C++ FSceneView::StartFinalPostprocessSettings方法代码示例

FSceneView* FJavascriptUMGViewportClient::CalcSceneView(FSceneViewFamily* ViewFamily)
{
	FSceneViewInitOptions ViewInitOptions;

	const FVector& ViewLocation = GetViewLocation();
	const FRotator& ViewRotation = GetViewRotation();

	const FIntPoint ViewportSizeXY = Viewport->GetSizeXY();

	FIntRect ViewRect = FIntRect(0, 0, ViewportSizeXY.X, ViewportSizeXY.Y);
	ViewInitOptions.SetViewRectangle(ViewRect);

	ViewInitOptions.ViewOrigin = ViewLocation;

	ViewInitOptions.ViewRotationMatrix = FInverseRotationMatrix(ViewRotation);
	ViewInitOptions.ViewRotationMatrix = ViewInitOptions.ViewRotationMatrix * FMatrix(
		FPlane(0, 0, 1, 0),
		FPlane(1, 0, 0, 0),
		FPlane(0, 1, 0, 0),
		FPlane(0, 0, 0, 1));

	//@TODO: Should probably be locally configurable (or just made into a FMinimalViewInfo property)
	const EAspectRatioAxisConstraint AspectRatioAxisConstraint = GetDefault<ULocalPlayer>()->AspectRatioAxisConstraint;

	FMinimalViewInfo::CalculateProjectionMatrixGivenView(ViewInfo, AspectRatioAxisConstraint, Viewport, /*inout*/ ViewInitOptions);

	ViewInitOptions.ViewFamily = ViewFamily;
	ViewInitOptions.SceneViewStateInterface = ViewState.GetReference();
	ViewInitOptions.ViewElementDrawer = this;

	ViewInitOptions.BackgroundColor = GetBackgroundColor();

	//ViewInitOptions.EditorViewBitflag = 0, // send the bit for this view - each actor will check it's visibility bits against this

	// for ortho views to steal perspective view origin
	//ViewInitOptions.OverrideLODViewOrigin = FVector::ZeroVector;
	//ViewInitOptions.bUseFauxOrthoViewPos = true;

	//ViewInitOptions.CursorPos = CurrentMousePos;

	FSceneView* View = new FSceneView(ViewInitOptions);

	ViewFamily->Views.Add(View);

	View->StartFinalPostprocessSettings(ViewLocation);

	//OverridePostProcessSettings(*View);

	View->EndFinalPostprocessSettings(ViewInitOptions);

	return View;
}

FSceneRenderer* FScene::CreateSceneRenderer( USceneCaptureComponent* SceneCaptureComponent, UTextureRenderTarget* TextureTarget, const FMatrix& ViewMatrix, const FVector& ViewLocation, float FOV, float MaxViewDistance, bool bCaptureSceneColour, FPostProcessSettings* PostProcessSettings, float PostProcessBlendWeight )
{
	FIntPoint CaptureSize(TextureTarget->GetSurfaceWidth(), TextureTarget->GetSurfaceHeight());

	FTextureRenderTargetResource* Resource = TextureTarget->GameThread_GetRenderTargetResource();
	FSceneViewFamilyContext ViewFamily(FSceneViewFamily::ConstructionValues(
		Resource,
		this,
		FEngineShowFlags(ESFIM_Game))
		.SetResolveScene(!bCaptureSceneColour));

	// Disable features that are not desired when capturing the scene
	ViewFamily.EngineShowFlags.MotionBlur = 0; // motion blur doesn't work correctly with scene captures.
	ViewFamily.EngineShowFlags.SeparateTranslucency = 0;
	ViewFamily.EngineShowFlags.HMDDistortion = 0;
	FSceneViewInitOptions ViewInitOptions;
	ViewInitOptions.SetViewRectangle(FIntRect(0, 0, CaptureSize.X, CaptureSize.Y));
	ViewInitOptions.ViewFamily = &ViewFamily;
	ViewInitOptions.ViewMatrix = ViewMatrix;
	ViewInitOptions.BackgroundColor = FLinearColor::Black;
	ViewInitOptions.OverrideFarClippingPlaneDistance = MaxViewDistance;

	if (bCaptureSceneColour)
	{
		ViewFamily.EngineShowFlags.PostProcessing = 0;
		ViewInitOptions.OverlayColor = FLinearColor::Black;
	}

	// Build projection matrix
	{
		float XAxisMultiplier;
		float YAxisMultiplier;

		if (CaptureSize.X > CaptureSize.Y)
		{
			// if the viewport is wider than it is tall
			XAxisMultiplier = 1.0f;
			YAxisMultiplier = CaptureSize.X / (float)CaptureSize.Y;
		}
		else
		{
			// if the viewport is taller than it is wide
			XAxisMultiplier = CaptureSize.Y / (float)CaptureSize.X;
			YAxisMultiplier = 1.0f;
		}

		ViewInitOptions.ProjectionMatrix = FReversedZPerspectiveMatrix (
			FOV,
			FOV,
			XAxisMultiplier,
			YAxisMultiplier,
			GNearClippingPlane,
			GNearClippingPlane
			);
	}

	FSceneView* View = new FSceneView(ViewInitOptions);

