Ue Animation System

quodsoler/unreal-engine-skills/skills/ue-animation-system

作者 quodsolerf3742d7b688690810df369802b90430324e380b9無授權條款收錄於 2026年10月9日更新於 2026年10月9日

Use when writing or debugging Unreal Engine animation C++: AnimInstance subclasses, thread-safe update, FAnimInstanceProxy, montage playback and delegates, anim notifies, animation curves, blend spaces, anim state machines, linked anim layers, root motion. Also use when the user mentions 'UAnimInstance', 'NativeUpdateAnimation', 'NativeThreadSafeUpdateAnimation', 'Montage_Play', 'OnMontageEnded', 'UAnimNotify', 'UAnimNotifyState', 'branching point', 'GetCurveValue', 'blend space', 'AnimGraph', 'LinkAnimClassLayers', 'motion matching', 'motion warping', 'root motion'. For movement and RootMotionSource, see ue-character-movement; for montage-driven abilities, see ue-gameplay-abilities.

僅含說明Software Development

AI 產生的概覽

用於撰寫與除錯虛幻引擎 5.8 動畫 C++ 的參考，涵蓋 AnimInstance、蒙太奇、通知、曲線與根運動。

功能: 此技能提供虛幻引擎 5.8 執行階段動畫系統的 C++ 指引與經核對的 API 簽章，包括 UAnimInstance 子類別、FAnimInstanceProxy 執行緒安全更新、蒙太奇播放與委派、動畫通知與通知狀態、動畫曲線、混合空間、動畫狀態機、連結動畫層以及根運動。它也列出 5.8 隨附的動畫外掛，例如 PoseSearch、MotionWarping、Chooser、IKRig、ControlRig、BlendStack、OptimusCore 與 UAF。兩份參考檔案分別提供內建通知目錄與完整的移動設定流程。產出為程式碼範例與 API 指引，而非可執行的成品。
適用情境: 在撰寫或除錯虛幻引擎動畫 C++ 時使用，或當請求提到 UAnimInstance、NativeUpdateAnimation、NativeThreadSafeUpdateAnimation、Montage_Play、OnMontageEnded、UAnimNotify、GetCurveValue、混合空間、AnimGraph、LinkAnimClassLayers、運動匹配、運動變形或根運動等型別與函式時使用。它面向針對 UE 5.8 的特定引擎版本工作。
執行需求: 沒有指令碼，僅包含說明與參考文件。所述工作面向虛幻引擎 5.8 的 C++ 專案，需要 Engine 與 AnimGraphRuntime 模組，使用外掛型別時還需對應的外掛模組。若存在 .agents/ue-project-context.md 專案脈絡檔案，則會選擇性讀取。

UE Animation System

Target engine: UE 5.8. APIs below are verified against the 5.8 headers; older forms are listed under "Deprecated — do not use".

Covers the runtime animation path in the Engine module — UAnimInstance, FAnimInstanceProxy, UAnimMontage, UAnimNotify/UAnimNotifyState, curves, blend spaces, anim state machines, linked anim layers and root motion — plus the animation plugins shipped in 5.8 (PoseSearch, MotionWarping, Chooser, IKRig, ControlRig, BlendStack, OptimusCore, UAF). Build.cs: Engine for everything under Runtime/Engine/Classes/Animation, AnimGraphRuntime for the helper anim nodes such as FAnimNode_LayeredBoneBlend; plugin module names are listed per row below.

Context

Read .agents/ue-project-context.md if it exists (module names, conventions, enabled plugins, GAS/networking setup). Do not stop if it is missing.

Identify the area from the request and the codebase. Ask only when two plausible readings would produce different code.

Request is about…	Go to
AnimInstance subclass, thread-safe update, proxy	AnimInstance and Proxy
Playing/stopping montages, section jumps, end callbacks	Montages
Notifies, notify states, branching points, notify timing	Anim Notifies
Curve values, morph targets, curve metadata	Animation Curves
Blend spaces, state machines, aim offsets, layered blends	Blend Spaces and State Machines
Linked anim layers, per-mode locomotion swapping	Linked Anim Graphs and Layers
Root motion extraction and modes	Root Motion
Motion matching, warping, IK Rig, Control Rig, deformers	5.8 Animation Plugins

AnimInstance and Proxy

UAnimInstance (Animation/AnimInstance.h) runs in two phases. Game thread: NativeUpdateAnimation — safe to read gameplay state. Worker thread: NativeThreadSafeUpdateAnimation and blend-tree evaluation. Cache gameplay reads on the game thread; read only those cached values on the worker thread.

Verbatim virtuals (AnimInstance.h:1436-1457 public, :1716-1719 protected):

cpp

virtual void NativeInitializeAnimation();virtual void NativeUpdateAnimation(float DeltaSeconds);virtual void NativeThreadSafeUpdateAnimation(float DeltaSeconds);virtual void NativePostEvaluateAnimation();virtual void NativeUninitializeAnimation();virtual void NativeBeginPlay();virtual FAnimInstanceProxy* CreateAnimInstanceProxy();               // protectedvirtual void DestroyAnimInstanceProxy(FAnimInstanceProxy* InProxy);  // protected

virtual void NativeInitializeAnimation();virtual void NativeUpdateAnimation(float DeltaSeconds);virtual void NativeThreadSafeUpdateAnimation(float DeltaSeconds);virtual void NativePostEvaluateAnimation();virtual void NativeUninitializeAnimation();virtual void NativeBeginPlay();virtual FAnimInstanceProxy* CreateAnimInstanceProxy();               // protectedvirtual void DestroyAnimInstanceProxy(FAnimInstanceProxy* InProxy);  // protected

