Calculate camera view projection each frame so we can have a fixed size viewport.

Signed-off-by: rhhong <rhhong@amazon.com>
Signed-off-by: Gene Walters <genewalt@amazon.com>

Gems/AtomLyIntegration/EMotionFXAtom/Code/Tools/EMStudio/AnimViewportRenderer.cpp

@@ -128,10 +128,10 @@ namespace EMStudio
         AZ_Assert(m_gridEntity != nullptr, "Failed to create grid entity.");
 
         AZ::Render::GridComponentConfig gridConfig;
-        gridConfig.m_gridSize = 4.0f;
+        gridConfig.m_gridSize = 20.0f;
         gridConfig.m_axisColor = AZ::Color(0.5f, 0.5f, 0.5f, 1.0f);
         gridConfig.m_primaryColor = AZ::Color(0.3f, 0.3f, 0.3f, 1.0f);
-        gridConfig.m_secondaryColor = AZ::Color(0.5f, 0.1f, 0.1f, 1.0f);
+        gridConfig.m_secondaryColor = AZ::Color(0.5f, 0.5f, 0.5f, 1.0f);
         auto gridComponent = m_gridEntity->CreateComponent(AZ::Render::GridComponentTypeId);
         gridComponent->SetConfiguration(gridConfig);
 

Gems/AtomLyIntegration/EMotionFXAtom/Code/Tools/EMStudio/AnimViewportWidget.cpp

@@ -6,10 +6,11 @@
  *
  */
 
-#include <AzCore/Settings/SettingsRegistry.h>
+#include <AzCore/Math/MatrixUtils.h>
 #include <AzFramework/Viewport/ViewportControllerList.h>
 #include <AzFramework/Viewport/CameraInput.h>
 #include <Atom/RPI.Public/ViewportContext.h>
+#include <Atom/RPI.Public/View.h>
 #include <AtomToolsFramework/Viewport/ModularViewportCameraController.h>
 #include <EMotionFX/Tools/EMotionStudio/EMStudioSDK/Source/EMStudioManager.h>
 
@@ -19,6 +20,9 @@
 
 namespace EMStudio
 {
+    static constexpr float DepthNear = 0.01f;
+    static constexpr float DepthFar = 100.0f;
+
     AnimViewportWidget::AnimViewportWidget(QWidget* parent)
         : AtomToolsFramework::RenderViewportWidget(parent)
     {
@@ -166,6 +170,24 @@ namespace EMStudio
         GetViewportContext()->SetCameraTransform(AZ::Transform::CreateLookAt(cameraPosition, targetPosition));
     }
 
+    void AnimViewportWidget::OnTick(float deltaTime, AZ::ScriptTimePoint time)
+    {
+        RenderViewportWidget::OnTick(deltaTime, time);
+        CalculateCameraProjection();
+    }
+
+    void AnimViewportWidget::CalculateCameraProjection()
+    {
+        auto viewportContext = GetViewportContext();
+        auto windowSize = viewportContext->GetViewportSize();
+        const float aspectRatio = aznumeric_cast<float>(windowSize.m_width) / aznumeric_cast<float>(windowSize.m_height);
+
+        AZ::Matrix4x4 viewToClipMatrix;
+        AZ::MakePerspectiveFovMatrixRH(viewToClipMatrix, AZ::Constants::HalfPi, aspectRatio, DepthNear, DepthFar, true);
+
+        viewportContext->GetDefaultView()->SetViewToClipMatrix(viewToClipMatrix);
+    }
+
     void AnimViewportWidget::ToggleRenderFlag(EMotionFX::ActorRenderFlag flag)
     {
         m_renderFlags[flag] = !m_renderFlags[flag];

Gems/AtomLyIntegration/EMotionFXAtom/Code/Tools/EMStudio/AnimViewportWidget.h

@@ -30,6 +30,9 @@ namespace EMStudio
         EMotionFX::ActorRenderFlagBitset GetRenderFlags() const;
 
     private:
+        void OnTick(float deltaTime, AZ::ScriptTimePoint time) override;
+
+        void CalculateCameraProjection();
         void SetupCameras();
         void SetupCameraController();