-            ////////////////////////////////////////////////////////////////////////
-            // AZ::Component interface implementation
-            void Init() override;
-            void Activate() override;
-            void Deactivate() override;
-            ////////////////////////////////////////////////////////////////////////
-        };
-    }
-}
+        ////////////////////////////////////////////////////////////////////////
+        // NativeUIRequestBus interface implementation
+        AZStd::string DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const override;
+        AZStd::string DisplayOkDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const override;
+        AZStd::string DisplayYesNoDialog(const AZStd::string& title, const AZStd::string& message, bool showCancel) const override;
+        AssertAction DisplayAssertDialog(const AZStd::string& message) const override;
+        ////////////////////////////////////////////////////////////////////////
+    };
+} // namespace AZ::NativeUI

Code/Framework/AzCore/AzCore/Script/ScriptSystemComponent.cpp

@@ -853,7 +853,7 @@ const char* ScriptSystemComponent::GetGroup() const
 
 const char* AZ::ScriptSystemComponent::GetBrowserIcon() const
 {
-    return "Editor/Icons/Components/LuaScript.svg";
+    return "Icons/Components/LuaScript.svg";
 }
 
 AZ::Uuid AZ::ScriptSystemComponent::GetComponentTypeId() const

Code/Framework/AzCore/AzCore/Serialization/EditContextConstants.inl

@@ -118,6 +118,7 @@ namespace AZ
             const static AZ::Crc32 StringLineEditingCompleteNotify = AZ_CRC("StringLineEditingCompleteNotify", 0x139e5fa9);
 
             const static AZ::Crc32 NameLabelOverride = AZ_CRC("NameLabelOverride", 0x9ff79cab);
+            const static AZ::Crc32 AssetPickerTitle = AZ_CRC_CE("AssetPickerTitle");
             const static AZ::Crc32 ChildNameLabelOverride = AZ_CRC("ChildNameLabelOverride", 0x73dd2909);
             //! Container attribute that is used to override labels for its elements given the index of the element
             const static AZ::Crc32 IndexedChildNameLabelOverride = AZ_CRC("IndexedChildNameLabelOverride", 0x5f313ac2);

Code/Framework/AzCore/AzCore/Serialization/Json/ByteStreamSerializer.cpp

@@ -10,91 +10,75 @@
  *
  */
 
-#include "ByteStreamSerializer.h"
-
 #include <AzCore/Casting/numeric_cast.h>
 #include <AzCore/Memory/SystemAllocator.h>
+#include <AzCore/Serialization/Json/ByteStreamSerializer.h>
 #include <AzCore/Serialization/Json/JsonSerialization.h>
 #include <AzCore/StringFunc/StringFunc.h>
 
 namespace AZ
 {
-    namespace ByteSerializerInternal
-    {
-        static JsonSerializationResult::Result Load(void* outputValue, const rapidjson::Value& inputValue, JsonDeserializerContext& context)
-        {
-            using JsonSerializationResult::Outcomes;
-            using JsonSerializationResult::Tasks;
-
-            AZ_Assert(outputValue, "Expected a valid pointer to load from json value.");
-
-            switch (inputValue.GetType())
-            {
-            case rapidjson::kStringType: {
-                JsonByteStream buffer;
-                if (AZ::StringFunc::Base64::Decode(buffer, inputValue.GetString(), inputValue.GetStringLength()))
-                {
-                    JsonByteStream* valAsByteStream = static_cast<JsonByteStream*>(outputValue);
-                    *valAsByteStream = AZStd::move(buffer);
-                    return context.Report(Tasks::ReadField, Outcomes::Success, "Successfully read ByteStream.");
-                }
-                return context.Report(Tasks::ReadField, Outcomes::Invalid, "Decode of Base64 encoded ByteStream failed.");
-            }
-            case rapidjson::kArrayType:
-            case rapidjson::kObjectType:
-            case rapidjson::kNullType:
-            case rapidjson::kFalseType:
-            case rapidjson::kTrueType:
-            case rapidjson::kNumberType:
-                return context.Report(
-                    Tasks::ReadField, Outcomes::Unsupported,
-                    "Unsupported type. ByteStream values cannot be read from arrays, objects, nulls, booleans or numbers.");
-            default:
-                return context.Report(Tasks::ReadField, Outcomes::Unknown, "Unknown json type encountered for ByteStream value.");
-            }
-        }
-
-        static JsonSerializationResult::Result StoreWithDefault(
-            rapidjson::Value& outputValue, const void* inputValue, const void* defaultValue, JsonSerializerContext& context)
-        {
-            using JsonSerializationResult::Outcomes;
-            using JsonSerializationResult::Tasks;
-
-            const JsonByteStream& valAsByteStream = *static_cast<const JsonByteStream*>(inputValue);
-            if (context.ShouldKeepDefaults() || !defaultValue || (valAsByteStream != *static_cast<const JsonByteStream*>(defaultValue)))
-            {
-                const auto base64ByteStream = AZ::StringFunc::Base64::Encode(valAsByteStream.data(), valAsByteStream.size());
-                outputValue.SetString(base64ByteStream.c_str(), base64ByteStream.size(), context.GetJsonAllocator());
-                return context.Report(Tasks::WriteValue, Outcomes::Success, "ByteStream successfully stored.");
-            }
-
-            return context.Report(Tasks::WriteValue, Outcomes::DefaultsUsed, "Default ByteStream used.");
-        }
-    } // namespace ByteSerializerInternal
-
     AZ_CLASS_ALLOCATOR_IMPL(JsonByteStreamSerializer, SystemAllocator, 0);
 
     JsonSerializationResult::Result JsonByteStreamSerializer::Load(
         void* outputValue, [[maybe_unused]] const Uuid& outputValueTypeId, const rapidjson::Value& inputValue,
         JsonDeserializerContext& context)
     {
+        using JsonSerializationResult::Outcomes;
+        using JsonSerializationResult::Tasks;
+
         AZ_Assert(
             azrtti_typeid<JsonByteStream>() == outputValueTypeId,
             "Unable to deserialize AZStd::vector<AZ::u8>> to json because the provided type is %s",
             outputValueTypeId.ToString<AZStd::string>().c_str());
+        AZ_Assert(outputValue, "Expected a valid pointer to load from json value.");
 
-        return ByteSerializerInternal::Load(outputValue, inputValue, context);
+        switch (inputValue.GetType())
+        {
+        case rapidjson::kStringType: {
+            JsonByteStream buffer;
+            if (AZ::StringFunc::Base64::Decode(buffer, inputValue.GetString(), inputValue.GetStringLength()))
+            {
+                JsonByteStream* valAsByteStream = static_cast<JsonByteStream*>(outputValue);
+                *valAsByteStream = AZStd::move(buffer);
+                return context.Report(Tasks::ReadField, Outcomes::Success, "Successfully read ByteStream.");
+            }
+            return context.Report(Tasks::ReadField, Outcomes::Invalid, "Decode of Base64 encoded ByteStream failed.");
+        }
+        case rapidjson::kArrayType:
+        case rapidjson::kObjectType:
+        case rapidjson::kNullType:
+        case rapidjson::kFalseType:
+        case rapidjson::kTrueType:
+        case rapidjson::kNumberType:
+            return context.Report(
+                Tasks::ReadField, Outcomes::Unsupported,
+                "Unsupported type. ByteStream values cannot be read from arrays, objects, nulls, booleans or numbers.");
+        default:
+            return context.Report(Tasks::ReadField, Outcomes::Unknown, "Unknown json type encountered for ByteStream value.");
+        }
     }
 
     JsonSerializationResult::Result JsonByteStreamSerializer::Store(
         rapidjson::Value& outputValue, const void* inputValue, const void* defaultValue, [[maybe_unused]] const Uuid& valueTypeId,
         JsonSerializerContext& context)
     {
+        using JsonSerializationResult::Outcomes;
+        using JsonSerializationResult::Tasks;
+
         AZ_Assert(
             azrtti_typeid<JsonByteStream>() == valueTypeId,
             "Unable to serialize AZStd::vector<AZ::u8> to json because the provided type is %s",
             valueTypeId.ToString<AZStd::string>().c_str());
 
-        return ByteSerializerInternal::StoreWithDefault(outputValue, inputValue, defaultValue, context);
+        const JsonByteStream& valAsByteStream = *static_cast<const JsonByteStream*>(inputValue);
+        if (context.ShouldKeepDefaults() || !defaultValue || (valAsByteStream != *static_cast<const JsonByteStream*>(defaultValue)))
+        {
+            const auto base64ByteStream = AZ::StringFunc::Base64::Encode(valAsByteStream.data(), valAsByteStream.size());
+            outputValue.SetString(base64ByteStream.c_str(), base64ByteStream.size(), context.GetJsonAllocator());
+            return context.Report(Tasks::WriteValue, Outcomes::Success, "ByteStream successfully stored.");
+        }
+
+        return context.Report(Tasks::WriteValue, Outcomes::DefaultsUsed, "Default ByteStream used.");
     }
 } // namespace AZ

Code/Framework/AzCore/AzCore/Serialization/Json/JsonSerializer.cpp

@@ -104,13 +104,12 @@ namespace AZ
         auto serializer = context.GetRegistrationContext()->GetSerializerForType(classData.m_typeId);
         if (serializer)
         {
-            if (storeTypeId == StoreTypeId::Yes)
+            ResultCode result = serializer->Store(node, object, defaultObject, classData.m_typeId, context);
+            if (storeTypeId == StoreTypeId::Yes && result.GetProcessing() != Processing::Halted)
             {
-                return context.Report(Tasks::WriteValue, Outcomes::Catastrophic,
-                    "Unable to store type information in a JSON Serializer primitive.");
+                result.Combine(InsertTypeId(node, classData, context));
             }
-
-            return serializer->Store(node, object, defaultObject, classData.m_typeId, context);
+            return result;
         }
 
         if (classData.m_azRtti && (classData.m_azRtti->GetTypeTraits() & AZ::TypeTraits::is_enum) == AZ::TypeTraits::is_enum)
@@ -128,13 +127,12 @@ namespace AZ
             serializer = context.GetRegistrationContext()->GetSerializerForType(classData.m_azRtti->GetGenericTypeId());
             if (serializer)
             {
-                if (storeTypeId == StoreTypeId::Yes)
+                ResultCode result = serializer->Store(node, object, defaultObject, classData.m_typeId, context);
+                if (storeTypeId == StoreTypeId::Yes && result.GetProcessing() != Processing::Halted)
                 {
-                    return context.Report(Tasks::WriteValue, Outcomes::Catastrophic,
-                        "Unable to store type information in a JSON Serializer primitive.");
+                    result.Combine(InsertTypeId(node, classData, context));
                 }
-
-                return serializer->Store(node, object, defaultObject, classData.m_typeId, context);
+                return result;
             }
         }
         
@@ -149,6 +147,7 @@ namespace AZ
             ResultCode result(Tasks::WriteValue);
             if (storeTypeId == StoreTypeId::Yes)
             {
+                // Not using InsertTypeId here to avoid needing to create the temporary value and swap it in that call.
                 node.AddMember(rapidjson::StringRef(JsonSerialization::TypeIdFieldIdentifier),
                     StoreTypeName(classData, context), context.GetJsonAllocator());
                 result = ResultCode(Tasks::WriteValue, Outcomes::Success);
@@ -569,6 +568,31 @@ namespace AZ
         }
     }
 
+    JsonSerializationResult::ResultCode JsonSerializer::InsertTypeId(
+        rapidjson::Value& output, const SerializeContext::ClassData& classData, JsonSerializerContext& context)
+    {
+        using namespace JsonSerializationResult;
+
+        if (output.IsObject())
+        {
+            rapidjson::Value insertedObject(rapidjson::kObjectType);
+            insertedObject.AddMember(
+                rapidjson::StringRef(JsonSerialization::TypeIdFieldIdentifier), StoreTypeName(classData, context),
+                context.GetJsonAllocator());
+
+            for (auto& element : output.GetObject())
+            {
+                insertedObject.AddMember(AZStd::move(element.name), AZStd::move(element.value), context.GetJsonAllocator());
+            }
+            output = AZStd::move(insertedObject);
+            return ResultCode(Tasks::WriteValue, Outcomes::Success);
+        }
+        else
+        {
+            return context.Report(Tasks::WriteValue, Outcomes::Catastrophic, "Only able to store type information in a JSON Object.");
+        }
+    }
+
     rapidjson::Value JsonSerializer::GetExplicitDefault()
     {
         return rapidjson::Value(rapidjson::kObjectType);

Code/Framework/AzCore/AzCore/Serialization/Json/JsonSerializer.h

@@ -80,6 +80,9 @@ namespace AZ
         static JsonSerializationResult::ResultCode StoreTypeName(rapidjson::Value& output,
             const Uuid& typeId, JsonSerializerContext& context);
 
+        static JsonSerializationResult::ResultCode InsertTypeId(
+            rapidjson::Value& output, const SerializeContext::ClassData& classData, JsonSerializerContext& context);
+
         static rapidjson::Value GetExplicitDefault();
     };
 } // namespace AZ

Code/Framework/AzCore/AzCore/Settings/SettingsRegistry.h

@@ -256,7 +256,7 @@ namespace AZ
 
         //! Remove the value at the provided path 
         //! @param path The path to a value that should be removed
-        //! @return Whether or not the value was stored at the provided path. An invalid path will return false;
+        //! @return Whether or not the path was found and removed. An invalid path will return false;
         virtual bool Remove(AZStd::string_view path) = 0;
 
         //! Structure which contains configuration settings for how to parse a single command line argument

Code/Framework/AzCore/AzCore/Settings/SettingsRegistryMergeUtils.cpp

@@ -32,17 +32,12 @@
 namespace AZ::Internal
 {
     AZ::SettingsRegistryInterface::FixedValueString GetEngineMonikerForProject(
-        SettingsRegistryInterface& settingsRegistry, const AZ::IO::FixedMaxPath& projectPath)
+        SettingsRegistryInterface& settingsRegistry, const AZ::IO::FixedMaxPath& projectJsonPath)
     {
         // projectPath needs to be an absolute path here.
         using namespace AZ::SettingsRegistryMergeUtils;
-        bool projectJsonMerged = false;
-        auto projectJsonPath = projectPath / "project.json";
-        if (AZ::IO::SystemFile::Exists(projectJsonPath.c_str()))
-        {
-            projectJsonMerged = settingsRegistry.MergeSettingsFile(
-                projectJsonPath.Native(), AZ::SettingsRegistryInterface::Format::JsonMergePatch, ProjectSettingsRootKey);
-        }
+        bool projectJsonMerged = settingsRegistry.MergeSettingsFile(
+            projectJsonPath.Native(), AZ::SettingsRegistryInterface::Format::JsonMergePatch, ProjectSettingsRootKey);
 
         AZ::SettingsRegistryInterface::FixedValueString engineMoniker;
         if (projectJsonMerged)
@@ -105,12 +100,12 @@ namespace AZ::Internal
 
             const auto engineMonikerKey = AZ::SettingsRegistryInterface::FixedValueString::format("%s/engine_name", EngineSettingsRootKey);
 
+            AZStd::set<AZ::IO::FixedMaxPath> projectPathsNotFound;
+
             for (EngineInfo& engineInfo : pathVisitor.m_enginePaths)
             {
-                AZ::IO::FixedMaxPath engineSettingsPath{engineInfo.m_path};
-                engineSettingsPath /= "engine.json";
-
-                if (AZ::IO::SystemFile::Exists(engineSettingsPath.c_str()))
+                if (auto engineSettingsPath = AZ::IO::FixedMaxPath{engineInfo.m_path} / "engine.json";
+                    AZ::IO::SystemFile::Exists(engineSettingsPath.c_str()))
                 {
                     if (settingsRegistry.MergeSettingsFile(
                             engineSettingsPath.Native(), AZ::SettingsRegistryInterface::Format::JsonMergePatch, EngineSettingsRootKey))
@@ -119,12 +114,61 @@ namespace AZ::Internal
                     }
                 }
 
-                auto engineMoniker = Internal::GetEngineMonikerForProject(settingsRegistry, engineInfo.m_path / projectPath);
-                if (!engineMoniker.empty() && engineMoniker == engineInfo.m_moniker)
+                if (auto projectJsonPath = (engineInfo.m_path / projectPath / "project.json").LexicallyNormal();
+                    AZ::IO::SystemFile::Exists(projectJsonPath.c_str()))
                 {
-                    engineRoot = engineInfo.m_path;
-                    break;
+                    if (auto engineMoniker = Internal::GetEngineMonikerForProject(settingsRegistry, projectJsonPath);
+                        !engineMoniker.empty() && engineMoniker == engineInfo.m_moniker)
+                    {
+                        engineRoot = engineInfo.m_path;
+                        break;
+                    }
                 }
+                else
+                {
+                    projectPathsNotFound.insert(projectJsonPath);
+                }
+
+                // Continue looking for candidates, remove the previous engine and project settings that were merged above.
+                settingsRegistry.Remove(ProjectSettingsRootKey);
+                settingsRegistry.Remove(EngineSettingsRootKey);
+            }
+
+            if (engineRoot.empty())
+            {
+                AZStd::string errorStr;
+                if (!projectPathsNotFound.empty())
+                {
+                    // This case is usually encountered when a project path is given as a relative path,
+                    // which is assumed to be relative to an engine root.
+                    // When no project.json files are found this way, dump this error message about
+                    // which project paths were checked.
+                    AZStd::string projectPathsTested;
+                    for (const auto& path : projectPathsNotFound)
+                    {
+                        projectPathsTested.append(AZStd::string::format("  %s\n", path.c_str()));
+                    }
+                    errorStr = AZStd::string::format("No valid project was found at these locations:\n%s"
+                        "Please supply a valid --project-path to the application.",
+                        projectPathsTested.c_str());
+                }
+                else
+                {
+                    // The other case is that a project.json was found, but after checking all the registered engines
+                    // none of them matched the engine moniker.
+                    AZStd::string enginePathsChecked;
+                    for (const auto& engineInfo : pathVisitor.m_enginePaths)
+                    {
+                        enginePathsChecked.append(AZStd::string::format("  %s (%s)\n", engineInfo.m_path.c_str(), engineInfo.m_moniker.c_str()));
+                    }
+                    errorStr = AZStd::string::format(
+                        "No engine was found in o3de_manifest.json with a name that matches the one set in the project.json.\n"
+                        "Engines that were checked:\n%s"
+                        "Please check that your engine and project have both been registered with scripts/o3de.py.", enginePathsChecked.c_str()
+                    );
+                }
+
+                settingsRegistry.Set(FilePathKey_ErrorText, errorStr.c_str());
             }
         }
 