FAnimInstanceProxy (Public/Animation/AnimInstanceProxy.h) is the worker-thread data container. Its override points are protected (:603-669):

cpp

virtual void Initialize(UAnimInstance* InAnimInstance);virtual void PreUpdate(UAnimInstance* InAnimInstance, float DeltaSeconds);virtual void Update(float DeltaSeconds) {}virtual bool Evaluate(FPoseContext& Output) { return false; }virtual void PostUpdate(UAnimInstance* InAnimInstance) const;virtual void Uninitialize(UAnimInstance* InAnimInstance);

virtual void Initialize(UAnimInstance* InAnimInstance);virtual void PreUpdate(UAnimInstance* InAnimInstance, float DeltaSeconds);virtual void Update(float DeltaSeconds) {}virtual bool Evaluate(FPoseContext& Output) { return false; }virtual void PostUpdate(UAnimInstance* InAnimInstance) const;virtual void Uninitialize(UAnimInstance* InAnimInstance);

Reach the proxy with the protected templates GetProxyOnGameThread<T>() (:1746) and GetProxyOnAnyThread<T>() (:1769).

cpp

// MyAnimInstance.h#pragma once
#include "CoreMinimal.h"#include "Animation/AnimInstance.h"#include "Animation/AnimInstanceProxy.h"#include "MyAnimInstance.generated.h"
class ACharacter;class UCharacterMovementComponent;
USTRUCT()struct FMyAnimInstanceProxy : public FAnimInstanceProxy{    GENERATED_BODY()
    FMyAnimInstanceProxy() = default;    explicit FMyAnimInstanceProxy(UAnimInstance* InAnimInstance)        : FAnimInstanceProxy(InAnimInstance) {}
    // Written on the game thread in PreUpdate, read on the worker thread in Update.    FVector Velocity = FVector::ZeroVector;    float Speed = 0.f;    bool bIsFalling = false;
protected:    virtual void PreUpdate(UAnimInstance* InAnimInstance, float DeltaSeconds) override;    virtual void Update(float DeltaSeconds) override;};
UCLASS()class MYGAME_API UMyAnimInstance : public UAnimInstance{    GENERATED_BODY()
public:    virtual void NativeInitializeAnimation() override;    virtual void NativeUpdateAnimation(float DeltaSeconds) override;    virtual void NativeThreadSafeUpdateAnimation(float DeltaSeconds) override;    virtual void NativeUninitializeAnimation() override;
protected:    virtual FAnimInstanceProxy* CreateAnimInstanceProxy() override;    virtual void DestroyAnimInstanceProxy(FAnimInstanceProxy* InProxy) override;
    UPROPERTY(Transient)    TObjectPtr<ACharacter> OwningCharacter;
    UPROPERTY(Transient)    TObjectPtr<UCharacterMovementComponent> MovementComp;
    UPROPERTY(Transient, BlueprintReadOnly, Category = "Locomotion")    float Speed = 0.f;
    UPROPERTY(Transient, BlueprintReadOnly, Category = "Locomotion")    float Direction = 0.f;
    UPROPERTY(Transient, BlueprintReadOnly, Category = "Locomotion")    bool bIsInAir = false;};

// MyAnimInstance.h#pragma once
#include "CoreMinimal.h"#include "Animation/AnimInstance.h"#include "Animation/AnimInstanceProxy.h"#include "MyAnimInstance.generated.h"
class ACharacter;class UCharacterMovementComponent;
USTRUCT()struct FMyAnimInstanceProxy : public FAnimInstanceProxy{    GENERATED_BODY()
    FMyAnimInstanceProxy() = default;    explicit FMyAnimInstanceProxy(UAnimInstance* InAnimInstance)        : FAnimInstanceProxy(InAnimInstance) {}
    // Written on the game thread in PreUpdate, read on the worker thread in Update.    FVector Velocity = FVector::ZeroVector;    float Speed = 0.f;    bool bIsFalling = false;
protected:    virtual void PreUpdate(UAnimInstance* InAnimInstance, float DeltaSeconds) override;    virtual void Update(float DeltaSeconds) override;};
UCLASS()class MYGAME_API UMyAnimInstance : public UAnimInstance{    GENERATED_BODY()
public:    virtual void NativeInitializeAnimation() override;    virtual void NativeUpdateAnimation(float DeltaSeconds) override;    virtual void NativeThreadSafeUpdateAnimation(float DeltaSeconds) override;    virtual void NativeUninitializeAnimation() override;
protected:    virtual FAnimInstanceProxy* CreateAnimInstanceProxy() override;    virtual void DestroyAnimInstanceProxy(FAnimInstanceProxy* InProxy) override;
    UPROPERTY(Transient)    TObjectPtr<ACharacter> OwningCharacter;
    UPROPERTY(Transient)    TObjectPtr<UCharacterMovementComponent> MovementComp;
    UPROPERTY(Transient, BlueprintReadOnly, Category = "Locomotion")    float Speed = 0.f;
    UPROPERTY(Transient, BlueprintReadOnly, Category = "Locomotion")    float Direction = 0.f;
    UPROPERTY(Transient, BlueprintReadOnly, Category = "Locomotion")    bool bIsInAir = false;};

