MovieSceneMotionVectorSimulationSystem.h

Go to the documentation of this file.

// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "EntitySystem/MovieSceneEntitySystem.h"
#include "Math/Transform.h"
#include "Containers/Map.h"
#include "UObject/ObjectKey.h"
#include "UObject/NameTypes.h"
 
#include "MovieSceneMotionVectorSimulationSystem.generated.h"
 
struct FMovieSceneAnimTypeID;
 
namespace UE
{
namespace MovieScene
{
 
 
FFrameTime GetSimulatedMotionVectorTime(const FMovieSceneContext& Context);
 
 
} // namespace MovieScene
} // namespace UE
 
UCLASS(MinimalAPI)
class UMovieSceneMotionVectorSimulationSystem : public UMovieSceneEntitySystem
{
public:
 
    GENERATED_BODY()
 
    MOVIESCENETRACKS_API UMovieSceneMotionVectorSimulationSystem(const FObjectInitializer& ObjInit);
 
    MOVIESCENETRACKS_API void EnableThisFrame();
    MOVIESCENETRACKS_API void SimulateAllTransforms();
    bool IsSimulationEnabled() const
    {
        return bSimulationEnabled;
    }
 
    MOVIESCENETRACKS_API void PreserveSimulatedMotion(bool bShouldPreserveTransforms);
 
    MOVIESCENETRACKS_API void AddSimulatedTransform(USceneComponent* Component, const FTransform& SimulatedTransform, FName SocketName);
 
private:
 
    MOVIESCENETRACKS_API virtual bool IsRelevantImpl(UMovieSceneEntitySystemLinker* InLinker) const override;
    MOVIESCENETRACKS_API virtual void OnRun(FSystemTaskPrerequisites& InPrerequisites, FSystemSubsequentTasks& Subsequents) override final;
 
    MOVIESCENETRACKS_API void OnPostEvaluation();
 
    MOVIESCENETRACKS_API void ComputeSimulatedMotion();
 
private:
 
    MOVIESCENETRACKS_API void PropagateMotionToComponents();
 
    MOVIESCENETRACKS_API FTransform GetTransform(USceneComponent* Component);
 
    MOVIESCENETRACKS_API FTransform GetSocketTransform(USceneComponent* Component, FName SocketName);
 
    MOVIESCENETRACKS_API bool HavePreviousTransformForParent(USceneComponent* InComponent) const;
 
    MOVIESCENETRACKS_API void ApplySimulatedTransforms(USceneComponent* InComponent, const FTransform& InPreviousTransform);
 
private:
 
    struct FSimulatedTransform
    {
        FSimulatedTransform(const FTransform& InTransform, FName InSocketName = NAME_None)
            : Transform(InTransform), SocketName(InSocketName)
        {}
 
        FTransform Transform;
 
        FName SocketName;
    };
 
    TMultiMap<FObjectKey, FSimulatedTransform> TransformData;
 
    bool bPreserveTransforms = false;
 
    bool bSimulationEnabled = false;
 
    bool bSimulateTransformsRequested = false;
};