@@ -158,7 +202,7 @@ namespace AZ::Internal
         return {};
     }
 
-    void InjectSettingToCommandLineFront(AZ::SettingsRegistryInterface& settingsRegistry,
+    void InjectSettingToCommandLineBack(AZ::SettingsRegistryInterface& settingsRegistry,
         AZStd::string_view path, AZStd::string_view value)
     {
         AZ::CommandLine commandLine;
@@ -168,7 +212,7 @@ namespace AZ::Internal
 
         auto projectPathOverride = AZStd::string::format(R"(--regset="%.*s=%.*s")",
             aznumeric_cast<int>(path.size()), path.data(), aznumeric_cast<int>(value.size()), value.data());
-        paramContainer.emplace(paramContainer.begin(), AZStd::move(projectPathOverride));
+        paramContainer.emplace(paramContainer.end(), AZStd::move(projectPathOverride));
         commandLine.Parse(paramContainer);
         AZ::SettingsRegistryMergeUtils::StoreCommandLineToRegistry(settingsRegistry, commandLine);
     }
@@ -197,8 +241,8 @@ namespace AZ::SettingsRegistryMergeUtils
             if (!engineRoot.empty())
             {
                 settingsRegistry.Set(engineRootKey, engineRoot.Native());
-                // Inject the engine root into the front of the command line settings
-                Internal::InjectSettingToCommandLineFront(settingsRegistry, engineRootKey, engineRoot.Native());
+                // Inject the engine root at the end of the command line settings
+                Internal::InjectSettingToCommandLineBack(settingsRegistry, engineRootKey, engineRoot.Native());
                 return engineRoot;
             }
         }
@@ -244,8 +288,8 @@ namespace AZ::SettingsRegistryMergeUtils
             if (!projectRoot.empty())
             {
                 settingsRegistry.Set(projectRootKey, projectRoot.c_str());
-                // Inject the project root into the front of the command line settings
-                Internal::InjectSettingToCommandLineFront(settingsRegistry, projectRootKey, projectRoot.Native());
+                // Inject the project root at the end of the command line settings
+                Internal::InjectSettingToCommandLineBack(settingsRegistry, projectRootKey, projectRoot.Native());
                 return projectRoot;
             }
         }
@@ -654,7 +698,6 @@ namespace AZ::SettingsRegistryMergeUtils
         if (registry.Get(engineRootPath, FilePathKey_EngineRootFolder))
         {
             AZ::IO::FixedMaxPath mergePath{ AZStd::move(engineRootPath) };
-            mergePath /= "Engine";
             mergePath /= SettingsRegistryInterface::RegistryFolder;
             registry.MergeSettingsFolder(mergePath.Native(), specializations, platform, "", scratchBuffer);
         }
@@ -875,6 +918,49 @@ namespace AZ::SettingsRegistryMergeUtils
         return true;
     }
 
+    void ParseCommandLine(AZ::CommandLine& commandLine)
+    {
+        struct OptionKeyToRegsetKey
+        {
+            AZStd::string_view m_optionKey;
+            AZStd::string m_regsetKey;
+        };
+
+        // Provide overrides for the engine root, the project root and the project cache root
+        AZStd::array commandOptions = {
+            OptionKeyToRegsetKey{
+                "engine-path", AZStd::string::format("%s/engine_path", AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey)},
+            OptionKeyToRegsetKey{
+                "project-path", AZStd::string::format("%s/project_path", AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey)},
+            OptionKeyToRegsetKey{
+                "project-cache-path",
+                AZStd::string::format("%s/project_cache_path", AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey)}};
+
+        AZStd::fixed_vector<AZStd::string, commandOptions.size()> overrideArgs;
+
+        for (auto&& [optionKey, regsetKey] : commandOptions)
+        {
+            if (size_t optionCount = commandLine.GetNumSwitchValues(optionKey); optionCount > 0)
+            {
+                // Use the last supplied command option value to override previous values
+                auto overrideArg = AZStd::string::format(
+                    R"(--regset="%s=%s")", regsetKey.c_str(), commandLine.GetSwitchValue(optionKey, optionCount - 1).c_str());
+                overrideArgs.emplace_back(AZStd::move(overrideArg));
+            }
+        }
+
+        if (!overrideArgs.empty())
+        {
+            // Dump the input command line, add the additional option overrides
+            // and Parse the new command line args (write back) into the input command line.
+            AZ::CommandLine::ParamContainer commandLineArgs;
+            commandLine.Dump(commandLineArgs);
+            commandLineArgs.insert(
+                commandLineArgs.end(), AZStd::make_move_iterator(overrideArgs.begin()), AZStd::make_move_iterator(overrideArgs.end()));
+            commandLine.Parse(commandLineArgs);
+        }
+    }
+
     bool DumpSettingsRegistryToStream(SettingsRegistryInterface& registry, AZStd::string_view key,
         AZ::IO::GenericStream& stream, const DumperSettings& dumperSettings)
     {

Code/Framework/AzCore/AzCore/Settings/SettingsRegistryMergeUtils.h

@@ -55,6 +55,9 @@ namespace AZ::SettingsRegistryMergeUtils
     //! Development write storage path may be considered temporary or cache storage on some platforms
     inline static constexpr char FilePathKey_DevWriteStorage[] = "/Amazon/AzCore/Runtime/FilePaths/DevWriteStorage";
 
+    //! Stores error text regarding engine boot sequence when engine and project roots cannot be determined
+    inline static constexpr char FilePathKey_ErrorText[] = "/Amazon/AzCore/Runtime/FilePaths/ErrorText";
+
     //! Root key for where command line are stored at within the settings registry
     inline static constexpr char CommandLineRootKey[] = "/Amazon/AzCore/Runtime/CommandLine";
     //! Key set to trigger a notification that the CommandLine has been stored within the settings registry
@@ -219,6 +222,9 @@ namespace AZ::SettingsRegistryMergeUtils
     //! into the AZ::CommandLine instance
     bool GetCommandLineFromRegistry(SettingsRegistryInterface& registry, AZ::CommandLine& commandLine);
 
+    //! Parse a CommandLine and transform certain options into formal "regset" options
+    void ParseCommandLine(AZ::CommandLine& commandLine);
+
     //! Structure for configuring how values should be dumped from the Settings Registry
     struct DumperSettings
     {

Code/Framework/AzCore/Platform/Android/AzCore/NativeUI/NativeUISystemComponent_Android.cpp

@@ -22,7 +22,7 @@ namespace AZ
 {
     namespace NativeUI
     {
-        AZStd::string NativeUISystemComponent::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
+        AZStd::string NativeUISystem::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
         {
             AZ::Android::JNI::Object object("com/amazon/lumberyard/NativeUI/LumberyardNativeUI");
             object.RegisterStaticMethod("DisplayDialog", "(Landroid/app/Activity;Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;)V");

Code/Framework/AzCore/Platform/Common/Unimplemented/AzCore/NativeUI/NativeUISystemComponent_Unimplemented.cpp

@@ -12,16 +12,11 @@
 
 #include <AzCore/NativeUI/NativeUISystemComponent.h>
 
-namespace AZ
+namespace AZ::NativeUI
 {
-    namespace NativeUI
+    AZStd::string NativeUISystem::DisplayBlockingDialog([[maybe_unused]] const AZStd::string& title, [[maybe_unused]] const AZStd::string& message,
+        [[maybe_unused]] const AZStd::vector<AZStd::string>& options) const
     {
-        AZStd::string NativeUISystemComponent::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
-        {
-            AZ_UNUSED(title);
-            AZ_UNUSED(message);
-            AZ_UNUSED(options);
-            return "";
-        }
+        return {};
     }
 }

Code/Framework/AzCore/Platform/Mac/AzCore/NativeUI/NativeUISystemComponent_Mac.mm

@@ -26,7 +26,7 @@ namespace AZ
 {
     namespace NativeUI
     {
-        AZStd::string NativeUISystemComponent::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
+        AZStd::string NativeUISystem::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
         {
             __block NSModalResponse response = -1;
             

Code/Framework/AzCore/Platform/Windows/AzCore/NativeUI/NativeUISystemComponent_Windows.cpp

@@ -245,7 +245,7 @@ namespace AZ
 {
     namespace NativeUI
     {
-        AZStd::string NativeUISystemComponent::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
+        AZStd::string NativeUISystem::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
         {
             if (options.size() >= MAX_ITEMS)
             {

Code/Framework/AzCore/Platform/iOS/AzCore/NativeUI/NativeUISystemComponent_iOS.mm

@@ -18,7 +18,7 @@ namespace AZ
 {
     namespace NativeUI
     {
-        AZStd::string NativeUISystemComponent::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
+        AZStd::string NativeUISystem::DisplayBlockingDialog(const AZStd::string& title, const AZStd::string& message, const AZStd::vector<AZStd::string>& options) const
         {
             __block AZStd::string userSelection = "";
             

Code/Framework/AzCore/Tests/Serialization/Json/JsonSerializationTests.cpp

@@ -449,6 +449,46 @@ namespace JsonSerializationTests
 
     }
 
+    TEST_F(JsonSerializationTests, Load_PrimitiveForInheritedClass_LoadsCorrectClass)
+    {
+        using namespace AZ::JsonSerializationResult;
+        using namespace ::testing;
+
+        AZStd::string json = AZStd::string::format(R"(
+            {
+                "%s": "SimpleInheritence",
+                "base_var": -88.0,
+                "var1": 88,
+                "var2": 42
+            })",
+            AZ::JsonSerialization::TypeIdFieldIdentifier);
+        m_jsonDocument->Parse(json.c_str());
+
+        SimpleInheritence::Reflect(m_serializeContext, true);
+        m_serializeContext->RegisterGenericType<AZStd::unique_ptr<BaseClass>>();
+        m_jsonRegistrationContext->Serializer<JsonSerializerMock>()->HandlesType<SimpleInheritence>();
+        JsonSerializerMock* mock =
+            reinterpret_cast<JsonSerializerMock*>(m_jsonRegistrationContext->GetSerializerForType(azrtti_typeid<SimpleInheritence>()));
+        EXPECT_CALL(*mock, Load(_, _, _, _))
+            .Times(Exactly(1))
+            .WillRepeatedly(Return(Result(m_deserializationSettings->m_reporting, "Test", Tasks::ReadField, Outcomes::Success, "")));
+
+        AZStd::unique_ptr<BaseClass> instance;
+        ResultCode result = AZ::JsonSerialization::Load(instance, *m_jsonDocument, *m_deserializationSettings);
+        EXPECT_NE(Processing::Halted, result.GetProcessing());
+
+        EXPECT_EQ(azrtti_typeid<SimpleInheritence>(), azrtti_typeid(*instance));
+
+        m_serializeContext->EnableRemoveReflection();
+        SimpleInheritence::Reflect(m_serializeContext, true);
+        m_serializeContext->DisableRemoveReflection();
+
+        m_jsonRegistrationContext->EnableRemoveReflection();
+        m_serializeContext->RegisterGenericType<AZStd::unique_ptr<BaseClass>>();
+        m_jsonRegistrationContext->Serializer<JsonSerializerMock>()->HandlesType<SimpleInheritence>();
+        m_jsonRegistrationContext->DisableRemoveReflection();
+    }
+
     TEST_F(JsonSerializationTests, Store_TemplatedClassWithRegisteredHandler_StoreOnHandlerCalled)
     {
         using namespace AZ::JsonSerializationResult;
@@ -474,6 +514,52 @@ namespace JsonSerializationTests
         m_jsonRegistrationContext->DisableRemoveReflection();
     }
 
+    TEST_F(JsonSerializationTests, Store_PrimitiveForInheritedClass_StoreSucceedsAndTypeIdIsAdded)
+    {
+        using namespace AZ::JsonSerializationResult;
+        using namespace ::testing;
+
+        SimpleInheritence::Reflect(m_serializeContext, true);
+        m_serializeContext->RegisterGenericType<AZStd::unique_ptr<BaseClass>>();
+        m_jsonRegistrationContext->Serializer<JsonSerializerMock>()->HandlesType<SimpleInheritence>();
+        JsonSerializerMock* mock =
+            reinterpret_cast<JsonSerializerMock*>(m_jsonRegistrationContext->GetSerializerForType(azrtti_typeid<SimpleInheritence>()));
+        EXPECT_CALL(*mock, Store(_, _, _, _, _))
+            .Times(Exactly(1))
+            .WillRepeatedly(Invoke([](rapidjson::Value& output, const void*, const void*, const AZ::Uuid&, AZ::JsonSerializerContext& context)
+                {
+                    // Insert some values to allow verification later on.
+                    output.SetObject();
+                    output.AddMember("base_var", -88.0, context.GetJsonAllocator());
+                    output.AddMember("var1", 88, context.GetJsonAllocator());
+                    output.AddMember("var2", 42, context.GetJsonAllocator());
+                    return context.Report(Tasks::WriteValue, Outcomes::Success, "");
+                }));
+
+        AZStd::unique_ptr<BaseClass> instance{ aznew SimpleInheritence() };
+        ResultCode result = AZ::JsonSerialization::Store(*m_jsonDocument, m_jsonDocument->GetAllocator(), instance, *m_serializationSettings);
+        EXPECT_NE(Processing::Halted, result.GetProcessing());
+
+        AZStd::string compare = AZStd::string::format(R"(
+            {
+                "%s": "SimpleInheritence",
+                "base_var": -88.0,
+                "var1": 88,
+                "var2": 42
+            })",
+            AZ::JsonSerialization::TypeIdFieldIdentifier);
+        Expect_DocStrEq(compare.c_str());
+
+        m_serializeContext->EnableRemoveReflection();
+        m_serializeContext->RegisterGenericType<AZStd::unique_ptr<BaseClass>>();
+        SimpleInheritence::Reflect(m_serializeContext, true);
+        m_serializeContext->DisableRemoveReflection();
+
+        m_jsonRegistrationContext->EnableRemoveReflection();
+        m_jsonRegistrationContext->Serializer<JsonSerializerMock>()->HandlesType<SimpleInheritence>();
+        m_jsonRegistrationContext->DisableRemoveReflection();
+    }
+
     TEST_F(JsonSerializationTests, Store_StoreWithNullPtr_ReturnsCatastrophic)
     {
         using namespace AZ::JsonSerializationResult;

Code/Framework/AzFramework/AzFramework/Application/Application.cpp

@@ -175,7 +175,7 @@ namespace AzFramework
         }
 
         // Initializes the IArchive for reading archive(.pak) files
-        if (auto archive = AZ::Interface<AZ::IO::IArchive>::Get(); !archive)
+        if (auto archive = AZ::Interface<AZ::IO::IArchive>::Get(); archive == nullptr)
         {
             m_archive = AZStd::make_unique<AZ::IO::Archive>();
             AZ::Interface<AZ::IO::IArchive>::Register(m_archive.get());
@@ -189,6 +189,12 @@ namespace AzFramework
             SetFileIOAliases();
         }
 
+        if (auto nativeUI = AZ::Interface<AZ::NativeUI::NativeUIRequests>::Get(); nativeUI == nullptr)
+        {
+            m_nativeUI = AZStd::make_unique<AZ::NativeUI::NativeUISystem>();
+            AZ::Interface<AZ::NativeUI::NativeUIRequests>::Register(m_nativeUI.get());
+        }
+
         ApplicationRequests::Bus::Handler::BusConnect();
         AZ::UserSettingsFileLocatorBus::Handler::BusConnect();
         NetSystemRequestBus::Handler::BusConnect();
@@ -205,12 +211,17 @@ namespace AzFramework
         AZ::UserSettingsFileLocatorBus::Handler::BusDisconnect();
         ApplicationRequests::Bus::Handler::BusDisconnect();
 
+        if (AZ::Interface<AZ::NativeUI::NativeUIRequests>::Get() == m_nativeUI.get())
+        {
+            AZ::Interface<AZ::NativeUI::NativeUIRequests>::Unregister(m_nativeUI.get());
+        }
+        m_nativeUI.reset();
+
         // Unset the Archive file IO if it is set as the direct instance
         if (AZ::IO::FileIOBase::GetInstance() == m_archiveFileIO.get())
         {
             AZ::IO::FileIOBase::SetInstance(nullptr);
         }
-
         m_archiveFileIO.reset();
 
         // Destroy the IArchive instance
@@ -303,7 +314,6 @@ namespace AzFramework
             azrtti_typeid<AZ::AssetManagerComponent>(),
             azrtti_typeid<AZ::UserSettingsComponent>(),
             azrtti_typeid<AZ::Debug::FrameProfilerComponent>(),
-            azrtti_typeid<AZ::NativeUI::NativeUISystemComponent>(),
             azrtti_typeid<AZ::SliceComponent>(),
             azrtti_typeid<AZ::SliceSystemComponent>(),
 
@@ -372,7 +382,6 @@ namespace AzFramework
             azrtti_typeid<AZ::UserSettingsComponent>(),
             azrtti_typeid<AZ::ScriptSystemComponent>(),
             azrtti_typeid<AZ::JobManagerComponent>(),
-            azrtti_typeid<AZ::NativeUI::NativeUISystemComponent>(),
             azrtti_typeid<AZ::SliceSystemComponent>(),
 
             azrtti_typeid<AzFramework::AssetCatalogComponent>(),

Code/Framework/AzFramework/AzFramework/Application/Application.h

@@ -16,6 +16,7 @@
 #include <AzCore/Component/ComponentApplication.h>
 #include <AzCore/UserSettings/UserSettings.h>
 #include <AzCore/Math/Uuid.h>
+#include <AzCore/NativeUI/NativeUIRequests.h>
 #include <AzCore/IO/SystemFile.h>
 #include <AzCore/std/smart_ptr/unique_ptr.h>
 #include <AzCore/std/string/fixed_string.h>
@@ -187,6 +188,7 @@ namespace AzFramework
         AZStd::unique_ptr<AZ::IO::FileIOBase> m_archiveFileIO; ///> The Default file IO instance is a ArchiveFileIO.
         AZStd::unique_ptr<AZ::IO::Archive> m_archive; ///> The AZ::IO::Instance
         AZStd::unique_ptr<Implementation> m_pimpl;
+        AZStd::unique_ptr<AZ::NativeUI::NativeUIRequests> m_nativeUI;
         bool m_ownsConsole = false;
 
         bool m_exitMainLoopRequested = false;