cpp

// MyAnimInstance.cpp#include "MyAnimInstance.h"#include "GameFramework/Character.h"#include "GameFramework/CharacterMovementComponent.h"#include "Kismet/KismetMathLibrary.h"
void FMyAnimInstanceProxy::PreUpdate(UAnimInstance* InAnimInstance, float DeltaSeconds){    FAnimInstanceProxy::PreUpdate(InAnimInstance, DeltaSeconds);
    // Game thread: safe to touch the owning actor here.    if (const ACharacter* Character = Cast<ACharacter>(InAnimInstance->TryGetPawnOwner()))    {        const UCharacterMovementComponent* Movement = Character->GetCharacterMovement();        Velocity = Movement->Velocity;        bIsFalling = Movement->IsFalling();    }}
void FMyAnimInstanceProxy::Update(float DeltaSeconds){    FAnimInstanceProxy::Update(DeltaSeconds);    Speed = Velocity.Size2D(); // Worker thread: proxy members only.}
FAnimInstanceProxy* UMyAnimInstance::CreateAnimInstanceProxy(){    return new FMyAnimInstanceProxy(this);}
void UMyAnimInstance::DestroyAnimInstanceProxy(FAnimInstanceProxy* InProxy){    delete InProxy;}
void UMyAnimInstance::NativeInitializeAnimation(){    Super::NativeInitializeAnimation();
    OwningCharacter = Cast<ACharacter>(TryGetPawnOwner());    if (OwningCharacter)    {        MovementComp = OwningCharacter->GetCharacterMovement();    }}
void UMyAnimInstance::NativeUpdateAnimation(float DeltaSeconds){    Super::NativeUpdateAnimation(DeltaSeconds);
    if (!OwningCharacter || !MovementComp)    {        return;    }
    const FVector CurrentVelocity = MovementComp->Velocity;    Speed = CurrentVelocity.Size2D();    bIsInAir = MovementComp->IsFalling();
    if (Speed > 3.f)    {        Direction = UKismetMathLibrary::NormalizedDeltaRotator(            CurrentVelocity.ToOrientationRotator(),            OwningCharacter->GetActorRotation()).Yaw;    }}
void UMyAnimInstance::NativeThreadSafeUpdateAnimation(float DeltaSeconds){    Super::NativeThreadSafeUpdateAnimation(DeltaSeconds);
    // Worker thread: read the proxy, never the owning actor. This runs before the    // proxy's Update(), so read what PreUpdate wrote, not what Update derives.    const FMyAnimInstanceProxy& Proxy = GetProxyOnAnyThread<FMyAnimInstanceProxy>();    Speed = Proxy.Velocity.Size2D();    bIsInAir = Proxy.bIsFalling;}
void UMyAnimInstance::NativeUninitializeAnimation(){    Super::NativeUninitializeAnimation();    OwningCharacter = nullptr;    MovementComp = nullptr;}

// MyAnimInstance.cpp#include "MyAnimInstance.h"#include "GameFramework/Character.h"#include "GameFramework/CharacterMovementComponent.h"#include "Kismet/KismetMathLibrary.h"
void FMyAnimInstanceProxy::PreUpdate(UAnimInstance* InAnimInstance, float DeltaSeconds){    FAnimInstanceProxy::PreUpdate(InAnimInstance, DeltaSeconds);
    // Game thread: safe to touch the owning actor here.    if (const ACharacter* Character = Cast<ACharacter>(InAnimInstance->TryGetPawnOwner()))    {        const UCharacterMovementComponent* Movement = Character->GetCharacterMovement();        Velocity = Movement->Velocity;        bIsFalling = Movement->IsFalling();    }}
void FMyAnimInstanceProxy::Update(float DeltaSeconds){    FAnimInstanceProxy::Update(DeltaSeconds);    Speed = Velocity.Size2D(); // Worker thread: proxy members only.}
FAnimInstanceProxy* UMyAnimInstance::CreateAnimInstanceProxy(){    return new FMyAnimInstanceProxy(this);}
void UMyAnimInstance::DestroyAnimInstanceProxy(FAnimInstanceProxy* InProxy){    delete InProxy;}
void UMyAnimInstance::NativeInitializeAnimation(){    Super::NativeInitializeAnimation();
    OwningCharacter = Cast<ACharacter>(TryGetPawnOwner());    if (OwningCharacter)    {        MovementComp = OwningCharacter->GetCharacterMovement();    }}
void UMyAnimInstance::NativeUpdateAnimation(float DeltaSeconds){    Super::NativeUpdateAnimation(DeltaSeconds);
    if (!OwningCharacter || !MovementComp)    {        return;    }
    const FVector CurrentVelocity = MovementComp->Velocity;    Speed = CurrentVelocity.Size2D();    bIsInAir = MovementComp->IsFalling();
    if (Speed > 3.f)    {        Direction = UKismetMathLibrary::NormalizedDeltaRotator(            CurrentVelocity.ToOrientationRotator(),            OwningCharacter->GetActorRotation()).Yaw;    }}
void UMyAnimInstance::NativeThreadSafeUpdateAnimation(float DeltaSeconds){    Super::NativeThreadSafeUpdateAnimation(DeltaSeconds);
    // Worker thread: read the proxy, never the owning actor. This runs before the    // proxy's Update(), so read what PreUpdate wrote, not what Update derives.    const FMyAnimInstanceProxy& Proxy = GetProxyOnAnyThread<FMyAnimInstanceProxy>();    Speed = Proxy.Velocity.Size2D();    bIsInAir = Proxy.bIsFalling;}
void UMyAnimInstance::NativeUninitializeAnimation(){    Super::NativeUninitializeAnimation();    OwningCharacter = nullptr;    MovementComp = nullptr;}

Query pending-update state with NeedsUpdate() (AnimInstance.h:512); the bNeedsUpdate member is deprecated.

