Updates and fixes to viewport placement (#5712)

* updates to use more modern viewport intersection logic

Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com>

* updates to editor viewport ray intersection for object placement

Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com>

* make ed_defaultEntityPlacementDistance visible to Viewport.cpp

Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com>

* fix link error for AZ_CVAR variable

Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com>

* updates following review feedback

Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com>

Code/Editor/2DViewport.cpp

@@ -234,7 +234,7 @@ void Q2DViewport::UpdateContent(int flags)
 }
 
 //////////////////////////////////////////////////////////////////////////
-void Q2DViewport::OnRButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point)
+void Q2DViewport::OnRButtonDown([[maybe_unused]] Qt::KeyboardModifiers modifiers, const QPoint& point)
 {
     if (GetIEditor()->IsInGameMode())
     {
@@ -246,9 +246,6 @@ void Q2DViewport::OnRButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& p
         setFocus();
     }
 
-    // Check Edit Tool.
-    MouseCallback(eMouseRDown, point, modifiers);
-
     SetCurrentCursor(STD_CURSOR_MOVE, QString());
 
     // Save the mouse down position
@@ -273,17 +270,8 @@ void Q2DViewport::OnRButtonUp([[maybe_unused]] Qt::KeyboardModifiers modifiers,
 }
 
 //////////////////////////////////////////////////////////////////////////
-void Q2DViewport::OnMButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point)
+void Q2DViewport::OnMButtonDown([[maybe_unused]] Qt::KeyboardModifiers modifiers, const QPoint& point)
 {
-    ////////////////////////////////////////////////////////////////////////
-    // User pressed the middle mouse button
-    ////////////////////////////////////////////////////////////////////////
-    // Check Edit Tool.
-    if (MouseCallback(eMouseMDown, point, modifiers))
-    {
-        return;
-    }
-
     // Save the mouse down position
     m_RMouseDownPos = point;
 
@@ -300,14 +288,8 @@ void Q2DViewport::OnMButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& p
 }
 
 //////////////////////////////////////////////////////////////////////////
-void Q2DViewport::OnMButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point)
+void Q2DViewport::OnMButtonUp([[maybe_unused]] Qt::KeyboardModifiers modifiers, [[maybe_unused]] const QPoint& point)
 {
-    // Check Edit Tool.
-    if (MouseCallback(eMouseMUp, point, modifiers))
-    {
-        return;
-    }
-
     SetViewMode(NothingMode);
 
     ReleaseMouse();

Code/Editor/EditorViewportWidget.cpp

@@ -2307,10 +2307,10 @@ void* EditorViewportWidget::GetSystemCursorConstraintWindow() const
     return systemCursorConstrained ? renderOverlayHWND() : nullptr;
 }
 
-void EditorViewportWidget::BuildDragDropContext(AzQtComponents::ViewportDragContext& context, const QPoint& pt)
+void EditorViewportWidget::BuildDragDropContext(
+    AzQtComponents::ViewportDragContext& context, const AzFramework::ViewportId viewportId, const QPoint& point)
 {
-    const auto scaledPoint = WidgetToViewport(pt);
+    QtViewport::BuildDragDropContext(context, viewportId, point);
-    QtViewport::BuildDragDropContext(context, scaledPoint);
 }
 
 void EditorViewportWidget::RestoreViewportAfterGameMode()

Code/Editor/EditorViewportWidget.h

@@ -273,7 +273,8 @@ private:
 
     bool CheckRespondToInput() const;
 
-    void BuildDragDropContext(AzQtComponents::ViewportDragContext& context, const QPoint& pt) override;
+    void BuildDragDropContext(
+        AzQtComponents::ViewportDragContext& context, AzFramework::ViewportId viewportId, const QPoint& point) override;
 
     void SetAsActiveViewport();
     void PushDisableRendering();

Code/Editor/Plugins/ComponentEntityEditorPlugin/SandboxIntegration.cpp

@@ -10,7 +10,6 @@
 #include <AzCore/Component/ComponentApplicationBus.h>
 #include <AzCore/Component/Entity.h>
 #include <AzCore/Component/TransformBus.h>
-#include <AzCore/Console/IConsole.h>
 #include <AzCore/Debug/Profiler.h>
 #include <AzCore/Math/Transform.h>
 #include <AzCore/RTTI/AttributeReader.h>
@@ -57,6 +56,7 @@
 #include <AzToolsFramework/UI/PropertyEditor/EntityPropertyEditor.hxx>
 #include <AzToolsFramework/UI/Layer/NameConflictWarning.hxx>
 #include <AzToolsFramework/ViewportSelection/EditorHelpers.h>
+#include <AzToolsFramework/ViewportSelection/EditorSelectionUtil.h>
 #include <MathConversion.h>
 