Code/Framework/AzFramework/AzFramework/Asset/AssetCatalog.cpp

@@ -809,7 +809,7 @@ namespace AzFramework
     #if defined(AZ_ENABLE_TRACING)
                 if (message.m_assetType == AZ::Data::s_invalidAssetType)
                 {
-                    AZ_TracePrintf("AssetCatalog", "Registering asset \"%s\" via AssetSystem message, but type is not set.", relativePath.c_str());
+                    AZ_TracePrintf("AssetCatalog", "Registering asset \"%s\" via AssetSystem message, but type is not set.\n", relativePath.c_str());
                 }
     #endif
 

Code/Framework/AzFramework/AzFramework/Asset/AssetSystemComponentHelper.cpp

@@ -220,7 +220,7 @@ namespace AzFramework
             {
                 // Read the wait for connection boolean from the Settings Registry
                 AZ::s64 waitForConnect64{};
-                if (!AZ::SettingsRegistryMergeUtils::PlatformGet(*settingsRegistry, waitForConnect64, AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey, AzFramework::AssetSystem::WaitForConnect))
+                if (AZ::SettingsRegistryMergeUtils::PlatformGet(*settingsRegistry, waitForConnect64, AZ::SettingsRegistryMergeUtils::BootstrapSettingsRootKey, AzFramework::AssetSystem::WaitForConnect))
                 {
                     outputConnectionSettings.m_waitForConnect = waitForConnect64 != 0;
                 }

Code/Framework/AzFramework/AzFramework/Components/AzFrameworkConfigurationSystemComponent.cpp

@@ -17,7 +17,7 @@
 #include <AzCore/RTTI/BehaviorContext.h>
 #include <AzCore/Debug/Trace.h>
 #include <AzFramework/Scene/Scene.h>
-#include <AzFramework/Scene/SceneSystemBus.h>
+#include <AzFramework/Scene/SceneSystemInterface.h>
 #include <AzFramework/Entity/GameEntityContextComponent.h>
 
 namespace AzFramework
@@ -50,36 +50,34 @@ namespace AzFramework
 
     void AzFrameworkConfigurationSystemComponent::Activate()
     {
-        // Create the defaults scene and associate the GameEntityContext with it.
-        AZ::Outcome<Scene*, AZStd::string> createSceneOutcome = AZ::Failure<AZStd::string>("SceneSystemRequests bus not responding.");
-        SceneSystemRequestBus::BroadcastResult(createSceneOutcome, &AzFramework::SceneSystemRequests::CreateScene, "default");
+        AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> createSceneOutcome =
+            SceneSystemInterface::Get()->CreateScene(Scene::MainSceneName);
         if (createSceneOutcome)
         {
-            Scene* scene = createSceneOutcome.GetValue();
-            bool success = false;
-            EntityContextId gameEntityContextId = EntityContextId::CreateNull();
-            GameEntityContextRequestBus::BroadcastResult(gameEntityContextId, &GameEntityContextRequests::GetGameEntityContextId);
-
-            if (!gameEntityContextId.IsNull())
+            AZStd::shared_ptr<Scene> scene = createSceneOutcome.TakeValue();
+            EntityContext* gameEntityContext = nullptr;
+            GameEntityContextRequestBus::BroadcastResult(gameEntityContext, &GameEntityContextRequests::GetGameEntityContextInstance);
+            if (gameEntityContext != nullptr)
             {
-                SceneSystemRequestBus::BroadcastResult(success, &AzFramework::SceneSystemRequests::SetSceneForEntityContextId, gameEntityContextId, scene);
+                [[maybe_unused]] bool result = scene->SetSubsystem<EntityContext::SceneStorageType&>(gameEntityContext);
+                AZ_Assert(result, "Unable to register main entity context with the main scene.");
+            }
+            else
+            {
+                AZ_Assert(false, "Unable to retrieve the game entity context instance.");
             }
-            AZ_Assert(success, "The application was unable to setup a scene for the game entity context, this should always work");
         }
         else
         {
-            AZ_Assert(false, "%s", createSceneOutcome.GetError().data());
+            AZ_Assert(false, "Unable to create main scene due to: %s", createSceneOutcome.GetError().c_str());
         }
 
     }
 
     void AzFrameworkConfigurationSystemComponent::Deactivate()
     {
-        bool success = false;
-        SceneSystemRequestBus::BroadcastResult(
-            success, &AzFramework::SceneSystemRequestBus::Events::RemoveScene, "default");
-
-        AZ_Assert(success, "\"default\" scene was not removed");
+        [[maybe_unused]] bool success = SceneSystemInterface::Get()->RemoveScene(Scene::MainSceneName);
+        AZ_Assert(success, "Unable to remove the main scene.");
     }
 
     void AzFrameworkConfigurationSystemComponent::GetProvidedServices(AZ::ComponentDescriptor::DependencyArrayType& provided)

Code/Framework/AzFramework/AzFramework/Entity/EntityContext.cpp

@@ -18,6 +18,8 @@
 #include <AzCore/Component/TickBus.h>
 #include <AzCore/Debug/Profiler.h>
 #include <AzCore/std/containers/stack.h>
+#include <AzFramework/Scene/Scene.h>
+#include <AzFramework/Scene/SceneSystemInterface.h>
 
 #include "EntityContext.h"
 
@@ -37,6 +39,30 @@ namespace AzFramework
         }
     }
 
+    AZStd::shared_ptr<Scene> EntityContext::FindContainingScene(const EntityContextId& contextId)
+    {
+        auto sceneSystem = SceneSystemInterface::Get();
+        AZ_Assert(sceneSystem, "Attempting to retrieve the scene containing a entity context before the scene system is available.");
+
+        AZStd::shared_ptr<Scene> result;
+        sceneSystem->IterateActiveScenes([&result, &contextId](const AZStd::shared_ptr<Scene>& scene)
+            {
+                EntityContext** entityContext = scene->FindSubsystemInScene<EntityContext::SceneStorageType>();
+                if (entityContext && (*entityContext)->GetContextId() == contextId)
+                {
+                    result = scene;
+                    // Result found, returning.
+                    return false;
+                }
+                else
+                {
+                    // No match, continuing to search for containing scene.
+                    return true;
+                }
+            });
+        return result;
+    }
+
     //=========================================================================
     // EntityContext ctor
     //=========================================================================

Code/Framework/AzFramework/AzFramework/Entity/EntityContext.h

@@ -17,6 +17,7 @@
 #include <AzCore/Component/EntityBus.h>
 #include <AzCore/Serialization/ObjectStream.h>
 #include <AzCore/Serialization/IdUtils.h>
+#include <AzCore/std/smart_ptr/shared_ptr.h>
 #include <AzFramework/Entity/EntityContextBus.h>
 #include <AzFramework/Entity/SliceEntityOwnershipService.h>
 
@@ -27,7 +28,7 @@ namespace AZ
 
 namespace AzFramework
 {
-    class EntityContext;
+    class Scene;
 
     /**
      * Provides services for a group of entities under the umbrella of a given context.
@@ -47,9 +48,11 @@ namespace AzFramework
         , public EntityOwnershipServiceNotificationBus::Handler
     {
     public:
-
         AZ_TYPE_INFO(EntityContext, "{4F98A6B9-C7B5-450E-8A8A-30EEFC411EF5}");
 
+        /// The type used to store entity in AzFramework::Scene.
+        using SceneStorageType = EntityContext*;
+
         EntityContext(AZ::SerializeContext* serializeContext = nullptr);
         EntityContext(const EntityContextId& contextId, AZ::SerializeContext* serializeContext = nullptr);
         EntityContext(const EntityContextId& contextId, AZStd::unique_ptr<EntityOwnershipService> entityOwnershipService,
@@ -75,6 +78,7 @@ namespace AzFramework
         //////////////////////////////////////////////////////////////////////////
 
         static void Reflect(AZ::ReflectContext* context);
+        static AZStd::shared_ptr<Scene> FindContainingScene(const EntityContextId& contextId);
 
     protected:
 

Code/Framework/AzFramework/AzFramework/Entity/GameEntityContextBus.h

@@ -66,6 +66,8 @@ namespace AzFramework
          */
         virtual EntityContextId GetGameEntityContextId() = 0;
 
+        virtual EntityContext* GetGameEntityContextInstance() = 0;
+
         /**
          * Creates an entity in the game context.
          * @param name A name for the new entity.

Code/Framework/AzFramework/AzFramework/Entity/GameEntityContextComponent.h

@@ -51,6 +51,7 @@ namespace AzFramework
         //////////////////////////////////////////////////////////////////////////
         // GameEntityContextRequestBus
         AZ::Uuid GetGameEntityContextId() override { return GetContextId(); }
+        EntityContext* GetGameEntityContextInstance() override { return this; }
         void ResetGameContext() override;
         AZ::Entity* CreateGameEntity(const char* name) override;
         BehaviorEntity CreateGameEntityForBehaviorContext(const char* name) override;

Code/Framework/AzFramework/AzFramework/FileTag/FileTag.cpp

@@ -12,11 +12,13 @@
 
 #include <AzCore/Serialization/Utils.h>
 #include <AzCore/IO/FileIO.h>
+#include <AzCore/IO/Path/Path.h>
 #include <AzCore/IO/SystemFile.h>
 #include <AzCore/std/algorithm.h>
 #include <AzCore/std/string/wildcard.h>
 #include <AzCore/std/string/regex.h>
 #include <AzCore/std/string/conversions.h>
+#include <AzCore/Utils/Utils.h>
 #include <AzCore/XML/rapidxml.h>
 #include <AzFramework/API/ApplicationAPI.h>
 #include <AzFramework/Asset/FileTagAsset.h>
@@ -31,7 +33,7 @@ namespace AzFramework
         const char* ExcludeFileName = "exclude";
         const char* IncludeFileName = "include";
         const char* FileTags[] = { "ignore", "error", "productdependency", "editoronly", "shader" };
-        const char EngineName[] = "Engine";
+        constexpr AZ::IO::PathView EngineAssetSourceRelPath = "Assets/Engine";
 
         void LowerCaseFileTags(AZStd::vector<AZStd::string>& fileTags)
         {
@@ -107,7 +109,7 @@ namespace AzFramework
         }
 
         AZ::Outcome<AZStd::string, AZStd::string> FileTagManager::AddTagsInternal(AZStd::string filePath, FileTagType fileTagType, AZStd::vector<AZStd::string> fileTags, AzFramework::FileTag::FilePatternType filePatternType)
-        {   
+        {
             if (!NormalizeFileAndLowerCaseTags(filePath, filePatternType, fileTags))
             {
                 return AZ::Failure(AZStd::string::format("Unable to normalize file (%s). Unable to remove the file.\n", filePath.c_str()));
@@ -243,11 +245,10 @@ namespace AzFramework
 
         AZStd::string FileTagQueryManager::GetDefaultFileTagFilePath(FileTagType fileTagType)
         {
-            AZStd::string destinationFilePath;
-            const char* engineRoot = nullptr;
-            AzFramework::ApplicationRequests::Bus::BroadcastResult(engineRoot, &AzFramework::ApplicationRequests::GetEngineRoot);
-            AzFramework::StringFunc::Path::ConstructFull(engineRoot, EngineName, fileTagType == FileTagType::Exclude ? ExcludeFileName : IncludeFileName, AzFramework::FileTag::FileTagAsset::Extension(), destinationFilePath, true);
-            return destinationFilePath;
+            auto destinationFilePath = AZ::IO::FixedMaxPath(AZ::Utils::GetEnginePath()) / EngineAssetSourceRelPath;
+            destinationFilePath /= fileTagType == FileTagType::Exclude ? ExcludeFileName : IncludeFileName;
+            destinationFilePath.ReplaceExtension(AzFramework::FileTag::FileTagAsset::Extension());
+            return destinationFilePath.String();
         }
 
         bool FileTagQueryManager::Load(const AZStd::string& filePath)

Code/Framework/AzFramework/AzFramework/Network/NetBindingComponent.cpp

@@ -44,8 +44,8 @@ namespace AzFramework
                     "Network Binding", "The Network Binding component marks an entity as able to be replicated across the network")
                     ->ClassElement(AZ::Edit::ClassElements::EditorData, "")
                         ->Attribute(AZ::Edit::Attributes::Category, "Networking")
-                        ->Attribute(AZ::Edit::Attributes::Icon, "Editor/Icons/Components/NetBinding.svg")
-                        ->Attribute(AZ::Edit::Attributes::ViewportIcon, "Editor/Icons/Components/Viewport/NetBinding.png")
+                        ->Attribute(AZ::Edit::Attributes::Icon, "Icons/Components/NetBinding.svg")
+                        ->Attribute(AZ::Edit::Attributes::ViewportIcon, "Icons/Components/Viewport/NetBinding.png")
                         ->Attribute(AZ::Edit::Attributes::HelpPageURL, "https://docs.aws.amazon.com/lumberyard/latest/userguide/component-network-binding.html")
                         ->Attribute(AZ::Edit::Attributes::AppearsInAddComponentMenu, AZ_CRC("Game", 0x232b318c));
             }

Code/Framework/AzFramework/AzFramework/ProjectManager/ProjectManager.cpp

@@ -41,9 +41,10 @@ namespace AzFramework::ProjectManager
             // at the end of the function
             AZ::CommandLine commandLine;
             commandLine.Parse(argc, argv);
-            AZ::SettingsRegistryImpl settingsRegistry;
-            // Store the Command line to the Setting Registry
+            AZ::SettingsRegistryMergeUtils::ParseCommandLine(commandLine);
 
+            // Store the Command line to the Setting Registry
+            AZ::SettingsRegistryImpl settingsRegistry;
             AZ::SettingsRegistryMergeUtils::StoreCommandLineToRegistry(settingsRegistry, commandLine);
             AZ::SettingsRegistryMergeUtils::MergeSettingsToRegistry_Bootstrap(settingsRegistry);
             AZ::SettingsRegistryMergeUtils::MergeSettingsToRegistry_O3deUserRegistry(settingsRegistry, AZ_TRAIT_OS_PLATFORM_CODENAME, {});
@@ -68,7 +69,14 @@ namespace AzFramework::ProjectManager
         // If we were able to locate a path to a project, we're done
         if (!projectRootPath.empty())
         {
-            return ProjectPathCheckResult::ProjectPathFound;
+            AZ::IO::FixedMaxPath projectJsonPath = engineRootPath / projectRootPath / "project.json";
+            if (AZ::IO::SystemFile::Exists(projectJsonPath.c_str()))
+            {
+                return ProjectPathCheckResult::ProjectPathFound;
+            }
+            AZ_TracePrintf(
+                "ProjectManager", "Did not find a project file at location '%s', launching the Project Manager...",
+                projectJsonPath.c_str());
         }
 
         if (LaunchProjectManager(engineRootPath))

Code/Framework/AzFramework/AzFramework/Render/Intersector.cpp

@@ -14,9 +14,9 @@
 #include <AzCore/std/algorithm.h>
 #include <AzCore/std/sort.h>
 
+#include <AzFramework/Entity/EntityContext.h>
 #include <AzFramework/Render/Intersector.h>
 #include <AzFramework/Scene/Scene.h>
-#include <AzFramework/Scene/SceneSystemBus.h>
 #include <AzFramework/Visibility/BoundsBus.h>
 
 #include <algorithm>
@@ -30,11 +30,11 @@ namespace AzFramework
         {
             IntersectorBus::Handler::BusConnect(m_contextId);
             IntersectionNotificationBus::Handler::BusConnect(m_contextId);
-            Scene* scene = nullptr;
-            SceneSystemRequestBus::BroadcastResult(scene, &AzFramework::SceneSystemRequestBus::Events::GetSceneFromEntityContextId, m_contextId);
+
+            AZStd::shared_ptr<Scene> scene = EntityContext::FindContainingScene(m_contextId);
             if (scene)
             {
-                scene->SetSubsystem<IntersectorInterface>(this);
+                scene->SetSubsystem(this);
             }
         }
 
@@ -42,11 +42,12 @@ namespace AzFramework
         {
             IntersectorBus::Handler::BusDisconnect();
             IntersectionNotificationBus::Handler::BusDisconnect();
-            Scene* scene = nullptr;
-            SceneSystemRequestBus::BroadcastResult(scene, &AzFramework::SceneSystemRequestBus::Events::GetSceneFromEntityContextId, m_contextId);
+
+            AZStd::shared_ptr<Scene> scene = EntityContext::FindContainingScene(m_contextId);
             if (scene)
             {
-                scene->UnsetSubsystem<IntersectorInterface>();
+                [[maybe_unused]] bool result = scene->UnsetSubsystem(this);
+                AZ_Assert(result, "Failed to unregister Intersector with scene");
             }
         }
 

Code/Framework/AzFramework/AzFramework/Render/Intersector.h

@@ -33,6 +33,8 @@ namespace AzFramework
             , protected IntersectionNotificationBus::Handler
         {
         public:
+            AZ_TYPE_INFO(AzFramework::RenderGeometry::Intersector, "{4CCA7971-CD83-4856-ADEA-89CEB41FB197}");
+
             Intersector(AzFramework::EntityContextId contextId);
             ~Intersector();
 

Code/Framework/AzFramework/AzFramework/Scene/Scene.cpp

@@ -14,13 +14,102 @@
 
 namespace AzFramework
 {
-    Scene::Scene(AZStd::string_view name)
-        : m_name(name)
+    Scene::Scene(AZStd::string name)
+        : m_name(AZStd::move(name))
     {
     }
 
