AnimNode_RotationMultiplier.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "BoneContainer.h"
#include "BonePose.h"
#include "BoneControllers/AnimNode_SkeletalControlBase.h"
#include "AnimNode_RotationMultiplier.generated.h"
 
class USkeletalMeshComponent;
 
USTRUCT(BlueprintInternalUseOnly)
struct FAnimNode_RotationMultiplier : public FAnimNode_SkeletalControlBase
{
    GENERATED_USTRUCT_BODY()
 
    
    UPROPERTY(EditAnywhere, Category=Multiplier) 
    FBoneReference  TargetBone;
 
    UPROPERTY(EditAnywhere, Category=Multiplier)
    FBoneReference  SourceBone;
 
    // To make these to be easily pin-hookable, I'm not making it struct, but each variable
    // 0.f is invalid, and default
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Multiplier, meta=(PinShownByDefault))
    float   Multiplier;
 
    UPROPERTY(EditAnywhere, Category=Multiplier)
    TEnumAsByte<EBoneAxis> RotationAxisToRefer;
    
    UPROPERTY(EditAnywhere, Category = Multiplier)
    bool bIsAdditive;   
 
    ANIMGRAPHRUNTIME_API FAnimNode_RotationMultiplier();
 
    // FAnimNode_Base interface
    ANIMGRAPHRUNTIME_API virtual void GatherDebugData(FNodeDebugData& DebugData) override;
    // End of FAnimNode_Base interface
 
    // FAnimNode_SkeletalControlBase interface
    ANIMGRAPHRUNTIME_API virtual void EvaluateSkeletalControl_AnyThread(FComponentSpacePoseContext& Output, TArray<FBoneTransform>& OutBoneTransforms) override;
    ANIMGRAPHRUNTIME_API virtual bool IsValidToEvaluate(const USkeleton* Skeleton, const FBoneContainer& RequiredBones) override;
    // End of FAnimNode_SkeletalControlBase interface
 
private:
    // Extract Delta Quat of rotation around Axis of animation and reference pose for the SourceBoneIndex
    FQuat ExtractAngle(const FTransform& RefPoseTransform, const FTransform& LocalBoneTransform, const EBoneAxis Axis);
    // Multiply scalar value Multiplier to the delta Quat of SourceBone Index's rotation
    FQuat MultiplyQuatBasedOnSourceIndex(const FTransform& RefPoseTransform, const FTransform& LocalBoneTransform, const EBoneAxis Axis, float InMultiplier, const FQuat& ReferenceQuat);
 
    // FAnimNode_SkeletalControlBase interface
    ANIMGRAPHRUNTIME_API virtual void InitializeBoneReferences(const FBoneContainer& RequiredBones) override;
    // End of FAnimNode_SkeletalControlBase interface
};