Montages

Source: Animation/AnimInstance.h, Animation/AnimMontage.h. Verbatim signatures (AnimInstance.h:626-796):

cpp

float Montage_Play(UAnimMontage* MontageToPlay, float InPlayRate = 1.f,    EMontagePlayReturnType ReturnValueType = EMontagePlayReturnType::MontageLength,    float InTimeToStartMontageAt = 0.f, bool bStopAllMontages = true);// Same trailing params; override the asset's blend-in (FMontageBlendSettings adds BlendProfile and// BlendMode, e.g. EMontageBlendMode::Inertialization)float Montage_PlayWithBlendIn(UAnimMontage* MontageToPlay, const FAlphaBlendArgs& BlendIn, ...);float Montage_PlayWithBlendSettings(UAnimMontage* MontageToPlay, const FMontageBlendSettings& BlendInSettings, ...);void  Montage_Stop(float InBlendOutTime, const UAnimMontage* Montage = NULL);void  Montage_Pause(const UAnimMontage* Montage = NULL);void  Montage_Resume(const UAnimMontage* Montage);void  Montage_JumpToSection(FName SectionName, const UAnimMontage* Montage = NULL);void  Montage_SetNextSection(FName SectionNameToChange, FName NextSection,          const UAnimMontage* Montage = NULL);void  Montage_SetPlayRate(const UAnimMontage* Montage, float NewPlayRate = 1.f);bool  Montage_IsPlaying(const UAnimMontage* Montage) const;bool  Montage_IsActive(const UAnimMontage* Montage) const;bool  Montage_GetIsStopped(const UAnimMontage* Montage) const;float Montage_GetPosition(const UAnimMontage* Montage) const;void  Montage_SetPosition(const UAnimMontage* Montage, float NewPosition);float Montage_GetBlendTime(const UAnimMontage* Montage) const;float Montage_GetPlayRate(const UAnimMontage* Montage) const;FName Montage_GetCurrentSection(const UAnimMontage* Montage = NULL) const;void  Montage_SetEndDelegate(FOnMontageEnded& InOnMontageEnded, UAnimMontage* Montage = NULL);void  Montage_SetBlendingOutDelegate(FOnMontageBlendingOutStarted& InOnMontageBlendingOut,          UAnimMontage* Montage = NULL);

float Montage_Play(UAnimMontage* MontageToPlay, float InPlayRate = 1.f,    EMontagePlayReturnType ReturnValueType = EMontagePlayReturnType::MontageLength,    float InTimeToStartMontageAt = 0.f, bool bStopAllMontages = true);// Same trailing params; override the asset's blend-in (FMontageBlendSettings adds BlendProfile and// BlendMode, e.g. EMontageBlendMode::Inertialization)float Montage_PlayWithBlendIn(UAnimMontage* MontageToPlay, const FAlphaBlendArgs& BlendIn, ...);float Montage_PlayWithBlendSettings(UAnimMontage* MontageToPlay, const FMontageBlendSettings& BlendInSettings, ...);void  Montage_Stop(float InBlendOutTime, const UAnimMontage* Montage = NULL);void  Montage_Pause(const UAnimMontage* Montage = NULL);void  Montage_Resume(const UAnimMontage* Montage);void  Montage_JumpToSection(FName SectionName, const UAnimMontage* Montage = NULL);void  Montage_SetNextSection(FName SectionNameToChange, FName NextSection,          const UAnimMontage* Montage = NULL);void  Montage_SetPlayRate(const UAnimMontage* Montage, float NewPlayRate = 1.f);bool  Montage_IsPlaying(const UAnimMontage* Montage) const;bool  Montage_IsActive(const UAnimMontage* Montage) const;bool  Montage_GetIsStopped(const UAnimMontage* Montage) const;float Montage_GetPosition(const UAnimMontage* Montage) const;void  Montage_SetPosition(const UAnimMontage* Montage, float NewPosition);float Montage_GetBlendTime(const UAnimMontage* Montage) const;float Montage_GetPlayRate(const UAnimMontage* Montage) const;FName Montage_GetCurrentSection(const UAnimMontage* Montage = NULL) const;void  Montage_SetEndDelegate(FOnMontageEnded& InOnMontageEnded, UAnimMontage* Montage = NULL);void  Montage_SetBlendingOutDelegate(FOnMontageBlendingOutStarted& InOnMontageBlendingOut,          UAnimMontage* Montage = NULL);

EMontagePlayReturnType (AnimInstance.h:70) is MontageLength or Duration. Once blend-out starts, Montage_IsPlaying and Montage_IsActive return false and Montage_GetIsStopped returns true, even though the pose is still blending (Stop() removes the instance from ActiveMontagesMap, AnimInstance.cpp:3709). Use OnMontageBlendingOut / Montage_SetBlendingOutDelegate for blend-out start and OnMontageEnded for the end. Delegate types (AnimInstance.h:79-80) are single-cast:

cpp

DECLARE_DELEGATE_TwoParams(FOnMontageEnded, UAnimMontage*, bool /*bInterrupted*/)DECLARE_DELEGATE_TwoParams(FOnMontageBlendingOutStarted, UAnimMontage*, bool /*bInterrupted*/)

DECLARE_DELEGATE_TwoParams(FOnMontageEnded, UAnimMontage*, bool /*bInterrupted*/)DECLARE_DELEGATE_TwoParams(FOnMontageBlendingOutStarted, UAnimMontage*, bool /*bInterrupted*/)

For broadcast, use the dynamic multicast members OnMontageStarted, OnMontageEnded and OnMontageBlendingOut (:758-770).