-    const AZStd::string& Scene::GetName()
+    Scene::Scene(AZStd::string name, AZStd::shared_ptr<Scene> parent)
+        : m_name(AZStd::move(name))
+        , m_parent(AZStd::move(parent))
+    {
+    }
+
+    Scene::~Scene()
+    {
+        m_removalEvent.Signal(*this, RemovalEventType::Destroyed);
+    }
+
+    const AZStd::string& Scene::GetName() const
     {
         return m_name;
     }
+
+    const AZStd::shared_ptr<Scene>& Scene::GetParent()
+    {
+        return m_parent;
+    }
+
+    AZStd::shared_ptr<const Scene> Scene::GetParent() const
+    {
+        return m_parent;
+    }
+
+    bool Scene::IsAlive() const
+    {
+        return m_isAlive;
+    }
+
+    void Scene::ConnectToEvents(RemovalEvent::Handler& handler)
+    {
+        handler.Connect(m_removalEvent);
+    }
+
+    void Scene::ConnectToEvents(SubsystemEvent::Handler& handler)
+    {
+        handler.Connect(m_subsystemEvent);
+    }
+
+    AZStd::any* Scene::FindSubsystem(const AZ::TypeId& typeId)
+    {
+        AZStd::any* result = FindSubsystemInScene(typeId);
+        return (!result && m_parent) ? m_parent->FindSubsystem(typeId) : result;
+    }
+
+    const AZStd::any* Scene::FindSubsystem(const AZ::TypeId& typeId) const
+    {
+        return const_cast<Scene*>(this)->FindSubsystem(typeId);
+    }
+
+    AZStd::any* Scene::FindSubsystemInScene(const AZ::TypeId& typeId)
+    {
+        // Spot check that the internal arrays remain consistent.
+        AZ_Assert(
+            m_systemKeys.size() == m_systemObjects.size(), "Key and object list in AzFramework::Scene '%s' have gone out of sync.",
+            m_name.c_str());
+
+        const size_t m_systemKeysCount = m_systemKeys.size();
+        for (size_t i = 0; i < m_systemKeysCount; ++i)
+        {
+            if (m_systemKeys[i] != typeId)
+            {
+                continue;
+            }
+            else
+            {
+                return &m_systemObjects[i];
+            }
+        }
+        return nullptr;
+    }
+
+    const AZStd::any* Scene::FindSubsystemInScene(const AZ::TypeId& typeId) const
+    {
+        return const_cast<Scene*>(this)->FindSubsystemInScene(typeId);
+    }
+
+    void Scene::MarkForDestruction()
+    {
+        m_isAlive = false;
+        m_removalEvent.Signal(*this, RemovalEventType::Zombified);
+    }
+
+    void Scene::RemoveSubsystem(size_t index, const AZ::TypeId& subsystemType)
+    {
+        m_systemKeys[index] = m_systemKeys.back();
+        m_systemObjects[index] = AZStd::move(m_systemObjects.back());
+        m_systemKeys.pop_back();
+        m_systemObjects.pop_back();
+        m_subsystemEvent.Signal(*this, SubsystemEventType::Removed, subsystemType);
+    }
 }

Code/Framework/AzFramework/AzFramework/Scene/Scene.h

@@ -11,10 +11,14 @@
  */
 #pragma once
 
+#include <AzCore/EBus/Event.h>
 #include <AzCore/RTTI/RTTI.h>
 #include <AzCore/std/string/string.h>
 #include <AzCore/Memory/SystemAllocator.h>
+#include <AzCore/std/any.h>
 #include <AzCore/std/containers/vector.h>
+#include <AzCore/std/smart_ptr/shared_ptr.h>
+#include <AzCore/std/string/string_view.h>
 
 namespace AzFramework
 {
@@ -24,71 +28,100 @@ namespace AzFramework
         AZ_TYPE_INFO(Scene, "{DB449BB3-7A95-434D-BC61-47ACBB1F3436}");
         AZ_CLASS_ALLOCATOR(Scene, AZ::SystemAllocator, 0);
 
-        explicit Scene(AZStd::string_view name);
+        friend class ISceneSystem;
 
-        const AZStd::string& GetName();
+        constexpr static AZStd::string_view MainSceneName = "Main";
+        constexpr static AZStd::string_view EditorMainSceneName = "Editor";
+
+        enum class RemovalEventType
+        {
+            Zombified, // The scene has be marked for destruction and is no longer visible in the scene system.
+            Destroyed, // The scene has been destroyed.
+        };
+        using RemovalEvent = AZ::Event<Scene&, RemovalEventType>;
+        enum class SubsystemEventType
+        {
+            Added,
+            Removed
+        };
+        using SubsystemEvent = AZ::Event<Scene&, SubsystemEventType, const AZ::TypeId&>;
+
+        explicit Scene(AZStd::string name);
+        Scene(AZStd::string name, AZStd::shared_ptr<Scene> parent);
+        ~Scene();
+
+        [[nodiscard]] const AZStd::string& GetName() const;
+
+        [[nodiscard]] const AZStd::shared_ptr<Scene>& GetParent();
+        [[nodiscard]] AZStd::shared_ptr<const Scene> GetParent() const;
+
+        [[nodiscard]] bool IsAlive() const;
+
+        void ConnectToEvents(RemovalEvent::Handler& handler);
+        void ConnectToEvents(SubsystemEvent::Handler& handler);
         
         // Set the instance of a subsystem associated with this scene.
         template <typename T>
-        bool SetSubsystem(T* system);
+        bool SetSubsystem(T&& system);
 
         // Unset the instance of a subsystem associated with this scene.
         template <typename T>
         bool UnsetSubsystem();
 
-        // Get the instance of a subsystem associated with this scene.
+        // Unset the instance of the exact system associated with this scene.
+        // Use this to make sure the expected instance is removed or to make sure type deduction is done in the same way as during setting.
+        template<typename T>
+        bool UnsetSubsystem(const T& system);
+
+        // Get the instance of a subsystem associated with this scene. This call will also look in parent scenes if not found on the target
+        // scene. Returns a pointer to the subsystem if found, otherwise returns a nullptr.
+        [[nodiscard]] AZStd::any* FindSubsystem(const AZ::TypeId& typeId);
+        // Get the instance of a subsystem associated with this scene. This call will also look in parent scenes if not found on the target
+        // scene. Returns a pointer to the subsystem if found, otherwise returns a nullptr.
+        [[nodiscard]] const AZStd::any* FindSubsystem(const AZ::TypeId& typeId) const;
+        // Get the instance of a subsystem associated with this scene. This call will also look in parent scenes if not found on the target
+        // scene. Returns a pointer to the subsystem if found, otherwise returns a nullptr.
         template <typename T>
-        T* GetSubsystem();
+        [[nodiscard]] T* FindSubsystem();
+        // Get the instance of a subsystem associated with this scene. This call will also look in parent scenes if not found on the target
+        // scene. Returns a pointer to the subsystem if found, otherwise returns a nullptr.
+        template<typename T>
+        [[nodiscard]] const T* FindSubsystem() const;
+
+        // Get the instance of a subsystem associated with this scene. This call will only look in the selected scene. Returns a pointer to
+        // the subsystem if found, otherwise returns a nullptr.
+        [[nodiscard]] AZStd::any* FindSubsystemInScene(const AZ::TypeId& typeId);
+        // Get the instance of a subsystem associated with this scene. This call will only look in the selected scene. Returns a pointer to
+        // the subsystem if found, otherwise returns a nullptr.
+        [[nodiscard]] const AZStd::any* FindSubsystemInScene(const AZ::TypeId& typeId) const;
+        // Get the instance of a subsystem associated with this scene. This call will only look in the selected scene. Returns a pointer to
+        // the subsystem if found, otherwise returns a nullptr.
+        template<typename T>
+        [[nodiscard]] T* FindSubsystemInScene();
+        // Get the instance of a subsystem associated with this scene. This call will only look in the selected scene. Returns a pointer to
+        // the subsystem if found, otherwise returns a nullptr.
+        template<typename T>
+        [[nodiscard]] const T* FindSubsystemInScene() const;
 
     private:
+        void MarkForDestruction();
+        void RemoveSubsystem(size_t index, const AZ::TypeId& subsystemType);
 
-        AZStd::string m_name;
+        RemovalEvent m_removalEvent;
+        SubsystemEvent m_subsystemEvent;
 
         // Storing keys separate from data to optimize for fast key search.
         AZStd::vector<AZ::TypeId> m_systemKeys;
-        AZStd::vector<void*> m_systemPointers;
+        AZStd::vector<AZStd::any> m_systemObjects;
+
+        // Name that identifies the scene.
+        AZStd::string m_name;
+        // Parent to this scene. Any subsystems are inherited from the parent but can be overwritten locally.
+        AZStd::shared_ptr<Scene> m_parent;
+        // If false, the scene has been removed from scene system and can no longer be found. As soon as all handles to the scene are
+        // released it will be destroyed.
+        bool m_isAlive{ true };
     };
-    
-    template <typename T>
-    bool Scene::SetSubsystem(T* system)
-    {
-        if (GetSubsystem<T>() != nullptr)
-        {
-            return false;
-        }
-        m_systemKeys.push_back(T::RTTI_Type());
-        m_systemPointers.push_back(system);
-        return true;
-    }
-
-    template <typename T>
-    bool Scene::UnsetSubsystem()
-    {
-        for (size_t i = 0; i < m_systemKeys.size(); ++i)
-        {
-            if (m_systemKeys.at(i) == T::RTTI_Type())
-            {
-                m_systemKeys.at(i) = m_systemKeys.back();
-                m_systemKeys.pop_back();
-                m_systemPointers.at(i) = m_systemPointers.back();
-                m_systemPointers.pop_back();
-                return true;
-            }
-        }
-        return false;
-    }
-
-    template <typename T>
-    T* Scene::GetSubsystem()
-    {
-        for (size_t i = 0; i < m_systemKeys.size(); ++i)
-        {
-            if (m_systemKeys.at(i) == T::RTTI_Type())
-            {
-                return reinterpret_cast<T*>(m_systemPointers.at(i));
-            }
-        }
-        return nullptr;
-    }
-
 } // AzFramework
+
+#include <AzFramework/Scene/Scene.inl>

Code/Framework/AzFramework/AzFramework/Scene/Scene.inl

@@ -0,0 +1,108 @@
+/*
+ * All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+ * its licensors.
+ *
+ * For complete copyright and license terms please see the LICENSE at the root of this
+ * distribution (the "License"). All use of this software is governed by the License,
+ * or, if provided, by the license below or the license accompanying this file. Do not
+ * remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *
+ */
+
+namespace AzFramework
+{
+    template<typename T>
+    bool Scene::SetSubsystem(T&& system)
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        for (const AZ::TypeId& key : m_systemKeys)
+        {
+            if (key == targetType)
+            {
+                return false;
+            }
+        }
+
+        m_systemKeys.push_back(targetType);
+        m_systemObjects.emplace_back(AZStd::forward<T>(system));
+        m_subsystemEvent.Signal(*this, SubsystemEventType::Added, targetType);
+        return true;
+    }
+
+    template<typename T>
+    bool Scene::UnsetSubsystem()
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        const size_t m_systemKeysCount = m_systemKeys.size();
+        for (size_t i = 0; i < m_systemKeysCount; ++i)
+        {
+            if (m_systemKeys[i] != targetType)
+            {
+                continue;
+            }
+            else
+            {
+                RemoveSubsystem(i, targetType);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    template<typename T>
+    bool Scene::UnsetSubsystem(const T& system)
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        const size_t systemKeysCount = m_systemKeys.size();
+        for (size_t i = 0; i < systemKeysCount; ++i)
+        {
+            if (m_systemKeys[i] != targetType)
+            {
+                continue;
+            }
+            else
+            {
+                [[maybe_unused]] T* instance = AZStd::any_cast<T>(&m_systemObjects[i]);
+                AZ_Assert(
+                    instance && *instance == system,
+                    "Subsystem being released matched type, but wasn't pointing to the same system that was stored.");
+                RemoveSubsystem(i, targetType);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    template<typename T>
+    T* Scene::FindSubsystem()
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        AZStd::any* subSystem = FindSubsystem(targetType);
+        return subSystem ? AZStd::any_cast<T>(subSystem) : nullptr;
+    }
+
+    template<typename T>
+    const T* Scene::FindSubsystem() const
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        const AZStd::any* subSystem = FindSubsystem(targetType);
+        return subSystem ? AZStd::any_cast<const T>(subSystem) : nullptr;
+    }
+
+    template<typename T>
+    T* Scene::FindSubsystemInScene()
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        AZStd::any* subSystem = FindSubsystemInScene(targetType);
+        return subSystem ? AZStd::any_cast<T>(subSystem) : nullptr;
+    }
+
+    template<typename T>
+    const T* Scene::FindSubsystemInScene() const
+    {
+        const AZ::TypeId& targetType = azrtti_typeid<T>();
+        const AZStd::any* subSystem = FindSubsystemInScene(targetType);
+        return subSystem ? AZStd::any_cast<const T>(subSystem) : nullptr;
+    }
+} // namespace AzFramework

Code/Framework/AzFramework/AzFramework/Scene/SceneSystemBus.h

@@ -1,114 +0,0 @@
-/*
- * All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
- * its licensors.
- *
- * For complete copyright and license terms please see the LICENSE at the root of this
- * distribution (the "License"). All use of this software is governed by the License,
- * or, if provided, by the license below or the license accompanying this file. Do not
- * remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *
- */
-#pragma once
-
-#include <AzCore/EBus/EBus.h>
-#include <AzFramework/Entity/EntityContext.h>
-
-namespace AzFramework
-{
-    // Forward declarations
-    class Scene;
-
-    //! Interface used to create, get, or destroy scenes.
-    class SceneSystemRequests
-        : public AZ::EBusTraits
-    {
-    public:
-
-        virtual ~SceneSystemRequests() = default;
-
-        //! Single handler policy since there should only be one instance of this system component.
-        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Single;
-
-        //! Creates a scene with a given name.
-        //!  - If there is already a scene with the provided name this will return AZ::Failure(). 
-        //!  - If isDefault is set to true and there is already a default scene, the default scene will be switched to this one. 
-        virtual AZ::Outcome<Scene*, AZStd::string> CreateScene(AZStd::string_view name) = 0;
-
-        //! Gets a scene with a given name
-        //!  - If a scene does not exist with the given name, nullptr is returned.
-        virtual Scene* GetScene(AZStd::string_view name) = 0;
-
-        //! Gets all the scenes that currently exist.
-        virtual AZStd::vector<Scene*> GetAllScenes() = 0;
-
-        //! Remove a scene with a given name and return if the operation was successful.
-        //!  - If the removed scene is the default scene, there will no longer be a default scene.
-        virtual bool RemoveScene(AZStd::string_view name) = 0;
-
-        //! Add a mapping from the provided EntityContextId to a Scene
-        //! - If a scene is already associated with this EntityContextId, nothing is changed and false is returned.
-        virtual bool SetSceneForEntityContextId(EntityContextId entityContextId, Scene* scene) = 0;
-
-        //! Remove a mapping from the provided EntityContextId to a Scene
-        //!  - If no scene is found from the provided EntityContextId, false is returned.
-        virtual bool RemoveSceneForEntityContextId(EntityContextId entityContextId, Scene* scene) = 0;
-
-        //! Get the scene associated with an EntityContextId
-        //!  - If no scene is found for the provided EntityContextId, nullptr is returned.
-        virtual Scene* GetSceneFromEntityContextId(EntityContextId entityContextId) = 0;
-    };
-
-    using SceneSystemRequestBus = AZ::EBus<SceneSystemRequests>;
-
-    //! Interface used for notifications from the scene system
-    class SceneSystemNotifications
-        : public AZ::EBusTraits
-    {
-    public:
-
-        virtual ~SceneSystemNotifications() = default;
-
-        //! There can be multiple listeners to changes in the scene system.
-        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
-
-        //! Called when a scene has been created.
-        virtual void SceneCreated(Scene& /*scene*/) {};
-
-        //! Called just before a scene is removed.
-        virtual void SceneAboutToBeRemoved(Scene& /*scene*/) {};
-
-    };
-
-    using SceneSystemNotificationBus = AZ::EBus<SceneSystemNotifications>;
-
-    //! Interface used for notifications about individual scenes
-    class SceneNotifications
-        : public AZ::EBusTraits
-    {
-    public:
-
-        virtual ~SceneNotifications() = default;
-
-        //! There can be multiple listeners to changes in the scene system.
-        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
-
-        //! Bus is listened to using the pointer of the scene
-        static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::ById;
-
-        //! Specifies that events are addressed by the pointer to the scene
-        using BusIdType = Scene*;
-
-        //! Called just before a scene is removed.
-        virtual void SceneAboutToBeRemoved() {};
-
-        //! Called when an entity context is mapped to this scene.
-        virtual void EntityContextMapped(EntityContextId /*entityContextId*/) {};
-
-        //! Called when an entity context is unmapped from this scene.
-        virtual void EntityContextUnmapped(EntityContextId /*entityContextId*/) {};
-    };
-
-    using SceneNotificationBus = AZ::EBus<SceneNotifications>;
-
-} // AzFramework

Code/Framework/AzFramework/AzFramework/Scene/SceneSystemComponent.cpp

@@ -14,7 +14,7 @@
 
 #include <AzCore/Serialization/SerializeContext.h>
 #include <AzCore/Serialization/EditContext.h>
-#include <AzFramework/Scene/Scene.h>
+#include <AzCore/std/smart_ptr/make_shared.h>
 
 namespace AzFramework
 {
@@ -41,14 +41,10 @@ namespace AzFramework
 
     void SceneSystemComponent::Activate()
     {
-        // Connect busses
-        SceneSystemRequestBus::Handler::BusConnect();
     }
 
     void SceneSystemComponent::Deactivate()
     {
-        // Disconnect Busses
-        SceneSystemRequestBus::Handler::BusDisconnect();
     }
 
     void SceneSystemComponent::GetProvidedServices(AZ::ComponentDescriptor::DependencyArrayType& provided)
@@ -61,140 +57,105 @@ namespace AzFramework
         incompatible.push_back(AZ_CRC("SceneSystemComponentService", 0xd8975435));
     }
 
-    AZ::Outcome<Scene*, AZStd::string> SceneSystemComponent::CreateScene(AZStd::string_view name)
+    AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> SceneSystemComponent::CreateScene(AZStd::string_view name)
     {
-        Scene* existingScene = GetScene(name);
+        return CreateSceneWithParent(name, nullptr);
+    }
 