 #include <Atom/RPI.Public/ViewportContext.h>
@@ -1394,13 +1394,13 @@ void SandboxIntegrationManager::ContextMenu_NewEntity()
 {
     AZ::Vector3 worldPosition = AZ::Vector3::CreateZero();
 
-    CViewport* view = GetIEditor()->GetViewManager()->GetGameViewport();
     // If we don't have a viewport active to aid in placement, the object
     // will be created at the origin.
-    if (view)
+    if (CViewport* view = GetIEditor()->GetViewManager()->GetGameViewport())
     {
-        const QPoint viewPoint(static_cast<int>(m_contextMenuViewPoint.GetX()), static_cast<int>(m_contextMenuViewPoint.GetY()));
+        worldPosition = AzToolsFramework::FindClosestPickIntersection(
-        worldPosition = view->GetHitLocation(viewPoint);
+            view->GetViewportId(), AzFramework::ScreenPointFromVector2(m_contextMenuViewPoint), AzToolsFramework::EditorPickRayLength,
+            GetDefaultEntityPlacementDistance());
     }
 
     CreateNewEntityAtPosition(worldPosition);

Code/Editor/Viewport.cpp

@@ -14,14 +14,19 @@
 // Qt
 #include <QPainter>
 
+// AzCore
+#include <AzCore/Console/IConsole.h>
+
 // AzQtComponents
 #include <AzQtComponents/DragAndDrop/ViewportDragAndDrop.h>
 
 #include <AzToolsFramework/API/ComponentEntitySelectionBus.h>
 #include <AzToolsFramework/ViewportSelection/EditorSelectionUtil.h>
 #include <AzToolsFramework/Viewport/ViewportMessages.h>
+#include <AzToolsFramework/ViewportSelection/EditorSelectionUtil.h>
 
 // Editor
+#include "Editor/Plugins/ComponentEntityEditorPlugin/SandboxIntegration.h"
 #include "ViewManager.h"
 #include "Include/ITransformManipulator.h"
 #include "Include/HitContext.h"
@@ -32,22 +37,35 @@
 #include "GameEngine.h"
 #include "Settings.h"
 
-
 #ifdef LoadCursor
 #undef LoadCursor
 #endif
 
+AZ_CVAR(
+    float,
+    ed_defaultEntityPlacementDistance,
+    10.0f,
+    nullptr,
+    AZ::ConsoleFunctorFlags::Null,
+    "The default distance to place an entity from the camera if no intersection is found");
+
+float GetDefaultEntityPlacementDistance()
+{
+    return ed_defaultEntityPlacementDistance;
+}
+
 //////////////////////////////////////////////////////////////////////
 // Viewport drag and drop support
 //////////////////////////////////////////////////////////////////////
 
-void QtViewport::BuildDragDropContext(AzQtComponents::ViewportDragContext& context, const QPoint& pt)
+void QtViewport::BuildDragDropContext(
+    AzQtComponents::ViewportDragContext& context, const AzFramework::ViewportId viewportId, const QPoint& point)
 {
-    context.m_hitLocation = AZ::Vector3::CreateZero();
+    context.m_hitLocation = AzToolsFramework::FindClosestPickIntersection(
-    context.m_hitLocation = GetHitLocation(pt);
+        viewportId, AzToolsFramework::ViewportInteraction::ScreenPointFromQPoint(point), AzToolsFramework::EditorPickRayLength,
+        GetDefaultEntityPlacementDistance());
 }
 