cpp

void UMyWeaponComponent::PlayAttackMontage(USkeletalMeshComponent* Mesh, UAnimMontage* Montage){    UAnimInstance* AnimInst = Mesh ? Mesh->GetAnimInstance() : nullptr;    if (!AnimInst || !Montage)    {        return;    }
    // Play FIRST: the delegate setters resolve the active montage instance,    // which does not exist until Montage_Play has created it.    if (AnimInst->Montage_Play(Montage) <= 0.f)    {        return;    }
    FOnMontageEnded EndDelegate;    EndDelegate.BindUObject(this, &UMyWeaponComponent::OnAttackEnded);    AnimInst->Montage_SetEndDelegate(EndDelegate, Montage);
    FOnMontageBlendingOutStarted BlendOutDelegate;    BlendOutDelegate.BindUObject(this, &UMyWeaponComponent::OnAttackBlendingOut);    AnimInst->Montage_SetBlendingOutDelegate(BlendOutDelegate, Montage);}
void UMyWeaponComponent::OnAttackEnded(UAnimMontage* Montage, bool bInterrupted) {}void UMyWeaponComponent::OnAttackBlendingOut(UAnimMontage* Montage, bool bInterrupted) {}

void UMyWeaponComponent::PlayAttackMontage(USkeletalMeshComponent* Mesh, UAnimMontage* Montage){    UAnimInstance* AnimInst = Mesh ? Mesh->GetAnimInstance() : nullptr;    if (!AnimInst || !Montage)    {        return;    }
    // Play FIRST: the delegate setters resolve the active montage instance,    // which does not exist until Montage_Play has created it.    if (AnimInst->Montage_Play(Montage) <= 0.f)    {        return;    }
    FOnMontageEnded EndDelegate;    EndDelegate.BindUObject(this, &UMyWeaponComponent::OnAttackEnded);    AnimInst->Montage_SetEndDelegate(EndDelegate, Montage);
    FOnMontageBlendingOutStarted BlendOutDelegate;    BlendOutDelegate.BindUObject(this, &UMyWeaponComponent::OnAttackBlendingOut);    AnimInst->Montage_SetBlendingOutDelegate(BlendOutDelegate, Montage);}
void UMyWeaponComponent::OnAttackEnded(UAnimMontage* Montage, bool bInterrupted) {}void UMyWeaponComponent::OnAttackBlendingOut(UAnimMontage* Montage, bool bInterrupted) {}

USkeletalMeshComponent (Components/SkeletalMeshComponent.h):

cpp

UAnimInstance* GetAnimInstance() const;                                  // :1111void PlayAnimation(class UAnimationAsset* NewAnimToPlay, bool bLooping); // :1258virtual void SetAnimInstanceClass(class UClass* NewClass);               // :1096void LinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);            // :1194void UnlinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);          // :1205UAnimInstance* GetLinkedAnimGraphInstanceByTag(FName InTag) const;       // :1160void SetAnimationMode(EAnimationMode::Type InAnimationMode,    bool bForceInitAnimScriptInstance = true);                           // :1246

UAnimInstance* GetAnimInstance() const;                                  // :1111void PlayAnimation(class UAnimationAsset* NewAnimToPlay, bool bLooping); // :1258virtual void SetAnimInstanceClass(class UClass* NewClass);               // :1096void LinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);            // :1194void UnlinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);          // :1205UAnimInstance* GetLinkedAnimGraphInstanceByTag(FName InTag) const;       // :1160void SetAnimationMode(EAnimationMode::Type InAnimationMode,    bool bForceInitAnimScriptInstance = true);                           // :1246

PlayAnimation puts the component in single-node mode; SetAnimInstanceClass puts it in Animation Blueprint mode. Mixing both on one component silently drops one of them.

Multiplayer: with GAS, drive montages through UAbilityTask_PlayMontageAndWait::CreatePlayMontageAndWaitProxy (GameplayAbilities/Public/Abilities/Tasks/AbilityTask_PlayMontageAndWait.h:66) — see ue-gameplay-abilities. Without GAS, replicate the montage choice yourself and call Montage_Play from the replication callback; never call it independently per net role.

Anim Notifies

Source: Animation/AnimNotifies/AnimNotify.h, AnimNotifyState.h. Override these exact signatures:

cpp

// UAnimNotify (AnimNotify.h:85-86, :59)virtual void Notify(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    const FAnimNotifyEventReference& EventReference);virtual void BranchingPointNotify(FBranchingPointNotifyPayload& BranchingPointPayload);FString GetNotifyName() const;  // BlueprintNativeEvent: override GetNotifyName_Implementation
// UAnimNotifyState (AnimNotifyState.h:74-80)virtual void NotifyBegin(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    float TotalDuration, const FAnimNotifyEventReference& EventReference);virtual void NotifyTick(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    float FrameDeltaTime, const FAnimNotifyEventReference& EventReference);virtual void NotifyEnd(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    const FAnimNotifyEventReference& EventReference);

// UAnimNotify (AnimNotify.h:85-86, :59)virtual void Notify(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    const FAnimNotifyEventReference& EventReference);virtual void BranchingPointNotify(FBranchingPointNotifyPayload& BranchingPointPayload);FString GetNotifyName() const;  // BlueprintNativeEvent: override GetNotifyName_Implementation
// UAnimNotifyState (AnimNotifyState.h:74-80)virtual void NotifyBegin(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    float TotalDuration, const FAnimNotifyEventReference& EventReference);virtual void NotifyTick(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    float FrameDeltaTime, const FAnimNotifyEventReference& EventReference);virtual void NotifyEnd(USkeletalMeshComponent* MeshComp, UAnimSequenceBase* Animation,    const FAnimNotifyEventReference& EventReference);

Received_Notify (AnimNotify.h:62) and Received_NotifyBegin/Received_NotifyTick/Received_NotifyEnd (AnimNotifyState.h:45-51) are BlueprintImplementableEvent entry points — implement them in Blueprint, never override them in C++.

Montage notify timing is per event: FAnimNotifyEvent::MontageTickType (Public/Animation/AnimTypes.h:318) is EMontageNotifyTickType::Queued (fired at the end of the evaluation phase — the header states it is not suitable for changing sections or montage position) or BranchingPoint (fired as encountered, suitable for section changes). A native notify forces the branching-point path by setting bIsNativeBranchingPoint = true in its constructor (AnimNotify.h:123, AnimNotifyState.h:108).