+    AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> SceneSystemComponent::CreateSceneWithParent(
+        AZStd::string_view name, AZStd::shared_ptr<Scene> parent)
+    {
+        const AZStd::shared_ptr<Scene>& existingScene = GetScene(name);
         if (existingScene)
         {
             return AZ::Failure<AZStd::string>("A scene already exists with this name.");
         }
 
-        auto newScene = AZStd::make_unique<Scene>(name);
-        Scene* scenePointer = newScene.get();
-        m_scenes.push_back(AZStd::move(newScene));
-        SceneSystemNotificationBus::Broadcast(&SceneSystemNotificationBus::Events::SceneCreated, *scenePointer);
-        return AZ::Success(scenePointer);
+        auto newScene = AZStd::make_shared<Scene>(name, AZStd::move(parent));
+        m_activeScenes.push_back(newScene);
+        {
+            AZStd::lock_guard lock(m_eventMutex);
+            m_events.Signal(EventType::SceneCreated, newScene);
+        }
+        return AZ::Success(AZStd::move(newScene));
     }
 
-    Scene* SceneSystemComponent::GetScene(AZStd::string_view name)
+    AZStd::shared_ptr<Scene> SceneSystemComponent::GetScene(AZStd::string_view name)
     {
-        auto sceneIterator = AZStd::find_if(m_scenes.begin(), m_scenes.end(),
+        auto sceneIterator = AZStd::find_if(m_activeScenes.begin(), m_activeScenes.end(),
             [name](auto& scene) -> bool
             {
                 return scene->GetName() == name;
             }
         );
 
-        return sceneIterator == m_scenes.end() ? nullptr : sceneIterator->get();
+        return sceneIterator == m_activeScenes.end() ? nullptr : *sceneIterator;
     }
 
-    AZStd::vector<Scene*> SceneSystemComponent::GetAllScenes()
+    void SceneSystemComponent::IterateActiveScenes(const ActiveIterationCallback& callback)
     {
-        AZStd::vector<Scene*> scenes;
-        scenes.resize_no_construct(m_scenes.size());
-
-        for (size_t i = 0; i < m_scenes.size(); ++i)
+        bool keepGoing = true;
+        auto end = m_activeScenes.end();
+        for (auto it = m_activeScenes.begin(); it != end && keepGoing; ++it)
         {
-            scenes.at(i) = m_scenes.at(i).get();
+            keepGoing = callback(*it);
+        }
+    }
+
+    void SceneSystemComponent::IterateZombieScenes(const ZombieIterationCallback& callback)
+    {
+        bool keepGoing = true;
+        auto end = m_zombieScenes.end();
+        for (auto it = m_zombieScenes.begin(); it != end && keepGoing;)
+        {
+            if (!it->expired())
+            {
+                keepGoing = callback(*(it->lock()));
+                ++it;
+            }
+            else
+            {
+                *it = m_zombieScenes.back();
+                m_zombieScenes.pop_back();
+                end = m_zombieScenes.end();
+            }
         }
-        return scenes;
     }
 
     bool SceneSystemComponent::RemoveScene(AZStd::string_view name)
     {
-        for (size_t i = 0; i < m_scenes.size(); ++i)
+        for (AZStd::shared_ptr<Scene>& scene : m_activeScenes)
         {
-            auto& scenePtr = m_scenes.at(i);
-            if (scenePtr->GetName() == name)
+            if (scene->GetName() == name)
             {
-                // Remove any entityContext mappings.
-                Scene* scene = scenePtr.get();
-                for (auto entityContextScenePairIt = m_entityContextToScenes.begin(); entityContextScenePairIt != m_entityContextToScenes.end();)
+                MarkSceneForDestruction(*scene);
                 {
-                    AZStd::pair<EntityContextId, Scene*>& pair = *entityContextScenePairIt;
-                    if (pair.second == scene)
-                    {
-                        // swap and pop back.
-                        *entityContextScenePairIt = m_entityContextToScenes.back();
-                        m_entityContextToScenes.pop_back();
-                    }
-                    else
-                    {
-                        ++entityContextScenePairIt;
-                    }
+                    AZStd::lock_guard lock(m_eventMutex);
+                    m_events.Signal(EventType::ScenePendingRemoval, scene);
                 }
 
-                SceneSystemNotificationBus::Broadcast(&SceneSystemNotificationBus::Events::SceneAboutToBeRemoved, *scene);
-                SceneNotificationBus::Event(scene, &SceneNotificationBus::Events::SceneAboutToBeRemoved);
-
-                m_scenes.erase(&scenePtr);
+                // Zombies are weak pointers that are kept around for situations where there's a delay in deleting the scene. This can happen
+                // if there are outstanding calls like in-progress async calls or resources locked by hardware. A weak_ptr of the original
+                // scene is kept so the zombie scene can still be found through iteration as it may require additional calls such as Tick calls.
+                m_zombieScenes.push_back(scene);
+                scene = AZStd::move(m_activeScenes.back());
+                m_activeScenes.pop_back();
+                // The scene may not be held onto anymore, so check here to see if the previously added zombie can be released.
+                if (m_zombieScenes.back().expired())
+                {
+                    m_zombieScenes.pop_back();
+                }
                 return true;
             }
         }
 
-        AZ_Warning("SceneSystemComponent", false, "Attempting to remove scene name \"%.*s\", but that scene was not found.", static_cast<int>(name.size()), name.data());
+        AZ_Warning("SceneSystemComponent", false, R"(Attempting to remove scene name "%.*s", but that scene was not found.)", AZ_STRING_ARG(name));
         return false;
     }
 
-    bool SceneSystemComponent::SetSceneForEntityContextId(EntityContextId entityContextId, Scene* scene)
+    void SceneSystemComponent::ConnectToEvents(SceneEvent::Handler& handler)
     {
-        Scene* existingSceneForEntityContext = GetSceneFromEntityContextId(entityContextId);
-        if (existingSceneForEntityContext)
-        {
-            // This entity context is already mapped and must be unmapped explictely before it can be changed.
-            char entityContextIdString[EntityContextId::MaxStringBuffer];
-            entityContextId.ToString(entityContextIdString, sizeof(entityContextIdString));
-            AZ_Warning("SceneSystemComponent", false, "Failed to set a scene for entity context %s, scene is already set for that entity context.", entityContextIdString);
-
-            return false;
-        }
-        m_entityContextToScenes.emplace_back(entityContextId, scene);
-        SceneNotificationBus::Event(scene, &SceneNotificationBus::Events::EntityContextMapped, entityContextId);
-        return true;
+        AZStd::lock_guard lock(m_eventMutex);
+        handler.Connect(m_events);
     }
-
-    bool SceneSystemComponent::RemoveSceneForEntityContextId(EntityContextId entityContextId, Scene* scene)
-    {
-        if (!scene || entityContextId.IsNull())
-        {
-            return false;
-        }
-
-        for (auto entityContextScenePairIt = m_entityContextToScenes.begin(); entityContextScenePairIt != m_entityContextToScenes.end();)
-        {
-            AZStd::pair<EntityContextId, Scene*>& pair = *entityContextScenePairIt;
-            if (!(pair.first == entityContextId && pair.second == scene))
-            {
-                ++entityContextScenePairIt;
-            }
-            else
-            {
-                // swap and pop back.
-                *entityContextScenePairIt = m_entityContextToScenes.back();
-                m_entityContextToScenes.pop_back();
-
-                SceneNotificationBus::Event(scene, &SceneNotificationBus::Events::EntityContextUnmapped, entityContextId);
-                return true;
-            }
-        }
-
-        char entityContextIdString[EntityContextId::MaxStringBuffer];
-        entityContextId.ToString(entityContextIdString, sizeof(entityContextIdString));
-        AZ_Warning("SceneSystemComponent", false, "Failed to remove scene \"%.*s\" for entity context %s, entity context is not currently mapped to that scene.", static_cast<int>(scene->GetName().size()), scene->GetName().data(), entityContextIdString);
-        return false;
-    }
-
-    Scene* SceneSystemComponent::GetSceneFromEntityContextId(EntityContextId entityContextId)
-    {
-        for (AZStd::pair<EntityContextId, Scene*>& pair : m_entityContextToScenes)
-        {
-            if (pair.first == entityContextId)
-            {
-                return pair.second;
-            }
-        }
-        return nullptr;
-    }
-
-} // AzFramework
+} // namespace AzFramework

Code/Framework/AzFramework/AzFramework/Scene/SceneSystemComponent.h

@@ -13,18 +13,18 @@
 
 #include <AzCore/Component/Component.h>
 #include <AzCore/std/containers/map.h>
-#include <AzFramework/Scene/SceneSystemBus.h>
+#include <AzCore/std/parallel/mutex.h>
+#include <AzFramework/Scene/SceneSystemInterface.h>
 #include <AzFramework/Entity/EntityContext.h>
 
 namespace AzFramework
 {
     class SceneSystemComponent
         : public AZ::Component
-        , public SceneSystemRequestBus::Handler
+        , public SceneSystemInterface::Registrar
     {
     public:
-
-        AZ_COMPONENT(SceneSystemComponent, "{7AC53AF0-BE1A-437C-BE3E-4D6A998DA945}", AZ::Component);
+        AZ_COMPONENT(SceneSystemComponent, "{7AC53AF0-BE1A-437C-BE3E-4D6A998DA945}", AZ::Component, ISceneSystem);
 
         SceneSystemComponent();
         ~SceneSystemComponent() override;
@@ -41,24 +41,26 @@ namespace AzFramework
         static void GetIncompatibleServices(AZ::ComponentDescriptor::DependencyArrayType& incompatible);
 
         //////////////////////////////////////////////////////////////////////////
-        // SceneSystemRequestsBus::Handler
+        // SceneSystemInterface overrides
         //////////////////////////////////////////////////////////////////////////
-        AZ::Outcome<Scene*, AZStd::string> CreateScene(AZStd::string_view name) override;
-        Scene* GetScene(AZStd::string_view name) override;
-        AZStd::vector<Scene*> GetAllScenes() override;
+        AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> CreateScene(AZStd::string_view name) override;
+        AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> CreateSceneWithParent(
+            AZStd::string_view name, AZStd::shared_ptr<Scene> parent) override;
+        [[nodiscard]] AZStd::shared_ptr<Scene> GetScene(AZStd::string_view name) override;
+        void IterateActiveScenes(const ActiveIterationCallback& callback) override;
+        void IterateZombieScenes(const ZombieIterationCallback& callback) override;
         bool RemoveScene(AZStd::string_view name) override;
-        bool SetSceneForEntityContextId(EntityContextId entityContextId, Scene* scene) override;
-        bool RemoveSceneForEntityContextId(EntityContextId entityContextId, Scene* scene) override;
-        Scene* GetSceneFromEntityContextId(EntityContextId entityContextId) override;
+        void ConnectToEvents(SceneEvent::Handler& handler) override;
 
     private:
+        AZ_DISABLE_COPY_MOVE(SceneSystemComponent);
 
-        AZ_DISABLE_COPY(SceneSystemComponent);
-
-        // Container of scene in order of creation
-        AZStd::vector<AZStd::unique_ptr<Scene>> m_scenes;
-
-        // Map of entity context Ids to scenes. Using a vector because lookups will be common, but the size will be small.
-        AZStd::vector<AZStd::pair<EntityContextId, Scene*>> m_entityContextToScenes;
+        AZStd::vector<AZStd::shared_ptr<Scene>> m_activeScenes;
+        AZStd::vector<AZStd::weak_ptr<Scene>> m_zombieScenes;
+        // Using a mutex around the events as other threads may respond to a new/deleted scene by making
+        // local updates and unregistering themselves. Since Scene is single threaded, no updates (other
+        // then unregistering an event) should be done from other threads though.
+        AZStd::recursive_mutex m_eventMutex;
+        SceneEvent m_events;
     };
 }

Code/Framework/AzFramework/AzFramework/Scene/SceneSystemInterface.h

@@ -0,0 +1,88 @@
+/*
+ * All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+ * its licensors.
+ *
+ * For complete copyright and license terms please see the LICENSE at the root of this
+ * distribution (the "License"). All use of this software is governed by the License,
+ * or, if provided, by the license below or the license accompanying this file. Do not
+ * remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *
+ */
+#pragma once
+
+#include <AzCore/EBus/EBus.h>
+#include <AzCore/EBus/Event.h>
+#include <AzCore/Interface/Interface.h>
+#include <AzCore/std/smart_ptr/shared_ptr.h>
+#include <AzCore/std/functional.h>
+#include <AzFramework/Entity/EntityContext.h>
+#include <AzFramework/Scene/Scene.h>
+
+namespace AzFramework
+{
+    //! Interface used to create, get, or destroy scenes.
+    //! This interface is single thread and is intended to be called from a single thread, commonly the main thread. The exception
+    //! is connecting events, which is thread safe.
+    class ISceneSystem
+    {
+    public:
+        AZ_RTTI(AzFramework::ISceneSystem, "{DAE482A8-88AE-4BD3-8A5B-52D19A96E15F}");
+        AZ_DISABLE_COPY_MOVE(ISceneSystem);
+
+        enum class EventType
+        {
+            SceneCreated,
+            ScenePendingRemoval
+        };
+        using SceneEvent = AZ::Event<EventType, const AZStd::shared_ptr<Scene>&>;
+
+        ISceneSystem() = default;
+        virtual ~ISceneSystem() = default;
+
+        using ActiveIterationCallback = AZStd::function<bool(const AZStd::shared_ptr<Scene>& scene)>;
+        using ZombieIterationCallback = AZStd::function<bool(Scene& scene)>;
+
+        //! Creates a scene with a given name.
+        //!  - If there is already a scene with the provided name this will return AZ::Failure(). 
+        virtual AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> CreateScene(AZStd::string_view name) = 0;
+
+        //! Creates a scene with a given name and a parent.
+        //!  - If there is already a scene with the provided name this will return AZ::Failure().
+        virtual AZ::Outcome<AZStd::shared_ptr<Scene>, AZStd::string> CreateSceneWithParent(
+            AZStd::string_view name, AZStd::shared_ptr<Scene> parent) = 0;
+
+        //! Gets a scene with a given name
+        //!  - If a scene does not exist with the given name, nullptr is returned.
+        [[nodiscard]] virtual AZStd::shared_ptr<Scene> GetScene(AZStd::string_view name) = 0;
+
+        //! Iterates over all scenes that are in active use. Iteration stops if the callback returns false or all scenes have been listed.
+        virtual void IterateActiveScenes(const ActiveIterationCallback& callback) = 0;
+        //! Iterates over all zombie scenes. Zombie scenes are scenes that have been removed but still have references held on to. This can
+        //! happen because scenes hold on to subsystems that can't immediately be deleted. These subsystems may still require being called
+        //! such as a periodic tick. Iteration stops if the callback returns false or all scenes have been listed.
+        virtual void IterateZombieScenes(const ZombieIterationCallback& callback) = 0;
+
+        //! Remove a scene with a given name and return if the operation was successful.
+        virtual bool RemoveScene(AZStd::string_view name) = 0;
+
+        //! Connects the provided handler to the events that are called after scenes are created or before they get removed.
+        virtual void ConnectToEvents(SceneEvent::Handler& handler) = 0;
+
+    protected:
+        // Strictly a forwarding function to call private functions on the scene.
+        void MarkSceneForDestruction(Scene& scene) { scene.MarkForDestruction(); }
+    };
+
+    using SceneSystemInterface = AZ::Interface<ISceneSystem>;
+
+    // EBus wrapper for ScriptCanvas
+    class ISceneSystemRequests
+        : public AZ::EBusTraits
+    {
+    public:
+        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Single;
+        static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
+    };
+    using ILoggerRequestBus = AZ::EBus<ISceneSystem, ISceneSystemRequests>;
+} // AzFramework

Code/Framework/AzFramework/AzFramework/Spawnable/SpawnableAssetHandler.cpp

@@ -81,7 +81,7 @@ namespace AzFramework
 
     const char* SpawnableAssetHandler::GetBrowserIcon() const
     {
-        return "Editor/Icons/Components/Viewport/EntityInSlice.png";
+        return "Icons/Components/Viewport/EntityInSlice.png";
     }
 
     void SpawnableAssetHandler::GetAssetTypeExtensions(AZStd::vector<AZStd::string>& extensions)

Code/Framework/AzFramework/AzFramework/azframework_files.cmake

@@ -194,10 +194,11 @@ set(FILES
     Logging/MissingAssetLogger.h
     Logging/MissingAssetNotificationBus.h
     Scene/Scene.h
+    Scene/Scene.inl
     Scene/Scene.cpp
-    Scene/SceneSystemBus.h
     Scene/SceneSystemComponent.h
     Scene/SceneSystemComponent.cpp
+    Scene/SceneSystemInterface.h
     Script/ScriptComponent.h
     Script/ScriptComponent.cpp
     Script/ScriptDebugAgentBus.h

Code/Framework/AzQtComponents/AzQtComponents/Components/StyleManager.cpp

@@ -250,9 +250,9 @@ namespace AzQtComponents
             // STYLESHEETIMAGES:something.txt
             // UI:blah/blah.png
             // EDITOR:blah/something.txt
-            QDir::addSearchPath("STYLESHEETIMAGES", appPath.filePath("Editor/Styles/StyleSheetImages"));
-            QDir::addSearchPath("UI", appPath.filePath("Editor/UI"));
-            QDir::addSearchPath("EDITOR", appPath.filePath("Editor"));
+            QDir::addSearchPath("STYLESHEETIMAGES", appPath.filePath("Assets/Editor/Styles/StyleSheetImages"));
+            QDir::addSearchPath("UI", appPath.filePath("Assets/Editor/UI"));
+            QDir::addSearchPath("EDITOR", appPath.filePath("Assets/Editor"));
         }
     }
 

Code/Framework/AzQtComponents/AzQtComponents/Components/Widgets/ProgressBar.qss

@@ -24,5 +24,5 @@ QProgressBar
 
 QProgressBar::chunk
 {
-    background: #54AFD0;
+    background: #1E70EB;
 }

Code/Framework/AzQtComponents/AzQtComponents/Components/Widgets/PushButtonConfig.ini

@@ -13,14 +13,14 @@ Width=24;
 ArrowWidth=10;
 