-
 void QtViewport::dragEnterEvent(QDragEnterEvent* event)
 {
     if (!GetIEditor()->GetGameEngine()->IsLevelLoaded())
@@ -66,7 +84,7 @@ void QtViewport::dragEnterEvent(QDragEnterEvent* event)
         // new bus-based way of doing it (install a listener!)
         using namespace AzQtComponents;
         ViewportDragContext context;
-        BuildDragDropContext(context, event->pos());
+        BuildDragDropContext(context, GetViewportId(), event->pos());
         DragAndDropEventsBus::Event(DragAndDropContexts::EditorViewport, &DragAndDropEvents::DragEnter, event, context);
     }
 }
@@ -89,7 +107,7 @@ void QtViewport::dragMoveEvent(QDragMoveEvent* event)
         // new bus-based way of doing it (install a listener!)
         using namespace AzQtComponents;
         ViewportDragContext context;
-        BuildDragDropContext(context, event->pos());
+        BuildDragDropContext(context, GetViewportId(), event->pos());
         DragAndDropEventsBus::Event(DragAndDropContexts::EditorViewport, &DragAndDropEvents::DragMove, event, context);
     }
 }
@@ -112,7 +130,7 @@ void QtViewport::dropEvent(QDropEvent* event)
     {
         // new bus-based way of doing it (install a listener!)
         ViewportDragContext context;
-        BuildDragDropContext(context, event->pos());
+        BuildDragDropContext(context, GetViewportId(), event->pos());
         DragAndDropEventsBus::Event(DragAndDropContexts::EditorViewport, &DragAndDropEvents::Drop, event, context);
     }
 }
@@ -340,13 +358,6 @@ void QtViewport::resizeEvent(QResizeEvent* event)
     Update();
 }
 
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::leaveEvent(QEvent* event)
-{
-    QWidget::leaveEvent(event);
-    MouseCallback(eMouseLeave, QPoint(), Qt::KeyboardModifiers(), Qt::MouseButtons());
-}
-
 //////////////////////////////////////////////////////////////////////////
 void QtViewport::paintEvent([[maybe_unused]] QPaintEvent* event)
 {
@@ -581,63 +592,7 @@ void QtViewport::keyReleaseEvent(QKeyEvent* event)
     OnKeyUp(nativeKey, 1, event->nativeModifiers());
 }
 
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnLButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    // Save the mouse down position
-    m_cMouseDownPos = point;
-
-    if (MouseCallback(eMouseLDown, point, modifiers))
-    {
-        return;
-    }
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnLButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    // Check Edit Tool.
-    MouseCallback(eMouseLUp, point, modifiers);
-}
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnRButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    MouseCallback(eMouseRDown, point, modifiers);
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnRButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    MouseCallback(eMouseRUp, point, modifiers);
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnMButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    // Check Edit Tool.
-    MouseCallback(eMouseMDown, point, modifiers);
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnMButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    // Move the viewer to the mouse location.
-    // Check Edit Tool.
-    MouseCallback(eMouseMUp, point, modifiers);
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnMButtonDblClk(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    MouseCallback(eMouseMDblClick, point, modifiers);
-}
-
 
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnMouseMove(Qt::KeyboardModifiers modifiers, Qt::MouseButtons buttons, const QPoint& point)
-{
-    MouseCallback(eMouseMove, point, modifiers, buttons);
-}
 
 //////////////////////////////////////////////////////////////////////////
 void QtViewport::OnSetCursor()
@@ -696,44 +651,6 @@ void QtViewport::OnDragSelectRectangle(const QRect& rect, bool bNormalizeRect)
     GetIEditor()->SetStatusText(szNewStatusText);
 }
 
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnLButtonDblClk(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    if (GetIEditor()->IsInGameMode())
-    {
-        // Ignore double clicks while in game.
-        return;
-    }
-
-    MouseCallback(eMouseLDblClick, point, modifiers);
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnRButtonDblClk(Qt::KeyboardModifiers modifiers, const QPoint& point)
-{
-    MouseCallback(eMouseRDblClick, point, modifiers);
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnKeyDown([[maybe_unused]] UINT nChar, [[maybe_unused]] UINT nRepCnt, [[maybe_unused]] UINT nFlags)
-{
-    if (GetIEditor()->IsInGameMode())
-    {
-        // Ignore key downs while in game.
-        return;
-    }
-}
-
-//////////////////////////////////////////////////////////////////////////
-void QtViewport::OnKeyUp([[maybe_unused]] UINT nChar, [[maybe_unused]] UINT nRepCnt, [[maybe_unused]] UINT nFlags)
-{
-    if (GetIEditor()->IsInGameMode())
-    {
-        // Ignore key downs while in game.
-        return;
-    }
-}
-
 //////////////////////////////////////////////////////////////////////////
 void QtViewport::SetCurrentCursor(const QCursor& hCursor, const QString& cursorString)
 {
@@ -1119,29 +1036,6 @@ bool QtViewport::HitTest(const QPoint& point, HitContext& hitInfo)
     return false;
 }
 