Bind named montage notifies from outside the AnimInstance with OnPlayMontageNotifyBegin / OnPlayMontageNotifyEnd (AnimInstance.h:1820-1823, type FPlayMontageAnimNotifyDelegate).

See references/anim-notify-reference.md [blocked] for the built-in notify catalog, complete custom notify and notify-state examples, FAnimNotifyEvent fields and linked-instance propagation.

Animation Curves

Curves are addressed by FName in 5.8 — no smart names, no curve UIDs, no mapping lookups.

cpp

// UAnimInstance (AnimInstance.h:1241-1273)float GetCurveValue(FName CurveName) const;bool  GetCurveValue(FName CurveName, float& OutValue) const;bool  GetCurveValueWithDefault(FName CurveName, float DefaultValue, float& OutValue) const;void  SetMorphTarget(FName MorphTargetName, float Value);
// USkeletalMeshComponent (SkeletalMeshComponent.h:664-667)bool GetCurveValue(FName CurveName, float DefaultValue, float& Value) const;const FBlendedHeapCurve& GetAnimCurves() const;

// UAnimInstance (AnimInstance.h:1241-1273)float GetCurveValue(FName CurveName) const;bool  GetCurveValue(FName CurveName, float& OutValue) const;bool  GetCurveValueWithDefault(FName CurveName, float DefaultValue, float& OutValue) const;void  SetMorphTarget(FName MorphTargetName, float Value);
// USkeletalMeshComponent (SkeletalMeshComponent.h:664-667)bool GetCurveValue(FName CurveName, float DefaultValue, float& Value) const;const FBlendedHeapCurve& GetAnimCurves() const;

Per-curve flags (does the curve drive a material or a morph target) live in CurveMetaData on the skeleton (Animation/Skeleton.h:387-467): GetCurveMetaData(FName), AddCurveMetaData(FName CurveName, bool bTransact = true), GetCurveMetaDataNames(TArray<FName>& OutNames), SetCurveMetaDataMorphTarget(FName CurveName, bool bOverrideMorphTarget).

Blend Spaces and State Machines

Blend spaces are assets sampled by AnimGraph nodes; drive them from UPROPERTY members the AnimGraph reads.

Asset class	Header	Use
`UBlendSpace`	`Animation/BlendSpace.h:470`	Two-axis blend, typically Direction x Speed
`UBlendSpace1D`	`Animation/BlendSpace1D.h:19`	Single axis, typically Speed
`UAimOffsetBlendSpace`	`Animation/AimOffsetBlendSpace.h:20`	Additive aim poses over a base pose

Axis smoothing is FInterpolationParameter (BlendSpace.h:80-110): InterpolationTime, DampingRatio, MaxSpeed, and InterpolationType of type TEnumAsByte<EFilterInterpolationType> — values BSIT_Average, BSIT_Linear, BSIT_Cubic, BSIT_EaseInOut, BSIT_ExponentialDecay, BSIT_SpringDamper (Engine/EngineTypes.h:1356).

Bind native C++ to a compiled state machine from NativeInitializeAnimation (AnimInstance.h:1461-1473):

cpp

// CanStartMoving() and OnLandEntered() are members of UMyAnimInstance.// DECLARE_DELEGATE_RetVal(bool, FCanTakeTransition)                     AnimInstance.h:118// DECLARE_DELEGATE_ThreeParams(FOnGraphStateChanged,//     const struct FAnimNode_StateMachine&, int32, int32)              AnimInstance.h:121AddNativeTransitionBinding(FName("LocomotionSM"), FName("Idle"), FName("Walk"),    FCanTakeTransition::CreateUObject(this, &UMyAnimInstance::CanStartMoving),    FName("IdleToMoving"));
AddNativeStateEntryBinding(FName("LocomotionSM"), FName("Land"),    FOnGraphStateChanged::CreateUObject(this, &UMyAnimInstance::OnLandEntered));

// CanStartMoving() and OnLandEntered() are members of UMyAnimInstance.// DECLARE_DELEGATE_RetVal(bool, FCanTakeTransition)                     AnimInstance.h:118// DECLARE_DELEGATE_ThreeParams(FOnGraphStateChanged,//     const struct FAnimNode_StateMachine&, int32, int32)              AnimInstance.h:121AddNativeTransitionBinding(FName("LocomotionSM"), FName("Idle"), FName("Walk"),    FCanTakeTransition::CreateUObject(this, &UMyAnimInstance::CanStartMoving),    FName("IdleToMoving"));
AddNativeStateEntryBinding(FName("LocomotionSM"), FName("Land"),    FOnGraphStateChanged::CreateUObject(this, &UMyAnimInstance::OnLandEntered));

Query at runtime with GetStateMachineIndex(FName MachineName) (:1202), GetStateMachineInstanceFromName(FName MachineName) (:1191) and GetInstanceStateWeight(int32 MachineIndex, int32 StateIndex) (:1116).

See references/locomotion-setup.md [blocked] for a full blend space, state machine, layered-blend-per-bone and aim-offset setup.