 [PrimaryColorSet]
-Disabled\Start=#7092A7
-Disabled\End=#7092A7
-Sunken\Start=#0073BB
-Sunken\End=#0073BB
-Hovered\Start=#44BAFF
-Hovered\End=#4AB2F8
+Disabled\Start=#2A4875
+Disabled\End=#2A4875
+Sunken\Start=#1E70EB
+Sunken\End=#1E70EB
+Hovered\Start=#4ABAFF
+Hovered\End=#94D2FF
 Normal\Start=#0095F2
-Normal\End=#0073BB
+Normal\End=#1E70EB
 
 [SecondaryColorSet]
 Disabled\Start=#666666
@@ -42,10 +42,10 @@ Color=#3D000000
 
 [FocusedBorder]
 Thickness=1
-Color=#00A1C9
+Color=#4B8CEF
 
 [IconButton]
-ActiveColor=#00A1C9
+ActiveColor=#1E70EB
 DisabledColor=#999999
 SelectedColor=#FFFFFF
 

Code/Framework/AzQtComponents/AzQtComponents/Components/Widgets/SliderConfig.ini

@@ -12,7 +12,7 @@ HandleBorder\Color=#FFFFFF
 HandleBorder\Radius=1.5
 
 [Slider]
-Handle\Color=#0185D7
+Handle\Color=#1E70EB
 Handle\ColorDisabled=#999999
 Handle\Size=12
 Handle\SizeMinusMargin=8

Code/Framework/AzQtComponents/AzQtComponents/Components/Widgets/Text.cpp

@@ -46,7 +46,7 @@ namespace AzQtComponents
     Text::Config Text::defaultConfig()
     {
         Config config;
-        config.hyperlinkColor = QStringLiteral("#44B2F8");
+        config.hyperlinkColor = QStringLiteral("#94D2FF");
 
         return config;
     }

Code/Framework/AzQtComponents/AzQtComponents/Components/Widgets/TextConfig.ini

@@ -1,2 +1,2 @@
 [Hyperlink]
-Color=#44B2F8
+Color=#94D2FF

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/off-focus.svg

@@ -4,7 +4,7 @@
     <title>Selection Controls / Checkbox / Off</title>
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-Off" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-        <g id="checkbox-(off)" stroke="#00A1C9">
+        <g id="checkbox-(off)" stroke="#4B8CEF">
             <path d="M14.2222222,0.5 L1.77777778,0.5 C1.07614237,0.5 0.5,1.07614237 0.5,1.77777778 L0.5,14.2222222 C0.5,14.9238576 1.07614237,15.5 1.77777778,15.5 L14.2222222,15.5 C14.9238576,15.5 15.5,14.9238576 15.5,14.2222222 L15.5,1.77777778 C15.5,1.07614237 14.9238576,0.5 14.2222222,0.5 Z" id="Shape"></path>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/on-disabled.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-On---Disabled" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="checkbox-(on)">
-            <path d="M1.77777778,0 C0.8,0 0,0.8 0,1.77777778 L0,14.2222222 C0,15.2 0.8,16 1.77777778,16 L14.2222222,16 C15.2,16 16,15.2 16,14.2222222 L16,1.77777778 C16,0.8 15.2,0 14.2222222,0 L1.77777778,0 Z" id="Shape" fill="#7092A7"></path>
+            <path d="M1.77777778,0 C0.8,0 0,0.8 0,1.77777778 L0,14.2222222 C0,15.2 0.8,16 1.77777778,16 L14.2222222,16 C15.2,16 16,15.2 16,14.2222222 L16,1.77777778 C16,0.8 15.2,0 14.2222222,0 L1.77777778,0 Z" id="Shape" fill="#2A4875"></path>
             <polygon id="Path" fill="#BBBBBB" points="1 8.19230769 2.4 6.84615385 6 10.3076923 13.6 3 15 4.34615385 6 13"></polygon>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/on-focus.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-On-focus" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="checkbox-(on)">
-            <path d="M14.2222222,0.5 L1.77777778,0.5 C1.07614237,0.5 0.5,1.07614237 0.5,1.77777778 L0.5,14.2222222 C0.5,14.9238576 1.07614237,15.5 1.77777778,15.5 L14.2222222,15.5 C14.9238576,15.5 15.5,14.9238576 15.5,14.2222222 L15.5,1.77777778 C15.5,1.07614237 14.9238576,0.5 14.2222222,0.5 Z" id="Shape" stroke="#00A1C9" fill="#0073BB"></path>
+            <path d="M14.2222222,0.5 L1.77777778,0.5 C1.07614237,0.5 0.5,1.07614237 0.5,1.77777778 L0.5,14.2222222 C0.5,14.9238576 1.07614237,15.5 1.77777778,15.5 L14.2222222,15.5 C14.9238576,15.5 15.5,14.9238576 15.5,14.2222222 L15.5,1.77777778 C15.5,1.07614237 14.9238576,0.5 14.2222222,0.5 Z" id="Shape" stroke="#4B8CEF" fill="#1E70EB"></path>
             <polygon id="Path" fill="#FFFFFF" points="1 8.19230769 2.4 6.84615385 6 10.3076923 13.6 3 15 4.34615385 6 13"></polygon>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/on.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-On" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="checkbox-(on)">
-            <path d="M1.77777778,0 C0.8,0 0,0.8 0,1.77777778 L0,14.2222222 C0,15.2 0.8,16 1.77777778,16 L14.2222222,16 C15.2,16 16,15.2 16,14.2222222 L16,1.77777778 C16,0.8 15.2,0 14.2222222,0 L1.77777778,0 Z" id="Shape" fill="#0073BB"></path>
+            <path d="M1.77777778,0 C0.8,0 0,0.8 0,1.77777778 L0,14.2222222 C0,15.2 0.8,16 1.77777778,16 L14.2222222,16 C15.2,16 16,15.2 16,14.2222222 L16,1.77777778 C16,0.8 15.2,0 14.2222222,0 L1.77777778,0 Z" id="Shape" fill="#1E70EB"></path>
             <polygon id="Path" fill="#FFFFFF" points="1 8.19230769 2.4 6.84615385 6 10.3076923 13.6 3 15 4.34615385 6 13"></polygon>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/partial-selected-disabled.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-Partial-Selected" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="Group">
-            <rect id="Rectangle-10" fill="#7092A7" x="0" y="0" width="16" height="16" rx="2"></rect>
+            <rect id="Rectangle-10" fill="#2A4875" x="0" y="0" width="16" height="16" rx="2"></rect>
             <rect id="Rectangle-9" fill="#BBBBBB" x="3" y="7" width="10" height="2"></rect>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/partial-selected-focus.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-Partial-Selected" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="Group">
-            <path d="M14.2222222,0.5 L1.77777778,0.5 C1.07614237,0.5 0.5,1.07614237 0.5,1.77777778 L0.5,14.2222222 C0.5,14.9238576 1.07614237,15.5 1.77777778,15.5 L14.2222222,15.5 C14.9238576,15.5 15.5,14.9238576 15.5,14.2222222 L15.5,1.77777778 C15.5,1.07614237 14.9238576,0.5 14.2222222,0.5 Z" id="Shape" stroke="#00A1C9" fill="#0073BB"></path>
+            <path d="M14.2222222,0.5 L1.77777778,0.5 C1.07614237,0.5 0.5,1.07614237 0.5,1.77777778 L0.5,14.2222222 C0.5,14.9238576 1.07614237,15.5 1.77777778,15.5 L14.2222222,15.5 C14.9238576,15.5 15.5,14.9238576 15.5,14.2222222 L15.5,1.77777778 C15.5,1.07614237 14.9238576,0.5 14.2222222,0.5 Z" id="Shape" stroke="#4B8CEF" fill="#1E70EB"></path>
             <rect id="Rectangle-9" fill="#FFFFFF" x="3" y="7" width="10" height="2"></rect>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/checkbox/partial-selected.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Checkbox-/-Partial-Selected" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="Group">
-            <rect id="Rectangle-10" fill="#0073BB" x="0" y="0" width="16" height="16" rx="2"></rect>
+            <rect id="Rectangle-10" fill="#1E70EB" x="0" y="0" width="16" height="16" rx="2"></rect>
             <rect id="Rectangle-9" fill="#FFFFFF" x="3" y="7" width="10" height="2"></rect>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/radiobutton/checked-disabled.svg

@@ -4,7 +4,7 @@
     <title>Selection Controls / Radio Button / On - Disabled</title>
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Radio-Button-/-On---Disabled" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-        <circle id="Oval" fill="#7092A7" cx="8" cy="8" r="8"></circle>
+        <circle id="Oval" fill="#2A4875" cx="8" cy="8" r="8"></circle>
         <circle id="Oval" fill="#BBBBBB" cx="8" cy="8" r="4"></circle>
     </g>
 </svg>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/radiobutton/checked-focus.svg

@@ -4,7 +4,7 @@
     <title>Selection Controls / Radio Button / On-focus</title>
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Radio-Button-/-On-focus" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-        <circle id="Oval" stroke="#00A1C9" fill="#0073BB" cx="9" cy="9" r="8.5"></circle>
+        <circle id="Oval" stroke="#4B8CEF" fill="#1E70EB" cx="9" cy="9" r="8.5"></circle>
         <circle id="Oval" fill="#FFFFFF" cx="9" cy="9" r="4"></circle>
     </g>
 </svg>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/radiobutton/checked.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Radio-Button-/-On" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="radio-button-(on)">
-            <circle id="Oval" fill="#0073BB" cx="8" cy="8" r="8"></circle>
+            <circle id="Oval" fill="#1E70EB" cx="8" cy="8" r="8"></circle>
             <circle id="Oval" fill="#FFFFFF" cx="8" cy="8" r="4"></circle>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/radiobutton/unchecked-focus.svg

@@ -4,7 +4,7 @@
     <title>Selection Controls / Radio Button / Off-focus</title>
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Radio-Button-/-Off-focus" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
-        <g id="radio-button-(off)" transform="translate(1.000000, 1.000000)" stroke="#00A1C9">
+        <g id="radio-button-(off)" transform="translate(1.000000, 1.000000)" stroke="#4B8CEF">
             <circle id="Oval" cx="8" cy="8" r="8.5"></circle>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/toggleswitch/checked-disabled.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Switch-/-On---Disabled" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="switch-(on)">
-            <path d="M25.4117647,16 L6.58823529,16 C2.91764706,16 0,12.4571429 0,8 C0,3.54285714 2.91764706,0 6.58823529,0 L25.4117647,0 C29.0823529,0 32,3.54285714 32,8 C32,12.4571429 29.0823529,16 25.4117647,16 Z" id="track" fill="#7092A7"></path>
+            <path d="M25.4117647,16 L6.58823529,16 C2.91764706,16 0,12.4571429 0,8 C0,3.54285714 2.91764706,0 6.58823529,0 L25.4117647,0 C29.0823529,0 32,3.54285714 32,8 C32,12.4571429 29.0823529,16 25.4117647,16 Z" id="track" fill="#2A4875"></path>
             <circle id="knob" fill="#BBBBBB" cx="24" cy="8" r="6"></circle>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/toggleswitch/checked-focus.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Switch-/-On-focus" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="switch-(on)" transform="translate(1.000000, 1.000000)">
-            <path d="M25.4117647,16.5 L6.58823529,16.5 C2.61773665,16.5 -0.5,12.7141769 -0.5,8 C-0.5,3.28582307 2.61773665,-0.5 6.58823529,-0.5 L25.4117647,-0.5 C29.3822634,-0.5 32.5,3.28582307 32.5,8 C32.5,12.7141769 29.3822634,16.5 25.4117647,16.5 Z" id="track" stroke="#00A1C9" fill="#0073BB"></path>
+            <path d="M25.4117647,16.5 L6.58823529,16.5 C2.61773665,16.5 -0.5,12.7141769 -0.5,8 C-0.5,3.28582307 2.61773665,-0.5 6.58823529,-0.5 L25.4117647,-0.5 C29.3822634,-0.5 32.5,3.28582307 32.5,8 C32.5,12.7141769 29.3822634,16.5 25.4117647,16.5 Z" id="track" stroke="#4B8CEF" fill="#1E70EB"></path>
             <circle id="knob" fill="#FFFFFF" cx="24" cy="8" r="6"></circle>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/toggleswitch/checked.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Switch-/-On" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="switch-(on)">
-            <path d="M25.4117647,16 L6.58823529,16 C2.91764706,16 0,12.4571429 0,8 C0,3.54285714 2.91764706,0 6.58823529,0 L25.4117647,0 C29.0823529,0 32,3.54285714 32,8 C32,12.4571429 29.0823529,16 25.4117647,16 Z" id="track" fill="#0073BB"></path>
+            <path d="M25.4117647,16 L6.58823529,16 C2.91764706,16 0,12.4571429 0,8 C0,3.54285714 2.91764706,0 6.58823529,0 L25.4117647,0 C29.0823529,0 32,3.54285714 32,8 C32,12.4571429 29.0823529,16 25.4117647,16 Z" id="track" fill="#1E70EB"></path>
             <circle id="knob" fill="#FFFFFF" cx="24" cy="8" r="6"></circle>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/UI20/toggleswitch/unchecked-focus.svg

@@ -5,7 +5,7 @@
     <desc>Created with Sketch.</desc>
     <g id="Selection-Controls-/-Switch-/-Off-focus" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
         <g id="switch-(off)" transform="translate(1.000000, 1.000000)">
-            <path d="M25.0231909,16.5 L7.01632718,16.5 C2.97419648,16.5 -0.5,12.6299076 -0.5,8 C-0.5,3.37009242 2.97419648,-0.5 7.01632718,-0.5 L25.0231909,-0.5 C29.0586432,-0.5 32.5,3.36297526 32.5,8 C32.5,12.6370247 29.0586432,16.5 25.0231909,16.5 Z" id="track" stroke="#00A1C9"></path>
+            <path d="M25.0231909,16.5 L7.01632718,16.5 C2.97419648,16.5 -0.5,12.6299076 -0.5,8 C-0.5,3.37009242 2.97419648,-0.5 7.01632718,-0.5 L25.0231909,-0.5 C29.0586432,-0.5 32.5,3.36297526 32.5,8 C32.5,12.6370247 29.0586432,16.5 25.0231909,16.5 Z" id="track" stroke="#4B8CEF"></path>
             <circle id="knob" fill="#FFFFFF" cx="8" cy="8" r="6"></circle>
         </g>
     </g>

Code/Framework/AzQtComponents/AzQtComponents/Components/img/loading.svg

@@ -1,6 +1,6 @@
  <svg version="1.1" class="loader" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
  width="40px" height="40px" viewBox="0 0 50 50" style="enable-background:new 0 0 50 50;" xml:space="preserve">
-  <path fill="#54AFD0" d="M43.935,25.145c0-10.318-8.364-18.683-18.683-18.683c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615c8.072,0,14.615,6.543,14.615,14.615H43.935z">
+  <path fill="#1E70EB" d="M43.935,25.145c0-10.318-8.364-18.683-18.683-18.683c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615c8.072,0,14.615,6.543,14.615,14.615H43.935z">
     <animateTransform attributeType="xml"
       attributeName="transform"
       type="rotate"

Code/Framework/AzQtComponents/AzQtComponents/Components/resources.qrc

@@ -388,8 +388,8 @@
     <file>img/line.png</file>
 </qresource>
 <qresource>
-    <file alias="Editor/Style/EditorStylesheetVariables_Dark.json">../../../../Sandbox/Editor/Style/EditorStylesheetVariables_Dark.json</file>
-    <file alias="Editor/Style/NewEditorStylesheet.qss">../../../../Sandbox/Editor/Style/NewEditorStylesheet.qss</file>
+    <file alias="Assets/Editor/Style/EditorStylesheetVariables_Dark.json">../../../../Sandbox/Editor/Style/EditorStylesheetVariables_Dark.json</file>
+    <file alias="Assets/Editor/Style/NewEditorStylesheet.qss">../../../../Sandbox/Editor/Style/NewEditorStylesheet.qss</file>
 </qresource>
 <qresource prefix="/Cards">
     <file>img/UI20/Cards/point_hand.png</file>

Code/Framework/AzToolsFramework/AzToolsFramework/Application/ToolsApplication.cpp

@@ -284,6 +284,10 @@ namespace AzToolsFramework
     void ToolsApplication::Start(const Descriptor& descriptor, const StartupParameters& startupParameters/* = StartupParameters()*/)
     {
         Application::Start(descriptor, startupParameters);
+        if (!m_isStarted)
+        {
+            return;
+        }
 
         m_editorEntityManager.Start();
 

Code/Framework/AzToolsFramework/AzToolsFramework/Asset/AssetUtils.cpp

@@ -216,14 +216,9 @@ namespace AzToolsFramework::AssetUtils
         constexpr const char* AssetProcessorGamePlatformConfigFileName = "AssetProcessorGamePlatformConfig.ini";
         constexpr const char* AssetProcessorGamePlatformConfigSetreg = "AssetProcessorGamePlatformConfig.setreg";
         AZStd::vector<AZ::IO::Path> configFiles;
-        AZ::IO::Path configRoot(engineRoot);
 
-        AZ::IO::Path rootConfigFile = configRoot / AssetProcessorPlatformConfigFileName;
-        configFiles.push_back(rootConfigFile);
-
-        // Add a file entry for the Engine Root AssetProcessor setreg file
-        rootConfigFile = configRoot / AssetProcessorPlatformConfigSetreg;
-        configFiles.push_back(rootConfigFile);
+        // Add the AssetProcessorPlatformConfig setreg file at the engine root
+        configFiles.push_back(AZ::IO::Path(engineRoot) / AssetProcessorPlatformConfigSetreg);
 
         if (addPlatformConfigs)
         {

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/AssetBrowserComponent.cpp

@@ -200,67 +200,67 @@ namespace AzToolsFramework
             {
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".abc"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/ABC_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/ABC_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".bnk"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Audio_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Audio_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".cgf"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/LegacyMesh_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/LegacyMesh_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".font"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Font_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Font_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".fontfamily"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Font_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Font_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".i_caf"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/LegacyAnimation_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/LegacyAnimation_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".inputbindings"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/InputBindings_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/InputBindings_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".lua"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Lua_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Lua_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".mtl"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Material_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Material_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), AzToolsFramework::SliceUtilities::GetSliceFileExtension().c_str()))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Slice_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Slice_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".skin"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/LegacySkin_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/LegacySkin_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".ttf"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/Font_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/Font_16.svg");
                 }
 
                 if (AzFramework::StringFunc::Equal(extension.c_str(), ".xml"))
                 {
-                    return SourceFileDetails("Editor/Icons/AssetBrowser/XML_16.svg");
+                    return SourceFileDetails("Icons/AssetBrowser/XML_16.svg");
                 }
 