-AZ::Vector3 QtViewport::GetHitLocation(const QPoint& point)
-{
-    Vec3 pos = Vec3(ZERO);
-    HitContext hit;
-    if (HitTest(point, hit))
-    {
-        pos = hit.raySrc + hit.rayDir * hit.dist;
-        pos = SnapToGrid(pos);
-    }
-    else
-    {
-        bool hitTerrain;
-        pos = ViewToWorld(point, &hitTerrain);
-        if (hitTerrain)
-        {
-            pos.z = GetIEditor()->GetTerrainElevation(pos.x, pos.y);
-        }
-        pos = SnapToGrid(pos);
-    }
-
-    return AZ::Vector3(pos.x, pos.y, pos.z);
-}
-
 //////////////////////////////////////////////////////////////////////////
 void QtViewport::SetZoomFactor(float fZoomFactor)
 {
@@ -1315,84 +1209,6 @@ bool QtViewport::GetAdvancedSelectModeFlag()
     return m_bAdvancedSelectMode;
 }
 
-//////////////////////////////////////////////////////////////////////////
-bool QtViewport::MouseCallback(EMouseEvent event, const QPoint& point, Qt::KeyboardModifiers modifiers, Qt::MouseButtons buttons)
-{
-    AZ_PROFILE_FUNCTION(Editor);
-
-    // Ignore any mouse events in game mode.
-    if (GetIEditor()->IsInGameMode())
-    {
-        return true;
-    }
-
-    // We must ignore mouse events when we are in the middle of an assert.
-    // Reason: If we have an assert called from an engine module under the editor, if we call this function,
-    // it may call the engine again and cause a deadlock.
-    // Concrete example: CryPhysics called from Trackview causing an assert, and moving the cursor over the viewport
-    // would cause the editor to freeze as it calls CryPhysics again for a raycast while it didn't release the lock.
-    if (gEnv->pSystem->IsAssertDialogVisible())
-    {
-        return true;
-    }
-
-    //////////////////////////////////////////////////////////////////////////
-    // Hit test gizmo objects.
-    //////////////////////////////////////////////////////////////////////////
-    bool bAltClick = (modifiers & Qt::AltModifier);
-    bool bCtrlClick = (modifiers & Qt::ControlModifier);
-    bool bShiftClick = (modifiers & Qt::ShiftModifier);
-
-    int flags = (bCtrlClick ? MK_CONTROL : 0) |
-        (bShiftClick ? MK_SHIFT : 0) |
-        ((buttons& Qt::LeftButton) ? MK_LBUTTON : 0) |
-        ((buttons& Qt::MiddleButton) ? MK_MBUTTON : 0) |
-        ((buttons& Qt::RightButton) ? MK_RBUTTON : 0);
-
-    switch (event)
-    {
-    case eMouseMove:
-
-        if (m_nLastUpdateFrame == m_nLastMouseMoveFrame)
-        {
-            // If mouse move event generated in the same frame, ignore it.
-            return false;
-        }
-        m_nLastMouseMoveFrame = m_nLastUpdateFrame;
-
-        // Skip the marker position update if anything is selected, since it is only used
-        // by the info bar which doesn't show the marker when there is an active selection.
-        // This helps a performance issue when calling ViewToWorld (which calls RayWorldIntersection)
-        // on every mouse movement becomes very expensive in scenes with large amounts of entities.
-        CSelectionGroup* selection = GetIEditor()->GetSelection();
-        if (!(buttons & Qt::RightButton) /* && m_nLastUpdateFrame != m_nLastMouseMoveFrame*/ && (selection && selection->IsEmpty()))
-        {
-            //m_nLastMouseMoveFrame = m_nLastUpdateFrame;
-            Vec3 pos = ViewToWorld(point);
-            GetIEditor()->SetMarkerPosition(pos);
-        }
-        break;
-    }
-
-    QPoint tempPoint(point.x(), point.y());
-
-    //////////////////////////////////////////////////////////////////////////
-    // Handle viewport manipulators.
-    //////////////////////////////////////////////////////////////////////////
-    if (!bAltClick)
-    {
-        ITransformManipulator* pManipulator = GetIEditor()->GetTransformManipulator();
-        if (pManipulator)
-        {
-            if (pManipulator->MouseCallback(this, event, tempPoint, flags))
-            {
-                return true;
-            }
-        }
-    }
-
-    return false;
-}
 //////////////////////////////////////////////////////////////////////////
 void QtViewport::ProcessRenderLisneters(DisplayContext& rstDisplayContext)
 {

Code/Editor/Viewport.h

@@ -6,13 +6,12 @@
  *
  */
 
-
 // Description : interface for the CViewport class.
 