Linked Anim Graphs and Layers

Source: Animation/AnimNode_LinkedAnimGraph.h, Animation/AnimNode_LinkedAnimLayer.h.

cpp

// UAnimInstance (AnimInstance.h:850-910)virtual void LinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);virtual void UnlinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);UAnimInstance* GetLinkedAnimLayerInstanceByClass(TSubclassOf<UAnimInstance> InClass,    bool bCheckForChildClass = false) const;void LinkAnimGraphByTag(FName InTag, TSubclassOf<UAnimInstance> InClass);UAnimInstance* GetLinkedAnimGraphInstanceByTag(FName InTag) const;

// UAnimInstance (AnimInstance.h:850-910)virtual void LinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);virtual void UnlinkAnimClassLayers(TSubclassOf<UAnimInstance> InClass);UAnimInstance* GetLinkedAnimLayerInstanceByClass(TSubclassOf<UAnimInstance> InClass,    bool bCheckForChildClass = false) const;void LinkAnimGraphByTag(FName InTag, TSubclassOf<UAnimInstance> InClass);UAnimInstance* GetLinkedAnimGraphInstanceByTag(FName InTag) const;

LinkAnimClassLayers(nullptr) restores the default layer implementations. Notify flow across linked instances is set by SetReceiveNotifiesFromLinkedInstances(bool bSet) and SetPropagateNotifiesToLinkedInstances(bool bSet) (:523-531), or per node by bReceiveNotifiesFromLinkedInstances / bPropagateNotifiesToLinkedInstances (AnimNode_LinkedAnimGraph.h:76-80). SetUseMainInstanceMontageEvaluationData(bool bSet) (:537) makes linked layers share the main instance's montage evaluation.

Blend the swap with PendingBlendInDuration / PendingBlendOutDuration on the linked node (AnimNode_LinkedAnimGraph.h:60-67), or request one from code:

Root Motion

ERootMotionMode::Type (Animation/AnimEnums.h:27-42): NoRootMotionExtraction, IgnoreRootMotion, RootMotionFromEverything, RootMotionFromMontagesOnly. The header marks RootMotionFromEverything as unsuitable for networked multiplayer and RootMotionFromMontagesOnly as the networked choice.

cpp

// AnimInstance.h:372, :1066, :1662TEnumAsByte<ERootMotionMode::Type> RootMotionMode;   // UPROPERTY(EditDefaultsOnly)void SetRootMotionMode(TEnumAsByte<ERootMotionMode::Type> Value);FRootMotionMovementParams ConsumeExtractedRootMotion(float Alpha);
// Suppress root motion for part of a montage (AnimMontage.h:562-564)if (FAnimMontageInstance* Inst = AnimInst->GetActiveInstanceForMontage(Montage)){    Inst->PushDisableRootMotion();    // ... later ...    Inst->PopDisableRootMotion();}

// AnimInstance.h:372, :1066, :1662TEnumAsByte<ERootMotionMode::Type> RootMotionMode;   // UPROPERTY(EditDefaultsOnly)void SetRootMotionMode(TEnumAsByte<ERootMotionMode::Type> Value);FRootMotionMovementParams ConsumeExtractedRootMotion(float Alpha);
// Suppress root motion for part of a montage (AnimMontage.h:562-564)if (FAnimMontageInstance* Inst = AnimInst->GetActiveInstanceForMontage(Montage)){    Inst->PushDisableRootMotion();    // ... later ...    Inst->PopDisableRootMotion();}

Montage root motion and RootMotionSource are separate systems: the montage path feeds the pose-derived delta into the movement component, while RootMotionSource applies scripted movement with no animation attached. Networked prediction, correction and bAllowPhysicsRotationDuringAnimRootMotion (GameFramework/CharacterMovementComponent.h:1083) belong to ue-character-movement.

5.8 Animation Plugins

Each is disabled by default in the .uproject unless noted; add the module to Build.cs when you use its types.

Plugin / module	5.8 maturity	Key types and headers
`PoseSearch`	production	`FAnimNode_MotionMatching` (`PoseSearch/AnimNode_MotionMatching.h:18`), `UPoseSearchDatabase` (`PoseSearch/PoseSearchDatabase.h:502`); trajectories are `FTransformTrajectorySample` (`Runtime/Engine/Public/Animation/TrajectoryTypes.h:18`)
`Chooser`	production	`UChooserTable` (`Chooser.h:22`), `UChooserFunctionLibrary` (`ChooserFunctionLibrary.h:18`) — data-driven asset selection, commonly feeding motion matching
`MotionWarping`	Beta in 5.8	`UMotionWarpingComponent` (`MotionWarpingComponent.h:100`), `URootMotionModifier` (`RootMotionModifier.h:71`); rotation offsets use `AdditionalRotationOffset` (`RootMotionModifier.h:407`)
`IKRig`	production, enabled by default	`UIKRigDefinition` (`Rig/IKRigDefinition.h:206`), `UIKRetargeter` (`Retargeter/IKRetargeter.h:70`) — runtime IK solving and animation retargeting
`ControlRig`	production, enabled by default	`UControlRig` (`ControlRig.h:63`), `FAnimNode_ControlRig` (`AnimNode_ControlRig.h:21`) — procedural rigs evaluated inside the AnimGraph
`BlendStack`	production	`FAnimNode_BlendStack` and `FAnimNode_BlendStack_Standalone` (`BlendStack/AnimNode_BlendStack.h:272,150`) — the blend stack motion matching is built on
`OptimusCore` (Deformer Graph)	Beta in 5.8	`UOptimusDeformer` (`OptimusDeformer.h:132`) — GPU mesh deformation graphs
`UAF`	Experimental in 5.8	`Plugins/Experimental/UAF/UAF`, module `UAF`: `UUAFRigVMAsset` (`AnimNextRigVMAsset.h:61`), `UUAFComponent` (`Component/AnimNextComponent.h:77`) — the successor animation framework