 
@@ -272,7 +272,7 @@ namespace AzToolsFramework
                     const char* sourceFormatExtension = sourceFormats[sourceImageFormatIndex];
                     if (AzFramework::StringFunc::Equal(extension.c_str(), sourceFormatExtension))
                     {
-                        return SourceFileDetails("Editor/Icons/AssetBrowser/Image_16.svg");
+                        return SourceFileDetails("Icons/AssetBrowser/Image_16.svg");
                     }
                 }
             }

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Entries/RootAssetBrowserEntry.cpp

@@ -52,17 +52,16 @@ namespace AzToolsFramework
             return AssetEntryType::Root;
         }
 
-        void RootAssetBrowserEntry::Update(const char* devPath)
+        void RootAssetBrowserEntry::Update(const char* enginePath)
         {
             RemoveChildren();
             EntryCache::GetInstance()->Clear();
-            m_scanFolderOutputPrefixMap.clear();
 
-            m_devPath = devPath;
+            m_enginePath = enginePath;
 
             // there is no "Gems" scan folder registered in db, create one manually
             auto gemFolder = aznew FolderAssetBrowserEntry();
-            gemFolder->m_name = m_devPath + AZ_CORRECT_DATABASE_SEPARATOR + GEMS_FOLDER_NAME;
+            gemFolder->m_name = m_enginePath + AZ_CORRECT_DATABASE_SEPARATOR + GEMS_FOLDER_NAME;
             gemFolder->m_displayName = GEMS_FOLDER_NAME;
             gemFolder->m_isGemsFolder = true;
             AddChild(gemFolder);
@@ -90,11 +89,6 @@ namespace AzToolsFramework
                 scanFolder->m_displayName = QString::fromUtf8(scanFolderDatabaseEntry.m_displayName.c_str());
                 EntryCache::GetInstance()->m_scanFolderIdMap[scanFolderDatabaseEntry.m_scanFolderID] = scanFolder;
             }
-
-            if (!scanFolderDatabaseEntry.m_outputPrefix.empty())
-            {
-                m_scanFolderOutputPrefixMap[scanFolderDatabaseEntry.m_scanFolderID] = scanFolderDatabaseEntry.m_outputPrefix;
-            }
         }
 
         void RootAssetBrowserEntry::AddFile(const AssetDatabase::FileDatabaseEntry& fileDatabaseEntry)
@@ -132,7 +126,7 @@ namespace AzToolsFramework
                 return;
             }
 
-            const char* filePath = GetScanFolderOutputAdjustedPath(fileDatabaseEntry, scanFolder);
+            const char* filePath = fileDatabaseEntry.m_fileName.c_str();
 
             AssetBrowserEntry* file;
             // file can be either folder or actual file
@@ -441,33 +435,5 @@ namespace AzToolsFramework
         {
             return MAKE_TKEY(ThumbnailKey);
         }
-
-        const char* RootAssetBrowserEntry::GetScanFolderOutputAdjustedPath(const AssetDatabase::FileDatabaseEntry& fileDatabaseEntry, const AssetBrowserEntry* scanFolder)
-        {
-            Q_UNUSED(scanFolder);
-
-            const char* filePath = fileDatabaseEntry.m_fileName.c_str();
-
-            // adjust for output prefixes on scan folders (i.e. "editor")
-            auto itScanFolderOutputPrefix = m_scanFolderOutputPrefixMap.find(fileDatabaseEntry.m_scanFolderPK);
-            if (itScanFolderOutputPrefix != m_scanFolderOutputPrefixMap.end())
-            {
-                const AZStd::string& outputPrefix = itScanFolderOutputPrefix->second;
-
-                // Check if the input path starts with the output prefix.
-                // If it doesn't, something probably went seriously wrong,
-                // or someone is calling this function with an absolute path.
-                bool pathStartsWithPrefix = ((strncmp(filePath, outputPrefix.c_str(), outputPrefix.length()) == 0) && (fileDatabaseEntry.m_fileName.length() > (outputPrefix.length() + 1)));
-                AZ_Warning("Asset Browser", pathStartsWithPrefix, "Entry %s reported as under a ScanFolder (%s) with an 'output=%s', but the new entry does not begin with the output prefix! RootAssetBrowserEntry::GetScanFolderOutputAdjustedPath expects relative paths, not absolute; treating the input path as if it does not contain the ScanFolder output prefix.", filePath, scanFolder->m_name.c_str(), outputPrefix.c_str());
-
-                if (pathStartsWithPrefix)
-                {
-                    // move the beginning ahead by the output prefix plus the separator
-                    filePath += (outputPrefix.length() + 1);
-                }
-            }
-
-            return filePath;
-        }
     } // namespace AssetBrowser
 } // namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Entries/RootAssetBrowserEntry.h

@@ -60,8 +60,8 @@ namespace AzToolsFramework
 
             AssetEntryType GetEntryType() const override;
 
-            //! Update root node to new dev location
-            void Update(const char* devPath);
+            //! Update root node to new engine location
+            void Update(const char* enginePath);
 
             void AddScanFolder(const AssetDatabase::ScanFolderDatabaseEntry& scanFolderDatabaseEntry);
             void AddFile(const AssetDatabase::FileDatabaseEntry& fileDatabaseEntry);
@@ -82,15 +82,12 @@ namespace AzToolsFramework
         private:
             AZ_DISABLE_COPY_MOVE(RootAssetBrowserEntry);
 
-            AZStd::string m_devPath;
-            AZStd::unordered_map<AZ::s64, AZStd::string> m_scanFolderOutputPrefixMap;
+            AZStd::string m_enginePath;
 
             //! Create folder entry child
             FolderAssetBrowserEntry* CreateFolder(const char* folderName, AssetBrowserEntry* parent);
             //! Recursively create folder structure leading to relative path from parent
             AssetBrowserEntry* CreateFolders(const char* relativePath, AssetBrowserEntry* parent);
-            //! Get the path for the fileDatabaseEntry, offset by the output prefix for the scan folder ancestor, if it's been specified and if it's appropriate
-            const char* GetScanFolderOutputAdjustedPath(const AssetDatabase::FileDatabaseEntry& fileDatabaseEntry, const AssetBrowserEntry* scanFolder);
 
             bool m_isInitialUpdate = false;
         };

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Thumbnails/FolderThumbnail.cpp

@@ -50,11 +50,11 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // FolderThumbnail
         //////////////////////////////////////////////////////////////////////////
-        static constexpr const char* FolderIconPath = "Editor/Icons/AssetBrowser/Folder_16.svg";
-        static constexpr const char* GemIconPath = "Editor/Icons/AssetBrowser/GemFolder_16.svg";
+        static constexpr const char* FolderIconPath = "Icons/AssetBrowser/Folder_16.svg";
+        static constexpr const char* GemIconPath = "Icons/AssetBrowser/GemFolder_16.svg";
 
-        FolderThumbnail::FolderThumbnail(SharedThumbnailKey key, int thumbnailSize)
-            : Thumbnail(key, thumbnailSize)
+        FolderThumbnail::FolderThumbnail(SharedThumbnailKey key)
+            : Thumbnail(key)
         {}
 
         void FolderThumbnail::LoadThread()
@@ -69,7 +69,8 @@ namespace AzToolsFramework
             AZStd::string absoluteIconPath;
             AZ::StringFunc::Path::Join(engineRoot, folderIcon, absoluteIconPath);
 
-            m_icon = QIcon(absoluteIconPath.c_str());
+            m_pixmap.load(absoluteIconPath.c_str());
+            m_state = m_pixmap.isNull() ? State::Failed : State::Ready;
         }
 
         //////////////////////////////////////////////////////////////////////////

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Thumbnails/FolderThumbnail.h

@@ -47,7 +47,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            FolderThumbnail(SharedThumbnailKey key, int thumbnailSize);
+            FolderThumbnail(SharedThumbnailKey key);
             void LoadThread() override;
         };
 

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Thumbnails/ProductThumbnail.cpp

@@ -55,10 +55,10 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // ProductThumbnail
         //////////////////////////////////////////////////////////////////////////
-        static const char* DEFAULT_PRODUCT_ICON_PATH = "Editor/Icons/AssetBrowser/DefaultProduct_16.svg";
+        static const char* DEFAULT_PRODUCT_ICON_PATH = "Icons/AssetBrowser/DefaultProduct_16.svg";
 
-        ProductThumbnail::ProductThumbnail(Thumbnailer::SharedThumbnailKey key, int thumbnailSize)
-            : Thumbnail(key, thumbnailSize)
+        ProductThumbnail::ProductThumbnail(Thumbnailer::SharedThumbnailKey key)
+            : Thumbnail(key)
         {}
 
         void ProductThumbnail::LoadThread() 
@@ -96,12 +96,8 @@ namespace AzToolsFramework
                 iconPath = QString::fromUtf8(DEFAULT_PRODUCT_ICON_PATH);
             }
 
-            m_icon = QIcon(iconPath);
-
-            if (m_icon.isNull())
-            {
-                m_state = State::Failed;
-            }
+            m_pixmap.load(iconPath);
+            m_state = m_pixmap.isNull() ? State::Failed : State::Ready;
         }
 
         //////////////////////////////////////////////////////////////////////////

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Thumbnails/ProductThumbnail.h

@@ -44,7 +44,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            ProductThumbnail(Thumbnailer::SharedThumbnailKey key, int thumbnailSize);
+            ProductThumbnail(Thumbnailer::SharedThumbnailKey key);
 
         protected:
             void LoadThread() override;

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Thumbnails/SourceThumbnail.cpp

@@ -55,11 +55,11 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // SourceThumbnail
         //////////////////////////////////////////////////////////////////////////
-        static constexpr const char* DefaultFileIconPath = "Editor/Icons/AssetBrowser/Default_16.svg";
+        static constexpr const char* DefaultFileIconPath = "Icons/AssetBrowser/Default_16.svg";
         QMutex SourceThumbnail::m_mutex;
 
-        SourceThumbnail::SourceThumbnail(SharedThumbnailKey key, int thumbnailSize)
-            : Thumbnail(key, thumbnailSize)
+        SourceThumbnail::SourceThumbnail(SharedThumbnailKey key)
+            : Thumbnail(key)
         {
         }
 
@@ -124,7 +124,8 @@ namespace AzToolsFramework
                 iconPathToUse = iconPath.c_str();
             }
 
-            m_icon = QIcon(iconPathToUse);
+            m_pixmap.load(iconPathToUse);
+            m_state = m_pixmap.isNull() ? State::Failed : State::Ready;
         }
 
         //////////////////////////////////////////////////////////////////////////

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Thumbnails/SourceThumbnail.h

@@ -44,7 +44,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            SourceThumbnail(SharedThumbnailKey key, int thumbnailSize);
+            SourceThumbnail(SharedThumbnailKey key);
 
         protected:
             void LoadThread() override;

Code/Framework/AzToolsFramework/AzToolsFramework/AssetBrowser/Views/EntryDelegate.cpp

@@ -140,7 +140,7 @@ namespace AzToolsFramework
             else
             {
                 // Scaling and centering pixmap within bounds to preserve aspect ratio
-                const QPixmap pixmap = thumbnail->GetPixmap(size).scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
+                const QPixmap pixmap = thumbnail->GetPixmap().scaled(size, Qt::KeepAspectRatio, Qt::SmoothTransformation);
                 const QSize sizeDelta = size - pixmap.size();
                 const QPoint pointDelta = QPoint(sizeDelta.width() / 2, sizeDelta.height() / 2);
                 painter->drawPixmap(point + pointDelta, pixmap);

Code/Framework/AzToolsFramework/AzToolsFramework/AssetDatabase/AssetDatabaseConnection.cpp

@@ -943,10 +943,8 @@ namespace AzToolsFramework
             const char* scanFolder,
             const char* displayName,
             const char* portableKey,
-            const char* outputPrefix,
             int isRoot)
             : m_scanFolderID(scanFolderID)
-            , m_outputPrefix(outputPrefix)
             , m_isRoot(isRoot)
         {
             if (scanFolder)
@@ -967,10 +965,8 @@ namespace AzToolsFramework
             const char* scanFolder,
             const char* displayName,
             const char* portableKey,
-            const char* outputPrefix,
             int isRoot)
-            : m_outputPrefix(outputPrefix)
-            , m_isRoot(isRoot)
+            : m_isRoot(isRoot)
         {
             if (scanFolder)
             {
@@ -993,7 +989,6 @@ namespace AzToolsFramework
             , m_scanFolder(other.m_scanFolder)
             , m_displayName(other.m_displayName)
             , m_portableKey(other.m_portableKey)
-            , m_outputPrefix(other.m_outputPrefix)
             , m_isRoot(other.m_isRoot)
         {
         }
@@ -1011,7 +1006,6 @@ namespace AzToolsFramework
                 m_scanFolderID = other.m_scanFolderID;
                 m_displayName = AZStd::move(other.m_displayName);
                 m_portableKey = AZStd::move(other.m_portableKey);
-                m_outputPrefix = AZStd::move(other.m_outputPrefix);
                 m_isRoot = other.m_isRoot;
             }
             return *this;
@@ -1023,7 +1017,6 @@ namespace AzToolsFramework
             m_scanFolderID = other.m_scanFolderID;
             m_displayName = other.m_displayName;
             m_portableKey = other.m_portableKey;
-            m_outputPrefix = other.m_outputPrefix;
             m_isRoot = other.m_isRoot;
             return *this;
         }
@@ -1050,7 +1043,6 @@ namespace AzToolsFramework
                 MakeColumn("ScanFolder", m_scanFolder),
                 MakeColumn("DisplayName", m_displayName),
                 MakeColumn("PortableKey", m_portableKey),
-                MakeColumn("OutputPrefix", m_outputPrefix),
                 MakeColumn("IsRoot", m_isRoot)
             );
         }

Code/Framework/AzToolsFramework/AzToolsFramework/AssetDatabase/AssetDatabaseConnection.h

@@ -68,6 +68,7 @@ namespace AzToolsFramework
             AddedLastScanTimeField = 28,
             AddedScanTimeSecondsSinceEpochField = 29,
             ChangedSortFunctionFromQSortToStdStableSort = 30,
+            RemoveOutputPrefixFromScanFolders,
             //Add all new versions before this
             DatabaseVersionCount,
             LatestVersion = DatabaseVersionCount - 1
@@ -99,12 +100,10 @@ namespace AzToolsFramework
                 const char* scanFolder,
                 const char* displayName,
                 const char* portableKey,
-                const char* outputPrefix,
                 int isRoot = 0);
             ScanFolderDatabaseEntry(const char* scanFolder,
                 const char* displayName,
                 const char* portableKey,
-                const char* outputPrefix,
                 int isRoot = 0);
             ScanFolderDatabaseEntry(const ScanFolderDatabaseEntry& other);
             ScanFolderDatabaseEntry(ScanFolderDatabaseEntry&& other);
@@ -120,7 +119,6 @@ namespace AzToolsFramework
             AZStd::string m_scanFolder; // the actual local computer path to that scan folder.
             AZStd::string m_displayName; // a display name, blank means it should not show up in UIs
             AZStd::string m_portableKey; // a key that uniquely identifies a scan folder so that we can recognize the same one in other databases/computer
-            AZStd::string m_outputPrefix;
             int m_isRoot = 0;
         };
 

Code/Framework/AzToolsFramework/AzToolsFramework/Entity/EditorEntityContextBus.h

@@ -49,6 +49,8 @@ namespace AzToolsFramework
         /// Retrieve the Id of the editor entity context.
         virtual AzFramework::EntityContextId GetEditorEntityContextId() = 0;
 
+        virtual AzFramework::EntityContext* GetEditorEntityContextInstance() = 0;
+
         /// Creates an entity in the editor context.
         /// \return the EntityId for the created Entity
         virtual AZ::EntityId CreateNewEditorEntity(const char* name) = 0;

Code/Framework/AzToolsFramework/AzToolsFramework/Entity/EditorEntityContextComponent.h

@@ -77,6 +77,7 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // EditorEntityContextRequestBus
         AzFramework::EntityContextId GetEditorEntityContextId() override { return GetContextId(); }
+        AzFramework::EntityContext* GetEditorEntityContextInstance() override { return this; }
         void ResetEditorContext() override;
 
         AZ::EntityId CreateNewEditorEntity(const char* name) override;

Code/Framework/AzToolsFramework/AzToolsFramework/Manipulators/EditorVertexSelection.cpp

@@ -769,12 +769,12 @@ namespace AzToolsFramework
 
     template<typename Vertex>
     void EditorVertexSelectionBase<Vertex>::DisplayViewport2d(
-        const AzFramework::ViewportInfo& /*viewportInfo*/,
+        const AzFramework::ViewportInfo& viewportInfo,
         AzFramework::DebugDisplayRequests& debugDisplay)
     {
         AZ_PROFILE_FUNCTION(AZ::Debug::ProfileCategory::AzToolsFramework);
 
-        m_editorBoxSelect.Display2d(debugDisplay);
+        m_editorBoxSelect.Display2d(viewportInfo, debugDisplay);
     }
 
     template<typename Vertex>

Code/Framework/AzToolsFramework/AzToolsFramework/MaterialBrowser/MaterialBrowserComponent.cpp

@@ -36,8 +36,7 @@ namespace AzToolsFramework
             using namespace Thumbnailer;
             using namespace AssetBrowser;
             const char* contextName = "MaterialBrowser";
-            int thumbnailSize = qApp->style()->pixelMetric(QStyle::PM_SmallIconSize);
-            ThumbnailerRequestsBus::Broadcast(&ThumbnailerRequests::RegisterContext, contextName, thumbnailSize);
+            ThumbnailerRequestsBus::Broadcast(&ThumbnailerRequests::RegisterContext, contextName);
             ThumbnailerRequestsBus::Broadcast(&ThumbnailerRequests::RegisterThumbnailProvider, MAKE_TCACHE(FolderThumbnailCache), contextName);
             ThumbnailerRequestsBus::Broadcast(&ThumbnailerRequests::RegisterThumbnailProvider, MAKE_TCACHE(SourceThumbnailCache), contextName);
             ThumbnailerRequestsBus::Broadcast(&ThumbnailerRequests::RegisterThumbnailProvider, MAKE_TCACHE(MaterialThumbnailCache), contextName);