-
 #pragma once
 
 #if !defined(Q_MOC_RUN)
+#include <AzFramework/Viewport/ViewportId.h>
 #include <AzToolsFramework/Viewport/ViewportTypes.h>
 #include <AzToolsFramework/ViewportUi/ViewportUiManager.h>
 #include <Cry_Color.h>
@@ -88,6 +87,9 @@ enum EStdCursor
     STD_CURSOR_LAST,
 };
 
+//! The default distance an entity is placed from the camera if there is no intersection
+SANDBOX_API float GetDefaultEntityPlacementDistance();
+
 AZ_PUSH_DISABLE_DLL_EXPORT_BASECLASS_WARNING
 class SANDBOX_API CViewport
     : public IDisplayViewport
@@ -201,7 +203,6 @@ public:
 
     //! Performs hit testing of 2d point in view to find which object hit.
     virtual bool HitTest(const QPoint& point, HitContext& hitInfo) = 0;
-    virtual AZ::Vector3 GetHitLocation(const QPoint& point) = 0;
 
     virtual void MakeConstructionPlane(int axis) = 0;
 
@@ -432,7 +433,6 @@ public:
 
     //! Performs hit testing of 2d point in view to find which object hit.
     bool HitTest(const QPoint& point, HitContext& hitInfo) override;
-    AZ::Vector3 GetHitLocation(const QPoint& point) override;
 
     //! Do 2D hit testing of line in world space.
     // pToCameraDistance is an optional output parameter in which distance from the camera to the line is returned.
@@ -522,9 +522,6 @@ protected:
     void setRenderOverlayVisible(bool);
     bool isRenderOverlayVisible() const;
 
-    // called to process mouse callback inside the viewport.
-    virtual bool MouseCallback(EMouseEvent event, const QPoint& point, Qt::KeyboardModifiers modifiers, Qt::MouseButtons buttons = Qt::NoButton);
-
     void ProcessRenderLisneters(DisplayContext& rstDisplayContext);
 
     void mousePressEvent(QMouseEvent* event) override;
@@ -535,29 +532,29 @@ protected:
     void keyPressEvent(QKeyEvent* event) override;
     void keyReleaseEvent(QKeyEvent* event) override;
     void resizeEvent(QResizeEvent* event) override;
-    void leaveEvent(QEvent* event) override;
-
     void paintEvent(QPaintEvent* event) override;
 
-    virtual void OnMouseMove(Qt::KeyboardModifiers modifiers, Qt::MouseButtons buttons, const QPoint& point);
+    virtual void OnMouseMove(Qt::KeyboardModifiers, Qt::MouseButtons, const QPoint&) {}
-    virtual void OnMouseWheel(Qt::KeyboardModifiers modifiers, short zDelta, const QPoint& pt);
+    virtual void OnMouseWheel(Qt::KeyboardModifiers, short zDelta, const QPoint&);
-    virtual void OnLButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnLButtonDown(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnLButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnLButtonUp(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnRButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnRButtonDown(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnRButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnRButtonUp(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnMButtonDblClk(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnMButtonDblClk(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnMButtonDown(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnMButtonDown(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnMButtonUp(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnMButtonUp(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnLButtonDblClk(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnLButtonDblClk(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnRButtonDblClk(Qt::KeyboardModifiers modifiers, const QPoint& point);
+    virtual void OnRButtonDblClk(Qt::KeyboardModifiers, const QPoint&) {}
-    virtual void OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags);
+    virtual void OnKeyDown([[maybe_unused]] UINT nChar, [[maybe_unused]] UINT nRepCnt, [[maybe_unused]] UINT nFlags) {}
-    virtual void OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags);
+    virtual void OnKeyUp([[maybe_unused]] UINT nChar, [[maybe_unused]] UINT nRepCnt, [[maybe_unused]] UINT nFlags) {}
 #if defined(AZ_PLATFORM_WINDOWS)
     void OnRawInput(UINT wParam, HRAWINPUT lParam);
 #endif
     void OnSetCursor();
 