Deprecated — do not use

Do not emit	Use in 5.8	Source
`FSmartName`, `FSmartNameMapping`, `FSmartNameContainer`	plain `FName` curve names	`UE_DEPRECATED(5.8)` in `Animation/SmartName.h:20,80,121`
Skeleton smart-name curve tables	`CurveMetaData` accessors on `USkeleton`	`UE_DEPRECATED(5.7)` in `Animation/Skeleton.h:505`
`AnimCurveUID`	`FName` curve names	`UE_DEPRECATED(5.7)` in `Animation/Skeleton.h:384`
`UAnimInstance::bNeedsUpdate`	`NeedsUpdate()`	`UE_DEPRECATED(5.7)` in `Animation/AnimInstance.h:389`
`USkeletalMeshComponent::SetAnimClass`	`SetAnimInstanceClass`	`UE_DEPRECATED(5.5)` in `Components/SkeletalMeshComponent.h:1084`
`USkeletalMeshComponent::AnimCurves` member	`GetAnimCurves()` / `GetCurveValue()`	`UE_DEPRECATED(5.6)` in `Components/SkeletalMeshComponent.h:470`
`UAnimSequence::RetargetSourceAsset` member	`GetRetargetSourceAsset` / `SetRetargetSourceAsset`	`UE_DEPRECATED(5.5)` in `Animation/AnimSequence.h:305`
`FTrajectorySample`	`FTransformTrajectorySample`	`UE_DEPRECATED(5.6)` in `Public/Animation/MotionTrajectoryTypes.h:10`
`FPoseSearchQueryTrajectorySample`	`FTransformTrajectorySample`	`UE_DEPRECATED(5.6)` in `PoseSearch/PoseSearchTrajectoryTypes.h:16`
`FPoseSearchDatabaseSequence`, `FPoseSearchDatabaseBlendSpace`	`FPoseSearchDatabaseAnimationAsset`	`UE_DEPRECATED(5.7)` in `PoseSearch/PoseSearchDatabase.h:228`
`EMotionWarpRotationType::OppositeDefault` / `OppositeFacing`	`AdditionalRotationOffset`	`UE_DEPRECATED(5.8)` in `MotionWarping/RootMotionModifier.h:309,312`
`FAnimInstanceProxy::GetSlotInertializationRequest`	`GetSlotInertializationRequestData`	`UE_DEPRECATED(5.5)` in `Public/Animation/AnimInstanceProxy.h:444`
`SetSubInstanceClassByTag`, `GetSubInstanceByTag`	`LinkAnimGraphByTag`, `GetLinkedAnimGraphInstanceByTag`	`UE_DEPRECATED(4.24)` in `Animation/AnimInstance.h:860,845`
`SetLayerOverlay`, `ClearLayerOverlay`	`LinkAnimClassLayers`, `UnlinkAnimClassLayers`	`UE_DEPRECATED(4.24)` in `Animation/AnimInstance.h:868,880`
`GetLayerSubInstanceByClass`	`GetLinkedAnimLayerInstanceByClass`	`UE_DEPRECATED(4.24)` in `Animation/AnimInstance.h:906`

Common Mistakes

Touching the owning actor in NativeThreadSafeUpdateAnimation: that function runs on a worker thread, so TryGetPawnOwner(), component queries and traces are unsafe there. Cache what you need in NativeUpdateAnimation or in FAnimInstanceProxy::PreUpdate, and read only those members on the worker thread.

Binding montage delegates before Montage_Play: Montage_SetEndDelegate and Montage_SetBlendingOutDelegate resolve the active montage instance, which does not exist yet. Call Montage_Play first, check the return value is greater than zero, then bind.

Overriding Received_Notify in C++: it is a BlueprintImplementableEvent. Override Notify(USkeletalMeshComponent*, UAnimSequenceBase*, const FAnimNotifyEventReference&) instead.

Jumping sections from a queued notify: queued notifies fire after the evaluation phase, so Montage_JumpToSection from one lands a frame late. Set bIsNativeBranchingPoint = true and override BranchingPointNotify for section control.

Looking curves up by smart name or UID: FSmartName, FSmartNameMapping and AnimCurveUID are deprecated. Pass FName to GetCurveValue and keep per-curve flags in CurveMetaData.

Declaring a proxy override public: Initialize, PreUpdate, Update, Evaluate and PostUpdate are protected on FAnimInstanceProxy, and so are CreateAnimInstanceProxy / DestroyAnimInstanceProxy on UAnimInstance. Keep the access level or the override will not compile.

Skipping the base call: every Native* override calls its Super:: form, and every proxy override calls FAnimInstanceProxy::<Name>; the base implementations drive montage ticking, notify queues and proxy bookkeeping.

Related Skills

ue-character-movement — UCharacterMovementComponent, RootMotionSource, networked root motion prediction and correction.
ue-gameplay-abilities — UAbilityTask_PlayMontageAndWait, GAS montage replication, ability-driven animation.
ue-actor-component-architecture — USkeletalMeshComponent setup, attachment, component tick ordering.
ue-sequencer-cinematics — Level Sequence animation tracks and cinematic playback on skeletal meshes.
ue-mass-entity — crowd-scale animation through Mass representation instead of per-actor AnimInstances.
ue-cpp-foundations — delegate binding, UPROPERTY/UFUNCTION specifiers, TObjectPtr.
ue-niagara-effects — Niagara systems spawned from notifies and skeletal mesh data interfaces.
ue-audio-system — UAudioComponent, MetaSounds, submixes, attenuation and concurrency
ue-mover — the Mover plugin: movement modes, layered moves and rollback networking

來源與署名

來源：quodsoler/unreal-engine-skills位於skills/ue-animation-system提交f3742d7

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Ue Animation System

UE Animation System

Context

AnimInstance and Proxy

Montages

Anim Notifies

Animation Curves

Blend Spaces and State Machines

Linked Anim Graphs and Layers

Root Motion

5.8 Animation Plugins

Deprecated — do not use

Common Mistakes

Related Skills

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