	View->bIsSceneCapture = true;

	check(SceneCaptureComponent);
	for (auto It = SceneCaptureComponent->HiddenComponents.CreateConstIterator(); It; ++It)
	{
		// If the primitive component was destroyed, the weak pointer will return NULL.
		UPrimitiveComponent* PrimitiveComponent = It->Get();
		if (PrimitiveComponent)
		{
			View->HiddenPrimitives.Add(PrimitiveComponent->ComponentId);
		}
	}

	ViewFamily.Views.Add(View);

	View->StartFinalPostprocessSettings(ViewLocation);
	if (!bCaptureSceneColour)
	{
		View->OverridePostProcessSettings(*PostProcessSettings, PostProcessBlendWeight);
	}
	View->EndFinalPostprocessSettings();

	return FSceneRenderer::CreateSceneRenderer(&ViewFamily, NULL);
}

void FThumbnailPreviewScene::GetView(FSceneViewFamily* ViewFamily, int32 X, int32 Y, uint32 SizeX, uint32 SizeY) const
{
    check(ViewFamily);

    FIntRect ViewRect(
        FMath::Max<int32>(X,0),
        FMath::Max<int32>(Y,0),
        FMath::Max<int32>(X+SizeX,0),
        FMath::Max<int32>(Y+SizeY,0));

    if (ViewRect.Width() > 0 && ViewRect.Height() > 0)
    {
        const float FOVDegrees = 30.f;
        const float HalfFOVRadians = FMath::DegreesToRadians<float>(FOVDegrees) * 0.5f;
        static_assert((int32)ERHIZBuffer::IsInverted != 0, "Check NearPlane and Projection Matrix");
        const float NearPlane = 1.0f;
        FMatrix ProjectionMatrix = FReversedZPerspectiveMatrix(
                                       HalfFOVRadians,
                                       1.0f,
                                       1.0f,
                                       NearPlane
                                   );

        FVector Origin(0);
        float OrbitPitch = 0;
        float OrbitYaw = 0;
        float OrbitZoom = 0;
        GetViewMatrixParameters(FOVDegrees, Origin, OrbitPitch, OrbitYaw, OrbitZoom);

        // Ensure a minimum camera distance to prevent problems with really small objects
        const float MinCameraDistance = 48;
        OrbitZoom = FMath::Max<float>(MinCameraDistance, OrbitZoom);

        const FRotator RotationOffsetToViewCenter(0.f, 90.f, 0.f);
        FMatrix ViewRotationMatrix = FRotationMatrix( FRotator(0, OrbitYaw, 0) ) *
                                     FRotationMatrix( FRotator(0, 0, OrbitPitch) ) *
                                     FTranslationMatrix( FVector(0, OrbitZoom, 0) ) *
                                     FInverseRotationMatrix( RotationOffsetToViewCenter );

        ViewRotationMatrix = ViewRotationMatrix * FMatrix(
                                 FPlane(0,	0,	1,	0),
                                 FPlane(1,	0,	0,	0),
                                 FPlane(0,	1,	0,	0),
                                 FPlane(0,	0,	0,	1));

        Origin -= ViewRotationMatrix.InverseTransformPosition( FVector::ZeroVector );
        ViewRotationMatrix = ViewRotationMatrix.RemoveTranslation();

        FSceneViewInitOptions ViewInitOptions;
        ViewInitOptions.ViewFamily = ViewFamily;
        ViewInitOptions.SetViewRectangle(ViewRect);
        ViewInitOptions.ViewOrigin = -Origin;
        ViewInitOptions.ViewRotationMatrix = ViewRotationMatrix;
        ViewInitOptions.ProjectionMatrix = ProjectionMatrix;
        ViewInitOptions.BackgroundColor = FLinearColor::Black;

        FSceneView* NewView = new FSceneView(ViewInitOptions);

        ViewFamily->Views.Add(NewView);

        NewView->StartFinalPostprocessSettings( ViewInitOptions.ViewOrigin );
        NewView->EndFinalPostprocessSettings(ViewInitOptions);

        FFinalPostProcessSettings::FCubemapEntry& CubemapEntry = *new(NewView->FinalPostProcessSettings.ContributingCubemaps) FFinalPostProcessSettings::FCubemapEntry;
        CubemapEntry.AmbientCubemap = GUnrealEd->GetThumbnailManager()->AmbientCubemap;
        const float AmbientCubemapIntensity = 1.69;
        CubemapEntry.AmbientCubemapTintMulScaleValue = FLinearColor::White * AmbientCubemapIntensity;

        // Tell the texture streaming system about this thumbnail view, so the textures will stream in as needed
        // NOTE: Sizes may not actually be in screen space depending on how the thumbnail ends up stretched by the UI.  Not a big deal though.
        // NOTE: Textures still take a little time to stream if the view has not been re-rendered recently, so they may briefly appear blurry while mips are prepared
        // NOTE: Content Browser only renders thumbnails for loaded assets, and only when the mouse is over the panel. They'll be frozen in their last state while the mouse cursor is not over the panel.  This is for performance reasons
        IStreamingManager::Get().AddViewInformation( Origin, SizeX, SizeX / FMath::Tan( FOVDegrees ) );
    }
}