Code/Framework/AzToolsFramework/AzToolsFramework/MaterialBrowser/MaterialThumbnail.cpp

@@ -24,8 +24,8 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // MaterialThumbnail
         //////////////////////////////////////////////////////////////////////////
-        MaterialThumbnail::MaterialThumbnail(Thumbnailer::SharedThumbnailKey key, int thumbnailSize)
-            : Thumbnail(key, thumbnailSize)
+        MaterialThumbnail::MaterialThumbnail(Thumbnailer::SharedThumbnailKey key)
+            : Thumbnail(key)
         {
             auto productKey = azrtti_cast<const AzToolsFramework::AssetBrowser::ProductThumbnailKey*>(m_key.data());
             AZ_Assert(productKey, "Incorrect key type, excpected ProductThumbnailKey");
@@ -34,7 +34,8 @@ namespace AzToolsFramework
             MaterialBrowserRequestBus::BroadcastResult(multiMat, &MaterialBrowserRequests::IsMultiMaterial, productKey->GetAssetId());
 
             QString iconPath = multiMat ? MultiMaterialIconPath : SimpleMaterialIconPath;
-            m_pixmap = QPixmap(iconPath).scaled(m_thumbnailSize, m_thumbnailSize, Qt::KeepAspectRatio);
+            m_pixmap.load(iconPath);
+            m_state = m_pixmap.isNull() ? State::Failed : State::Ready;
         }
 
         //////////////////////////////////////////////////////////////////////////

Code/Framework/AzToolsFramework/AzToolsFramework/MaterialBrowser/MaterialThumbnail.h

@@ -28,7 +28,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            MaterialThumbnail(Thumbnailer::SharedThumbnailKey key, int thumbnailSize);
+            MaterialThumbnail(Thumbnailer::SharedThumbnailKey key);
         };
 
         namespace

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/EditorPrefabComponent.cpp

@@ -16,7 +16,6 @@
 #include <AzCore/Serialization/EditContext.h>
 #include <AzToolsFramework/Prefab/PrefabPublicInterface.h>
 #include <AzToolsFramework/UI/EditorEntityUi/EditorEntityUiInterface.h>
-#include <AzToolsFramework/UI/Outliner/EntityOutlinerWidgetInterface.h>
 #include <AzToolsFramework/UI/Prefab/PrefabIntegrationBus.h>
 
 namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/Instance/InstanceUpdateExecutor.cpp

@@ -21,9 +21,9 @@
 #include <AzToolsFramework/Prefab/Instance/TemplateInstanceMapperInterface.h>
 #include <AzToolsFramework/Prefab/PrefabDomUtils.h>
 #include <AzToolsFramework/Prefab/PrefabPublicInterface.h>
+#include <AzToolsFramework/Prefab/PrefabPublicNotificationBus.h>
 #include <AzToolsFramework/Prefab/PrefabSystemComponentInterface.h>
 #include <AzToolsFramework/Prefab/Template/Template.h>
-#include <AzToolsFramework/UI/Outliner/EntityOutlinerWidgetInterface.h>
 
 namespace AzToolsFramework
 {
@@ -90,17 +90,13 @@ namespace AzToolsFramework
 
                 if (instanceCountToUpdateInBatch > 0)
                 {
+                    // Notify Propagation has begun
+                    PrefabPublicNotificationBus::Broadcast(&PrefabPublicNotifications::OnPrefabInstancePropagationBegin);
+
                     EntityIdList selectedEntityIds;
                     ToolsApplicationRequestBus::BroadcastResult(selectedEntityIds, &ToolsApplicationRequests::GetSelectedEntities);
                     ToolsApplicationRequestBus::Broadcast(&ToolsApplicationRequests::SetSelectedEntities, EntityIdList());
 
-                    // Disable the Outliner to avoid showing the propagation steps
-                    EntityOutlinerWidgetInterface* entityOutlinerWidgetInterface = AZ::Interface<EntityOutlinerWidgetInterface>::Get();
-                    if (entityOutlinerWidgetInterface)
-                    {
-                        entityOutlinerWidgetInterface->SetUpdatesEnabled(false);
-                    }
-
                     for (int i = 0; i < instanceCountToUpdateInBatch; ++i)
                     {
                         Instance* instanceToUpdate = m_instancesUpdateQueue.front();
@@ -168,18 +164,8 @@ namespace AzToolsFramework
                     }
                     ToolsApplicationRequestBus::Broadcast(&ToolsApplicationRequests::SetSelectedEntities, selectedEntityIds);
 
-                    // Enable the Outliner
-                    if (entityOutlinerWidgetInterface)
-                    {
-                        entityOutlinerWidgetInterface->SetUpdatesEnabled(true);
-
-                        auto prefabPublicInterface = AZ::Interface<PrefabPublicInterface>::Get();
-                        if (prefabPublicInterface)
-                        {
-                            AZ::EntityId rootEntityId = prefabPublicInterface->GetLevelInstanceContainerEntityId();
-                            entityOutlinerWidgetInterface->ExpandEntityChildren(rootEntityId);
-                        }
-                    }
+                    // Notify Propagation has ended
+                    PrefabPublicNotificationBus::Broadcast(&PrefabPublicNotifications::OnPrefabInstancePropagationEnd);
                 }
 
                 m_updatingTemplateInstancesInQueue = false;

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/Link/Link.cpp

@@ -108,11 +108,9 @@ namespace AzToolsFramework
             m_targetTemplateId = id;
         }
 
-        void Link::SetTemplatePatches(const PrefabDomValue& patches)
+        void Link::SetLinkDom(const PrefabDomValue& linkDom)
         {
-            PrefabDom newPatches;
-            newPatches.CopyFrom(patches, newPatches.GetAllocator());
-            m_linkDom.Swap(newPatches);
+            m_linkDom.CopyFrom(linkDom, m_linkDom.GetAllocator());
         }
 
         void Link::SetInstanceName(const char* instanceName)

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/Link/Link.h

@@ -47,7 +47,7 @@ namespace AzToolsFramework
 
             void SetSourceTemplateId(TemplateId id);
             void SetTargetTemplateId(TemplateId id);
-            void SetTemplatePatches(const PrefabDomValue& patches);
+            void SetLinkDom(const PrefabDomValue& linkDom);
             void SetInstanceName(const char* instanceName);
 
             bool IsValid() const;

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabPublicNotificationBus.h

@@ -0,0 +1,34 @@
+/*
+ * All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
+ * its licensors.
+ *
+ * For complete copyright and license terms please see the LICENSE at the root of this
+ * distribution (the "License"). All use of this software is governed by the License,
+ * or, if provided, by the license below or the license accompanying this file. Do not
+ * remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *
+ */
+
+#pragma once
+
+#include <AzCore/EBus/EBus.h>
+
+namespace AzToolsFramework
+{
+    namespace Prefab
+    {
+        class PrefabPublicNotifications
+            : public AZ::EBusTraits
+        {
+        public:
+            virtual ~PrefabPublicNotifications() = default;
+
+            virtual void OnPrefabInstancePropagationBegin() {}
+            virtual void OnPrefabInstancePropagationEnd() {}
+        };
+
+        using PrefabPublicNotificationBus = AZ::EBus<PrefabPublicNotifications>;
+
+    } // namespace Prefab
+} // namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabSystemComponent.cpp

@@ -784,22 +784,21 @@ namespace AzToolsFramework
             link.SetInstanceName(instanceName.data());
 
             PrefabDomValue& instance = instanceIterator->value;
+            AZ_Assert(instance.IsObject(), "Nested instance DOM provided is not a valid JSON object.");
+            PrefabDomValueReference sourceTemplateName = PrefabDomUtils::FindPrefabDomValue(instance, PrefabDomUtils::SourceName);
+            AZ_Assert(sourceTemplateName, "Couldn't find source template name in the DOM of the nested instance while creating a link.");
+            AZ_Assert(
+                sourceTemplateName->get() == sourceTemplate.GetFilePath().c_str(),
+                "The name of the source template in the nested instance DOM does not match the name of the source template already loaded");
 
             PrefabDomValueReference patchesReference = PrefabDomUtils::FindPrefabDomValue(instance, PrefabDomUtils::PatchesName);
-            if (!patchesReference.has_value())
+            if (patchesReference.has_value())
             {
-                PrefabDom& newLinkDom = link.GetLinkDom();
-
-                newLinkDom.SetObject();
-
-                newLinkDom.AddMember(rapidjson::StringRef(PrefabDomUtils::SourceName),
-                    rapidjson::StringRef(sourceTemplate.GetFilePath().c_str()), newLinkDom.GetAllocator());
-            }
-            else
-            {
-                link.SetTemplatePatches(patchesReference->get());
+                AZ_Assert(patchesReference->get().IsArray(), "Patches in the nested instance DOM are not represented as an array.");
             }
 
+            link.SetLinkDom(instance);
+
             if (!link.UpdateTarget())
             {
                 AZ_Error("Prefab", false,

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/LoadingThumbnail.cpp

@@ -18,13 +18,15 @@ namespace AzToolsFramework
 {
     namespace Thumbnailer
     {
+        static constexpr const int LoadingThumbnailSize = 128;
+
         //////////////////////////////////////////////////////////////////////////
         // LoadingThumbnail
         //////////////////////////////////////////////////////////////////////////
-        static const char* LoadingIconPath = "Editor/Icons/AssetBrowser/in_progress.gif";
+        static const char* LoadingIconPath = "Icons/AssetBrowser/in_progress.gif";
 
-        LoadingThumbnail::LoadingThumbnail(int thumbnailSize)
-            : Thumbnail(MAKE_TKEY(ThumbnailKey), thumbnailSize)
+        LoadingThumbnail::LoadingThumbnail()
+            : Thumbnail(MAKE_TKEY(ThumbnailKey))
             , m_angle(0)
         {
             const char* engineRoot = nullptr;
@@ -34,7 +36,7 @@ namespace AzToolsFramework
             AZ::StringFunc::Path::Join(engineRoot, LoadingIconPath, iconPath);
             m_loadingMovie.setFileName(iconPath.c_str());
             m_loadingMovie.setCacheMode(QMovie::CacheMode::CacheAll);
-            m_loadingMovie.setScaledSize(QSize(m_thumbnailSize, m_thumbnailSize));
+            m_loadingMovie.setScaledSize(QSize(LoadingThumbnailSize, LoadingThumbnailSize));
             m_loadingMovie.start();
             m_pixmap = m_loadingMovie.currentPixmap();
             m_state = State::Ready;

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/LoadingThumbnail.h

@@ -29,7 +29,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            explicit LoadingThumbnail(int thumbnailSize);
+            LoadingThumbnail();
             ~LoadingThumbnail() override;
 
             void UpdateTime(float /*deltaTime*/) override;

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/MissingThumbnail.cpp

@@ -16,13 +16,13 @@ namespace AzToolsFramework
 {
     namespace Thumbnailer
     {
-        static const char* MISSING_ICON_PATH = "Editor/Icons/AssetBrowser/Default_16.svg";
+        static const char* MISSING_ICON_PATH = "Icons/AssetBrowser/Default_16.svg";
 
-        MissingThumbnail::MissingThumbnail(int thumbnailSize)
-            : Thumbnail(MAKE_TKEY(ThumbnailKey), thumbnailSize)
+        MissingThumbnail::MissingThumbnail()
+            : Thumbnail(MAKE_TKEY(ThumbnailKey))
         {
-            m_icon = QIcon(MISSING_ICON_PATH);
-            m_state = State::Ready;
+            m_pixmap.load(MISSING_ICON_PATH);
+            m_state = m_pixmap.isNull() ? State::Failed : State::Ready;
         }
 
     } // namespace Thumbnailer

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/MissingThumbnail.h

@@ -24,7 +24,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            explicit MissingThumbnail(int thumbnailSize);
+            MissingThumbnail();
         };
     } // namespace Thumbnailer
 } // namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/SourceControlThumbnail.cpp

@@ -64,13 +64,13 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // SourceControlThumbnail
         //////////////////////////////////////////////////////////////////////////
-        static const char* WRITABLE_ICON_PATH = "Editor/Icons/AssetBrowser/Writable_16.svg";
-        static const char* NONWRITABLE_ICON_PATH = "Editor/Icons/AssetBrowser/NonWritable_16.svg";
+        static const char* WRITABLE_ICON_PATH = "Icons/AssetBrowser/Writable_16.svg";
+        static const char* NONWRITABLE_ICON_PATH = "Icons/AssetBrowser/NonWritable_16.svg";
 
         bool SourceControlThumbnail::m_readyForUpdate = true;
 
-        SourceControlThumbnail::SourceControlThumbnail(SharedThumbnailKey key, int thumbnailSize)
-            : Thumbnail(key, thumbnailSize)
+        SourceControlThumbnail::SourceControlThumbnail(SharedThumbnailKey key)
+            : Thumbnail(key)
         {
             const char* engineRoot = nullptr;
             AzFramework::ApplicationRequests::Bus::BroadcastResult(engineRoot, &AzFramework::ApplicationRequests::GetEngineRoot);
@@ -122,16 +122,16 @@ namespace AzToolsFramework
             {
                 if (fileInfo.HasFlag(AzToolsFramework::SCF_Writeable))
                 {
-                    m_icon = QIcon(m_writableIconPath.c_str());
+                    m_pixmap.load(m_writableIconPath.c_str());
                 }
                 else
                 {
-                    m_icon = QIcon(m_nonWritableIconPath.c_str());
+                    m_pixmap.load(m_nonWritableIconPath.c_str());
                 }
             }
             else
             {
-                m_icon = QIcon();
+                m_pixmap = QPixmap();
             }
             m_readyForUpdate = true;
             emit Updated();

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/SourceControlThumbnail.h

@@ -55,7 +55,7 @@ namespace AzToolsFramework
         {
             Q_OBJECT
         public:
-            SourceControlThumbnail(SharedThumbnailKey key, int thumbnailSize);
+            SourceControlThumbnail(SharedThumbnailKey key);
             ~SourceControlThumbnail() override;
 
             //////////////////////////////////////////////////////////////////////////

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/Thumbnail.cpp

@@ -24,8 +24,6 @@ namespace AzToolsFramework
 {
     namespace Thumbnailer
     {
-        static const int DefaultIconSize = 16;
-
         //////////////////////////////////////////////////////////////////////////
         // ThumbnailKey
         //////////////////////////////////////////////////////////////////////////
@@ -54,10 +52,9 @@ namespace AzToolsFramework
         //////////////////////////////////////////////////////////////////////////
         // Thumbnail
         //////////////////////////////////////////////////////////////////////////
-        Thumbnail::Thumbnail(SharedThumbnailKey key, int thumbnailSize)
+        Thumbnail::Thumbnail(SharedThumbnailKey key)
             : QObject()
             , m_state(State::Unloaded)
-            , m_thumbnailSize(thumbnailSize)
             , m_key(key)
         {
             connect(&m_watcher, &QFutureWatcher<void>::finished, this, [this]()
@@ -91,19 +88,9 @@ namespace AzToolsFramework
             }
         }
 
-        QPixmap Thumbnail::GetPixmap() const
+        const QPixmap& Thumbnail::GetPixmap() const
         {
-            return GetPixmap(QSize(DefaultIconSize, DefaultIconSize));
-        }
-
-        QPixmap Thumbnail::GetPixmap(const QSize& size) const
-        {
-            if (m_icon.isNull())
-            {
-                return m_pixmap;
-            }
-
-            return m_icon.pixmap(size);
+            return m_pixmap;
         }
 
         SharedThumbnailKey Thumbnail::GetKey() const

Code/Framework/AzToolsFramework/AzToolsFramework/Thumbnails/Thumbnail.h

@@ -19,7 +19,6 @@ AZ_PUSH_DISABLE_WARNING(4127 4251 4800, "-Wunknown-warning-option") // 4127: con
                                                                     // 4800: 'int': forcing value to bool 'true' or 'false' (performance warning)
 #include <QObject>
 #include <QPixmap>
-#include <QIcon>
 #include <QFutureWatcher>
 AZ_POP_DISABLE_WARNING
 #endif
@@ -86,12 +85,11 @@ namespace AzToolsFramework
                 Failed
             };
 
-            Thumbnail(SharedThumbnailKey key, int thumbnailSize);
+            Thumbnail(SharedThumbnailKey key);
             ~Thumbnail() override;
             bool operator == (const Thumbnail& other) const;
             void Load();
-            virtual QPixmap GetPixmap() const;
-            virtual QPixmap GetPixmap(const QSize& size) const;
+            const QPixmap& GetPixmap() const;
             virtual void UpdateTime(float /*deltaTime*/) {}
             SharedThumbnailKey GetKey() const;
             State GetState() const;
@@ -105,10 +103,8 @@ namespace AzToolsFramework
         protected:
             QFutureWatcher<void> m_watcher;
             State m_state;
-            int m_thumbnailSize;
             SharedThumbnailKey m_key;
             QPixmap m_pixmap;
-            QIcon m_icon;
 
             virtual void LoadThread() {}
         };
@@ -122,7 +118,6 @@ namespace AzToolsFramework
             ThumbnailProvider() = default;
             virtual ~ThumbnailProvider() = default;
             virtual bool GetThumbnail(SharedThumbnailKey key, SharedThumbnail& thumbnail) = 0;
-            virtual void SetThumbnailSize(int thumbnailSize) = 0;
             //! Priority identifies ThumbnailProvider order in ThumbnailContext
             //! Higher priority means this ThumbnailProvider will take precedence in generating a thumbnail when
             //! a supplied ThumbnailKey is supported by multiple providers.
@@ -185,10 +180,7 @@ namespace AzToolsFramework
 
             bool GetThumbnail(SharedThumbnailKey key, SharedThumbnail& thumbnail) override;
 
-            void SetThumbnailSize(int thumbnailSize) override;
-
         protected:
-            int m_thumbnailSize;
             AZStd::unordered_map<SharedThumbnailKey, SharedThumbnail, Hasher, EqualKey> m_cache;
 
             //! Check if thumbnail key is handled by this provider, overload in derived class