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目的：在AnimationBlueprint中使用自定義動畫控制節(jié)點。

主要過程：

1.      引用相關(guān)模塊。在Client.Build.cs文件中，PublicDependencyModuleNames.AddRange里加入”AnimGraphRuntime”,“AnimGraph”, “BlueprintGraph”，添加引用模塊后可在使用時直接包含頭文件名稱，而不用指定具體路徑。

2.      實現(xiàn)AnimNode類，用于處理更新骨骼位置等具體邏輯；

3.      實現(xiàn)AnimGraphNode類，用于在編輯器中顯示信息等；

4.      編輯工程后即可在AnimationBlueprint中使用該節(jié)點

下面以我的自定義動畫節(jié)點CopyParentBone為例，該節(jié)點作用是更改當(dāng)前Component內(nèi)某骨骼的Transform為Parent Component內(nèi)同名稱骨骼的Transform：

一、添加引用模塊

Client.Build.cs

PublicDependencyModuleNames.AddRange(new string[]   
        {   
            "Core",   
            "CoreUObject",   
            "Engine",   
            "InputCore",  
            "AIModule",  
            "GameplayTasks",  
            "Landscape",  
            "Foliage",  
            "AnimGraphRuntime",  
            "AnimGraph",  
            "BlueprintGraph"  
        });  

二、AnimNode類

Public/AnimNode_CopyParentBone.h

/* 
 * \file AnimNode_CopyParentBone.h 
 * 
 * \author: Jia Zhipeng 
 * \date: 2016/02/24  
 */  
  
#pragma once  
#include "AnimNode_SkeletalControlBase.h"  
#include "AnimNode_CopyParentBone.generated.h"  
  
USTRUCT()  
struct FAnimNode_CopyParentBone :public FAnimNode_SkeletalControlBase  
//父類可以是FAnimNode_SkeletalControlBase或者FAnimNode_Base  
//FAnimNode_SkeletalControlBase一般用于對骨骼的控制，通過EvaluateBoneTransforms更改骨骼位置。  
//FAnimNode_Base一般用于對整體MeshBase的更改，通過Evaluate或者EvaluateComponentSpace更改Output.Pose更改全身的位置  
//自定義類繼承父類后，override部分接口即可，以下是我用到的主要接口  
{  
    GENERATED_USTRUCT_BODY()  
  
    /** Name of bone to control. **/  
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = SkeletalControl)  
    FBoneReference BoneToModify;  
      
public:  
    //  Constructor  
    FAnimNode_CopyParentBone();  
  
//  // FAnimNode_Base interface  
//  顯示Debug信息  
    virtual void GatherDebugData(FNodeDebugData& DebugData) override;  
//  // End of FAnimNode_Base interface  
  
    // FAnimNode_SkeletalControlBase interface  
//  更改位置的邏輯實現(xiàn)函數(shù)  
    virtual void EvaluateBoneTransforms(USkeletalMeshComponent* SkelComp, FCSPose<FCompactPose>& MeshBases, TArray<FBoneTransform>& OutBoneTransforms) override;  
//  判斷用到的骨骼是否有效   
virtual bool IsValidToEvaluate(const USkeleton* Skeleton, const FBoneContainer& RequiredBones) override;  
    // End of FAnimNode_SkeletalControlBase interface  
  
private:  
    // FAnimNode_SkeletalControlBase interface  
//  初始化骨骼引用  
    virtual void InitializeBoneReferences(const FBoneContainer& RequiredBones) override;  
    // End of FAnimNode_SkeletalControlBase interface  
};

Private/AnimNode_CopyParentBone.cpp

/* 
 * \file AnimNode_CopyParentBone.cpp 
 * 
 * \author: Jia Zhipeng 
 * \date: 2016/02/24  
 */  
  
#include "Client.h"http://自己的Game.h  
#include "AnimNode_CopyParentBone.h"  
  
FAnimNode_CopyParentBone::FAnimNode_CopyParentBone()  
{  
      
}  
  
//控制骨骼運動的邏輯實現(xiàn)。在OutBoneTransforms里Add需要修改的BoneTransform  
void FAnimNode_CopyParentBone::EvaluateBoneTransforms(USkeletalMeshComponent* SkelComp, FCSPose<FCompactPose>& MeshBases, TArray<FBoneTransform>& OutBoneTransforms)  
{  
    check(OutBoneTransforms.Num() == 0);  
    FTransform NewBoneTM = FTransform::Identity;  
    const FBoneContainer BoneContainer = MeshBases.GetPose().GetBoneContainer();  
      
