static TAutoConsoleVariable<int32> CVarMotionBlurDebug(
	TEXT("r.MotionBlurDebug"),
	0,
	TEXT("Defines if we log debugging output for motion blur rendering.\n")
	TEXT(" 0: off (default)\n")
	TEXT(" 1: on"),
	ECVF_Cheat | ECVF_RenderThreadSafe);

file
function     FScreenPassTextureSlice AddVisualizeMotionBlurPass
lambda-function

		Canvas.DrawShadowedString(X, Y += YStep, *Line, GetStatsFont(), FLinearColor(1, 1, 0));

		static const auto MotionBlurDebugVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.MotionBlurDebug"));
		const int32 MotionBlurDebug = MotionBlurDebugVar ? MotionBlurDebugVar->GetValueOnRenderThread() : 0;

		Line = FString::Printf(TEXT("%d, %d"), View.Family->FrameNumber, MotionBlurDebug);
		Canvas.DrawShadowedString(X, Y += YStep, TEXT("FrameNo, r.MotionBlurDebug:"), GetStatsFont(), FLinearColor(1, 1, 0));
		Canvas.DrawShadowedString(X + ColumnWidth, Y, *Line, GetStatsFont(), FLinearColor(1, 1, 0));

		static const auto VelocityTestVar = IConsoleManager::Get().FindTConsoleVariableDataInt(TEXT("r.VelocityTest"));
		const int32 VelocityTest = VelocityTestVar ? VelocityTestVar->GetValueOnRenderThread() : 0;

		Line = FString::Printf(TEXT("%d, %d, %d"), View.Family->bWorldIsPaused, VelocityTest, FVelocityRendering::IsParallelVelocity(View.GetShaderPlatform()));
		Canvas.DrawShadowedString(X, Y += YStep, TEXT("Paused, r.VelocityTest, Parallel:"), GetStatsFont(), FLinearColor(1, 1, 0));
		Canvas.DrawShadowedString(X + ColumnWidth, Y, *Line, GetStatsFont(), FLinearColor(1, 1, 0));

		const FSceneViewState *SceneViewState = (const FSceneViewState*)View.State;

		Line = FString::Printf(TEXT("View=%.4x PrevView=%.4x"),
			View.ViewMatrices.GetViewMatrix().ComputeHash() & 0xffff,
			View.PrevViewInfo.ViewMatrices.GetViewMatrix().ComputeHash() & 0xffff);
		Canvas.DrawShadowedString(X, Y += YStep, TEXT("ViewMatrix:"), GetStatsFont(), FLinearColor(1, 1, 0));
		Canvas.DrawShadowedString(X + ColumnWidth, Y, *Line, GetStatsFont(), FLinearColor(1, 1, 0));
	});

	return FScreenPassTextureSlice::CreateFromScreenPassTexture(GraphBuilder, Output);
}

FMotionBlurOutputs AddMotionBlurPass(FRDGBuilder& GraphBuilder, const FViewInfo& View, const FMotionBlurInputs& Inputs)
{
	check(Inputs.SceneColor.IsValid());
	check(Inputs.SceneDepth.IsValid());
	check(Inputs.SceneVelocity.IsValid());
	checkf(Inputs.SceneDepth.ViewRect == Inputs.SceneVelocity.ViewRect, TEXT("The motion blur depth and velocity must have the same viewport."));
	checkf(!Inputs.OverrideOutput.IsValid(), TEXT("The motion blur override output support is unimplemented."));

	// NOTE: Use SceneDepth as the velocity viewport because SceneVelocity can actually be a 1x1 black texture when there are no moving objects in sight.
	const FMotionBlurViewports Viewports(FScreenPassTextureViewport(Inputs.SceneColor), FScreenPassTextureViewport(Inputs.SceneDepth));

	RDG_EVENT_SCOPE(GraphBuilder, "MotionBlur");
	RDG_GPU_STAT_SCOPE(GraphBuilder, MotionBlur);

	FRDGTextureRef VelocityFlatTexture = nullptr;