Fix track view bug where postfxs do not render correctly. (#5465)

* Fix track view bug where postfxs do not render correctly.

Signed-off-by: hershey5045 <43485729+hershey5045@users.noreply.github.com>

* Reduce scope and add comments.

Signed-off-by: hershey5045 <43485729+hershey5045@users.noreply.github.com>

Code/Editor/TrackView/AtomOutputFrameCapture.cpp

@@ -13,6 +13,7 @@
 #include <Atom/RPI.Public/Scene.h>
 #include <Atom/RPI.Public/View.h>
 #include <Atom/RPI.Reflect/System/RenderPipelineDescriptor.h>
+#include <PostProcess/PostProcessFeatureProcessor.h>
 #include <AzCore/Component/TransformBus.h>
 #include <AzCore/Math/MatrixUtils.h>
 #include <AzCore/Name/Name.h>
@@ -47,18 +48,42 @@ namespace TrackView
         AZ::Name viewName = AZ::Name("MainCamera");
         m_view = AZ::RPI::View::CreateView(viewName, AZ::RPI::View::UsageCamera);
         m_renderPipeline->SetDefaultView(m_view);
+        m_targetView = scene.GetDefaultRenderPipeline()->GetDefaultView();
+        if (AZ::Render::PostProcessFeatureProcessor* fp = scene.GetFeatureProcessor<AZ::Render::PostProcessFeatureProcessor>())
+        {
+            // This will be set again to mimic the active camera in UpdateView
+            fp->SetViewAlias(m_view, m_targetView);
+        }
     }
 
     void AtomOutputFrameCapture::DestroyPipeline(AZ::RPI::Scene& scene)
     {
+        if (AZ::Render::PostProcessFeatureProcessor* fp = scene.GetFeatureProcessor<AZ::Render::PostProcessFeatureProcessor>())
+        {
+            // Remove view alias introduced in CreatePipeline and UpdateView
+            fp->RemoveViewAlias(m_view);
+        }
         scene.RemoveRenderPipeline(m_renderPipeline->GetId());
         m_passHierarchy.clear();
         m_renderPipeline.reset();
         m_view.reset();
+        m_targetView.reset();
     }
 
-    void AtomOutputFrameCapture::UpdateView(const AZ::Matrix3x4& cameraTransform, const AZ::Matrix4x4& cameraProjection)
+    void AtomOutputFrameCapture::UpdateView(const AZ::Matrix3x4& cameraTransform, const AZ::Matrix4x4& cameraProjection, const AZ::RPI::ViewPtr targetView)
     {
+        if (targetView && targetView != m_targetView)
+        {
+            if (AZ::RPI::Scene* scene = SceneFromGameEntityContext())
+            {
+                if (AZ::Render::PostProcessFeatureProcessor* fp = scene->GetFeatureProcessor<AZ::Render::PostProcessFeatureProcessor>())
+                {
+                    fp->SetViewAlias(m_view, targetView);
+                    m_targetView = targetView;
+                }
+            }
+        }
+
         m_view->SetCameraTransform(cameraTransform);
         m_view->SetViewToClipMatrix(cameraProjection);
     }

Code/Editor/TrackView/AtomOutputFrameCapture.h

@@ -39,11 +39,12 @@ namespace TrackView
             CaptureFinishedCallback captureFinishedCallback);
 
         //! Update the internal view that is associated with the created pipeline.
-        void UpdateView(const AZ::Matrix3x4& cameraTransform, const AZ::Matrix4x4& cameraProjection);
+        void UpdateView(const AZ::Matrix3x4& cameraTransform, const AZ::Matrix4x4& cameraProjection, const AZ::RPI::ViewPtr targetView = nullptr);
 
     private:
         AZ::RPI::RenderPipelinePtr m_renderPipeline; //!< The internal render pipeline.
         AZ::RPI::ViewPtr m_view; //!< The view associated with the render pipeline.
+        AZ::RPI::ViewPtr m_targetView; //!< The view that this render pipeline will mimic.
         AZStd::vector<AZStd::string> m_passHierarchy; //!< Pass hierarchy (includes pipelineName and CopyToSwapChain).
         CaptureFinishedCallback m_captureFinishedCallback; //!< Stored callback called from OnCaptureFinished.
 

Code/Editor/TrackView/SequenceBatchRenderDialog.cpp

@@ -16,6 +16,7 @@
 
 #include <AzCore/Component/ComponentApplication.h>
 #include <AzFramework/Windowing/WindowBus.h>
+#include <Atom/RPI.Public/ViewProviderBus.h>
 
 // Qt
 #include <QAction>
@@ -91,9 +92,12 @@ namespace
 static void UpdateAtomOutputFrameCaptureView(TrackView::AtomOutputFrameCapture& atomOutputFrameCapture, const int width, const int height)
 {
     const AZ::EntityId activeCameraEntityId = TrackView::ActiveCameraEntityId();
+    AZ::RPI::ViewPtr view = nullptr;
+    AZ::RPI::ViewProviderBus::EventResult(view, activeCameraEntityId, &AZ::RPI::ViewProvider::GetView);
     atomOutputFrameCapture.UpdateView(
         TrackView::TransformFromEntityId(activeCameraEntityId),
-        TrackView::ProjectionFromCameraEntityId(activeCameraEntityId, static_cast<float>(width), static_cast<float>(height)));
+        TrackView::ProjectionFromCameraEntityId(activeCameraEntityId, aznumeric_cast<float>(width), aznumeric_cast<float>(height)),
+        view);
 }
 
 CSequenceBatchRenderDialog::CSequenceBatchRenderDialog(float fps, QWidget* pParent /* = nullptr */)