    USceneComponent* ParentComponent = SkelComp->GetAttachParent();  
    if (ParentComponent)  
        NewBoneTM = ParentComponent->GetSocketTransform(BoneToModify.BoneName, RTS_Component);  
    else  
    {  
        UE_LOG(LogAnimation, Warning, TEXT("FAnimNode_CopyParentBone cannot get parent component"));  
    }  
    OutBoneTransforms.Add(FBoneTransform(BoneToModify.GetCompactPoseIndex(BoneContainer), NewBoneTM));  
}  
  
void FAnimNode_CopyParentBone::GatherDebugData(FNodeDebugData& DebugData)  
{  
    FString DebugLine = DebugData.GetNodeName(this);  
  
    DebugLine += "(";  
    AddDebugNodeData(DebugLine);  
    DebugLine += FString::Printf(TEXT(" Target: %s)"), * BoneToModify.BoneName.ToString());  
    DebugData.AddDebugItem(DebugLine);  
  
    ComponentPose.GatherDebugData(DebugData);  
}  
  
bool FAnimNode_CopyParentBone::IsValidToEvaluate(const USkeleton* Skeleton, const FBoneContainer& RequiredBones)  
{  
    return (BoneToModify.IsValid(RequiredBones));  
}  
  
void FAnimNode_CopyParentBone::InitializeBoneReferences(const FBoneContainer& RequiredBones)  
{  
    BoneToModify.Initialize(RequiredBones);  
}  

三、AnimGraphNode

Public/AnimGraphNode_CopyParentBone.h

/* 
 * \file AnimGraphNode_CopyParentBone.h 
 * 
 * \author: Jia Zhipeng 
 * \date: 2016/02/24 
 * \purporse: 自定義動畫節(jié)點，在Parent Component中獲得與當(dāng)前Component的根骨骼同名的骨骼Transform，然后設(shè)置為當(dāng)前骨骼的Transform 
 */  
#pragma once  
#include "AnimGraphNode_SkeletalControlBase.h"  
#include "AnimNode_CopyParentBone.h"  
#include "AnimGraphNode_CopyParentBone.generated.h"  
  
UCLASS(MinimalAPI)  
class UAnimGraphNode_CopyParentBone : public UAnimGraphNode_SkeletalControlBase  
{  
    GENERATED_UCLASS_BODY()  
  
    UPROPERTY(EditAnywhere, Category=Settings)  
    FAnimNode_CopyParentBone Node;  
  
    // UEdGraphNode interface  
//  鼠標(biāo)懸浮在Node上的提示文本  
    virtual FText GetTooltipText() const override;  
//  Node的名字文本     
virtual FText GetNodeTitle(ENodeTitleType::Type TitleType) const override;  
    // End of UEdGraphNode interface  
  
protected:  
    // UAnimGraphNode_SkeletalControlBase interface  
//  返回controller的描述  
    virtual FText GetControllerDescription() const override;  
//  返回引用的AnimNode  
    virtual const FAnimNode_SkeletalControlBase* GetNode() const override { return &Node; }  
    // End of UAnimGraphNode_SkeletalControlBase interface  
      
};  

Private/AnimGraphNode_CopyParenBone.cpp

/* 
 * \file AnimNode_CopyParentBone.cpp 
 * 
 * \author: Jia Zhipeng 
 * \date: 2016/02/24  
 */  
  
#include "Client.h"  
#include "AnimGraphNode_CopyParentBone.h"  
  
#define LOCTEXT_NAMESPACE "A3Nodes"  
UAnimGraphNode_CopyParentBone::UAnimGraphNode_CopyParentBone(const FObjectInitializer& ObjectInitializer)  
:Super(ObjectInitializer)  
{  
}  
  
FText UAnimGraphNode_CopyParentBone::GetTooltipText() const  
{  
    return LOCTEXT("AnimGraphNode_CopyParentBone_Tooltip", "Copy parent bone's transform to this component's root. Their names must be same");  
}  
  
FText UAnimGraphNode_CopyParentBone::GetNodeTitle(ENodeTitleType::Type TitleType) const  
{  
    return LOCTEXT("AnimGraphNode_CopyParentBone_Title", "Copy Parent Bone");  
}  
  
FText UAnimGraphNode_CopyParentBone::GetControllerDescription() const  
{  
    return LOCTEXT("CopyParentBone", "Copy Parent Bone");  
}  
  
#undef LOCTEXT_NAMESPACE

參考內(nèi)容

創(chuàng)建自定義動畫節(jié)點

https://www.unrealengine.com/zh-CN/blog/creating-custom-animation-nodes