# 前言
继承关系：BP_XXX_Base -> BP_Idol_Base -> TsIdolActor -> AVCharacter -> ACharacter 。
主要逻辑位于TsIdolActor中，文件路径为`Script/LiveDirector/Character/TsIdolActor.ts`

# AVCharacter
主要实现了`virtual void OnRep_AttachmentReplication() override;`，声明了若干BlueprintNativeEvent：
- bool CanSyncRelativeTransform();  
- void BeforeAttachToNewParent();  
- void AfterAttachToNewParent();
	
## OnRep_AttachmentReplication()
注释：
>// 动捕模式下，CanSync=false. 各端自行计算Actor Location, client无需使用Server计算结果  
  // 自由行走模式下, CanSync=true，client需要同步server的transform信息。

同步Attachment行为。在AActor::OnRep_AttachmentReplication()的基础上添加：
- 判断CanSync标记，以此来决定是否同步Transform
- 未Attach组件=>Attch组件前后添加BeforeAttachToNewParent()、AfterAttachToNewParent()
```c++
auto CanSync = CanSyncRelativeTransform(); //获取Sync标记，具体的逻辑位于TsIdolActor.ts中
if (attachmentReplication.AttachParent)
{
	if (RootComponent)
	{
		USceneComponent* AttachParentComponent = (attachmentReplication.AttachComponent ? attachmentReplication.AttachComponent : attachmentReplication.AttachParent->GetRootComponent());
		if (AttachParentComponent)
		{
			if(CanSync)//增加判断Sync判断，只有在自由行走模式下才会同步Transform。
			{
				RootComponent->SetRelativeLocation_Direct(attachmentReplication.LocationOffset);
				RootComponent->SetRelativeRotation_Direct(attachmentReplication.RotationOffset);
				RootComponent->SetRelativeScale3D_Direct(attachmentReplication.RelativeScale3D);
			}
			
			// If we're already attached to the correct Parent and Socket, then the update must be position only.
			// AttachToComponent would early out in this case.
			// Note, we ignore the special case for simulated bodies in AttachToComponent as AttachmentReplication shouldn't get updated
			// if the body is simulated (see AActor::GatherMovement).
			const bool bAlreadyAttached = (AttachParentComponent == RootComponent->GetAttachParent() && attachmentReplication.AttachSocket == RootComponent->GetAttachSocketName() && AttachParentComponent->GetAttachChildren().Contains(RootComponent));
			if (bAlreadyAttached)
			{
				// Note, this doesn't match AttachToComponent, but we're assuming it's safe to skip physics (see comment above).
				if(CanSync)
				{
					RootComponent->UpdateComponentToWorld(EUpdateTransformFlags::SkipPhysicsUpdate, ETeleportType::None);
				}
			}
			else
			{
				BeforeAttachToNewParent();//增加BlueprintNativeEvent
				RootComponent->AttachToComponent(AttachParentComponent, FAttachmentTransformRules::KeepRelativeTransform, attachmentReplication.AttachSocket);
				AfterAttachToNewParent();//增加BlueprintNativeEvent
			}
		}
	}
}
```

# TsIdolActor.ts
## VirtualOverrider
CanSyncRelativeTransform()
- 不需要同步Transform的情况
	- AI控制的ACao角色不需要同步。
	- 使用TsIdolMovementComponent并且勾选了ManulMovement的情况不需要同步。
	- 动画蓝图中使用了**AnimGraphNode_Fullbody**节点，并且bGetMotionData为true的情况不需要同步。

具体代码如下：
```typescript
CanSyncRelativeTransform(): boolean {
	if (Utils.HasTag(this.PropTags, new UE.GameplayTag("Idol.AIACao"))) {
		return false;
	}
	if(this.MovementComp && this.MovementComp.ManulMovement){
		return false
	}
	var animInstance = this.Mesh.GetAnimInstance() as UE.IdolAnimInstance
	let fullbodyNode = Reflect.get(animInstance, 'AnimGraphNode_Fullbody') as UE.AnimNode_FullBody
	return !(fullbodyNode && fullbodyNode.bGetMotionData)
}
```