Unity 刪除Animator中無效的Animation引用

問題現象：

導出Animator時，發現Animator中關聯了不少沒用的Animation文件。
這些無效的Animation都是之前曾經使用過的動畫文件。

分析問題

猜想Animator中可能殘留了舊的動畫引用信息，致使該問題。
因爲作的一批角色動畫，動做都是配套的，Animator可重用。
因此除了第一個角色的動畫控制器是製做的，以後的Animator都是複製的第一個，換了動畫片斷，而關聯的無效動畫偏偏就是第一個角色的動畫，那麼基本能夠肯定，Animator在在替換動畫後，依然殘留了之前的動畫片斷引用，沒有被替換掉。

百度具體的解決方法 暫時沒有百度到 本身造個輪子吧。

先對比一下文件 看看殘留的信息在哪
1.新建一個空白的動畫控制器
新建 Empty.controller 並添加一個空節點New State：

%YAML 1.1
%TAG !u! tag:unity3d.com,2011:
--- !u!91 &9100000
AnimatorController:
  m_ObjectHideFlags: 0
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInternal: {fileID: 0}
  m_Name: Empty
  serializedVersion: 5
  m_AnimatorParameters: []
  m_AnimatorLayers:
  - serializedVersion: 5
    m_Name: Base Layer
    m_StateMachine: {fileID: 1107732010857133768}
    m_Mask: {fileID: 0}
    m_Motions: []
    m_Behaviours: []
    m_BlendingMode: 0
    m_SyncedLayerIndex: -1
    m_DefaultWeight: 0
    m_IKPass: 0
    m_SyncedLayerAffectsTiming: 0
    m_Controller: {fileID: 9100000}
--- !u!1102 &1102462526423969762
AnimatorState:
  serializedVersion: 5
  m_ObjectHideFlags: 1
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInternal: {fileID: 0}
  m_Name: New State
  m_Speed: 1
  m_CycleOffset: 0
  m_Transitions: []
  m_StateMachineBehaviours: []
  m_Position: {x: 50, y: 50, z: 0}
  m_IKOnFeet: 0
  m_WriteDefaultValues: 1
  m_Mirror: 0
  m_SpeedParameterActive: 0
  m_MirrorParameterActive: 0
  m_CycleOffsetParameterActive: 0
  m_TimeParameterActive: 0
  m_Motion: {fileID: 0}
  m_Tag: 
  m_SpeedParameter: 
  m_MirrorParameter: 
  m_CycleOffsetParameter: 
  m_TimeParameter: 
--- !u!1107 &1107732010857133768
AnimatorStateMachine:
  serializedVersion: 5
  m_ObjectHideFlags: 1
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInternal: {fileID: 0}
  m_Name: Base Layer
  m_ChildStates:
  - serializedVersion: 1
    m_State: {fileID: 1102462526423969762}
    m_Position: {x: 270.93024, y: 126.44006, z: 0}
  m_ChildStateMachines: []
  m_AnyStateTransitions: []
  m_EntryTransitions: []
  m_StateMachineTransitions: {}
  m_StateMachineBehaviours: []
  m_AnyStatePosition: {x: 50, y: 20, z: 0}
  m_EntryPosition: {x: 50, y: 120, z: 0}
  m_ExitPosition: {x: 800, y: 120, z: 0}
  m_ParentStateMachinePosition: {x: 800, y: 20, z: 0}
  m_DefaultState: {fileID: 1102462526423969762}

2.賦值動畫片斷：

%YAML 1.1
%TAG !u! tag:unity3d.com,2011:
--- !u!91 &9100000
AnimatorController:
  m_ObjectHideFlags: 0
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInternal: {fileID: 0}
  m_Name: Empty
  serializedVersion: 5
  m_AnimatorParameters: []
  m_AnimatorLayers:
  - serializedVersion: 5
    m_Name: Base Layer
    m_StateMachine: {fileID: 1107732010857133768}
    m_Mask: {fileID: 0}
    m_Motions: []
    m_Behaviours: []
    m_BlendingMode: 0
    m_SyncedLayerIndex: -1
    m_DefaultWeight: 0
    m_IKPass: 0
    m_SyncedLayerAffectsTiming: 0
    m_Controller: {fileID: 9100000}
--- !u!1102 &1102462526423969762
AnimatorState:
  serializedVersion: 5
  m_ObjectHideFlags: 1
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInternal: {fileID: 0}
  m_Name: New State
  m_Speed: 1
  m_CycleOffset: 0
  m_Transitions: []
  m_StateMachineBehaviours: []
  m_Position: {x: 50, y: 50, z: 0}
  m_IKOnFeet: 0
  m_WriteDefaultValues: 1
  m_Mirror: 0
  m_SpeedParameterActive: 0
  m_MirrorParameterActive: 0
  m_CycleOffsetParameterActive: 0
  m_TimeParameterActive: 0
  m_Motion: {fileID: 7400000, guid: 1a354359c4913cf4b947f29cee104f48, type: 3}
  m_Tag: 
  m_SpeedParameter: 
  m_MirrorParameter: 
  m_CycleOffsetParameter: 
  m_TimeParameter: 
--- !u!1107 &1107732010857133768
AnimatorStateMachine:
  serializedVersion: 5
  m_ObjectHideFlags: 1
  m_CorrespondingSourceObject: {fileID: 0}
  m_PrefabInternal: {fileID: 0}
  m_Name: Base Layer
  m_ChildStates:
  - serializedVersion: 1
    m_State: {fileID: 1102462526423969762}
    m_Position: {x: 270.93024, y: 126.44006, z: 0}
  m_ChildStateMachines: []
  m_AnyStateTransitions: []
  m_EntryTransitions: []
  m_StateMachineTransitions: {}
  m_StateMachineBehaviours: []
  m_AnyStatePosition: {x: 50, y: 20, z: 0}
  m_EntryPosition: {x: 50, y: 120, z: 0}
  m_ExitPosition: {x: 800, y: 120, z: 0}
  m_ParentStateMachinePosition: {x: 800, y: 20, z: 0}
  m_DefaultState: {fileID: 1102462526423969762}

對比差別：

// 第43行 由：
m_Motion: {fileID: 0}
// 變成了
m_Motion: {fileID: 7400000, guid: 1a354359c4913cf4b947f29cee104f48, type: 3}
// 這個guid就是動畫.meta的guid
fileFormatVersion: 2
guid: 1a354359c4913cf4b947f29cee104f48

解決方法：

若是右鍵導出動畫控制器時關聯了無效的動畫片斷，能夠用以下方式解決：
1.找到關聯的無效動畫，用文本編輯器打開動畫.meta文件 查看動畫guid。
2.用文本編輯器打開動畫控制器xxx.controller。
找到與guid相同的m_Motion節點 還原爲m_Motion: {fileID: 0} 並保存。
3.右鍵導出動畫控制器，未關聯無效引用則證實刪除成功。