-    virtual void BuildDragDropContext(AzQtComponents::ViewportDragContext& context, const QPoint& pt);
+    virtual void BuildDragDropContext(
+        AzQtComponents::ViewportDragContext& context, AzFramework::ViewportId viewportId, const QPoint& point);
+
     void dragEnterEvent(QDragEnterEvent* event) override;
     void dragMoveEvent(QDragMoveEvent* event) override;
     void dragLeaveEvent(QDragLeaveEvent* event) override;

Code/Framework/AzToolsFramework/AzToolsFramework/Viewport/ViewportMessages.cpp

@@ -6,6 +6,7 @@
  *
  */
 
+#include <AzFramework/Render/IntersectorInterface.h>
 #include <AzToolsFramework/Viewport/ViewportMessages.h>
 
 namespace AzToolsFramework
@@ -62,4 +63,33 @@ namespace AzToolsFramework
 
         return circleBoundWidth;
     }
+
+    AZ::Vector3 FindClosestPickIntersection(
+        AzFramework::ViewportId viewportId, const AzFramework::ScreenPoint& screenPoint, const float rayLength, const float defaultDistance)
+    {
+        using AzToolsFramework::ViewportInteraction::ViewportInteractionRequestBus;
+        AzToolsFramework::ViewportInteraction::ProjectedViewportRay viewportRay{};
+        ViewportInteractionRequestBus::EventResult(
+            viewportRay, viewportId, &ViewportInteractionRequestBus::Events::ViewportScreenToWorldRay, screenPoint);
+
+        AzFramework::RenderGeometry::RayRequest ray;
+        ray.m_startWorldPosition = viewportRay.origin;
+        ray.m_endWorldPosition = viewportRay.origin + viewportRay.direction * rayLength;
+        ray.m_onlyVisible = true;
+
+        AzFramework::RenderGeometry::RayResult renderGeometryIntersectionResult;
+        AzFramework::RenderGeometry::IntersectorBus::EventResult(
+            renderGeometryIntersectionResult, AzToolsFramework::GetEntityContextId(),
+            &AzFramework::RenderGeometry::IntersectorBus::Events::RayIntersect, ray);
+
+        // attempt a ray intersection with any visible mesh and return the intersection position if successful
+        if (renderGeometryIntersectionResult)
+        {
+            return renderGeometryIntersectionResult.m_worldPosition;
+        }
+        else
+        {
+            return viewportRay.origin + viewportRay.direction * defaultDistance;
+        }
+    }
 } // namespace AzToolsFramework

Code/Framework/AzToolsFramework/AzToolsFramework/Viewport/ViewportMessages.h

@@ -334,6 +334,12 @@ namespace AzToolsFramework
         return entityContextId;
     }
 
+    //! Performs an intersection test against meshes in the scene, if there is a hit (the ray intersects
+    //! a mesh), that position is returned, otherwise a point projected defaultDistance from the
+    //! origin of the ray will be returned.
+    AZ::Vector3 FindClosestPickIntersection(
+        AzFramework::ViewportId viewportId, const AzFramework::ScreenPoint& screenPoint, float rayLength, float defaultDistance);
+
     //! Maps a mouse interaction event to a ClickDetector event.
     //! @note Function only cares about up or down events, all other events are mapped to Nil (ignored).
     AzFramework::ClickDetector::ClickEvent ClickDetectorEventFromViewportInteraction(

Code/Framework/AzToolsFramework/AzToolsFramework/ViewportSelection/EditorSelectionUtil.cpp

@@ -18,9 +18,6 @@
 
 namespace AzToolsFramework
 {
-    // default ray length for picking in the viewport
-    static const float EditorPickRayLength = 1000.0f;
-
     AZ::Vector3 CalculateCenterOffset(const AZ::EntityId entityId, const EditorTransformComponentSelectionRequests::Pivot pivot)
     {
         if (Centered(pivot))

Code/Framework/AzToolsFramework/AzToolsFramework/ViewportSelection/EditorSelectionUtil.h

@@ -26,6 +26,9 @@ namespace AzFramework
 
 namespace AzToolsFramework
 {
+    //! Default ray length for picking in the viewport.
+    inline constexpr float EditorPickRayLength = 1000.0f;
+
     //! Is the pivot at the center of the object (middle of extents) or at the
     //! exported authored object root position.
     inline bool Centered(const EditorTransformComponentSelectionRequests::Pivot pivot)