Fix skinned mesh renderer has incorrect bounding box when there is n… (#2015)

* fix: skinned mesh renderer has incorrect bounding box when there is no root bone
---------

Co-authored-by: GuoLei1990 <gl3336563@163.com>

Author: cptbtptpbcptdtptp

packages/core/src/Renderer.ts

@@ -349,8 +349,8 @@ export class Renderer extends Component implements IComponentCustomClone {
    */
   protected override _onDestroy(): void {
     super._onDestroy();
-    this.entity.transform._updateFlagManager.removeListener(this._onTransformChanged);
 
+    this._unRegisterEntityTransformListener();
     this.shaderData._addReferCount(-1);
 
     const materials = this._materials;
@@ -416,6 +416,13 @@ export class Renderer extends Component implements IComponentCustomClone {
     this.entity.transform._updateFlagManager.addListener(this._onTransformChanged);
   }
 
+  /**
+   * @internal
+   */
+  protected _unRegisterEntityTransformListener(): void {
+    this.entity.transform._updateFlagManager.removeListener(this._onTransformChanged);
+  }
+
   /**
    * @internal
    */

packages/core/src/mesh/SkinnedMeshRenderer.ts

@@ -86,9 +86,9 @@ export class SkinnedMeshRenderer extends MeshRenderer {
 
   set rootBone(value: Entity) {
     if (this._rootBone !== value) {
-      this._rootBone?.transform._updateFlagManager.removeListener(this._onTransformChanged);
-      value.transform._updateFlagManager.addListener(this._onTransformChanged);
+      this._unRegisterEntityTransformListener();
       this._rootBone = value;
+      this._registerEntityTransformListener();
       this._dirtyUpdateFlag |= RendererUpdateFlags.WorldVolume;
     }
   }
@@ -173,7 +173,7 @@ export class SkinnedMeshRenderer extends MeshRenderer {
    */
   protected override _updateShaderData(context: RenderContext): void {
     const entity = this.entity;
-    const worldMatrix = this._rootBone ? this._rootBone.transform.worldMatrix : entity.transform.worldMatrix;
+    const worldMatrix = (this._rootBone ?? entity).transform.worldMatrix;
     this._updateTransformShaderData(context, worldMatrix);
 
     const shaderData = this.shaderData;
@@ -235,7 +235,7 @@ export class SkinnedMeshRenderer extends MeshRenderer {
    */
   override _onDestroy(): void {
     super._onDestroy();
-    this._rootBone?.transform._updateFlagManager.removeListener(this._onTransformChanged);
+    this._unRegisterEntityTransformListener();
     this._rootBone = null;
     this._jointDataCreateCache = null;
     this._skin = null;
@@ -280,7 +280,14 @@ export class SkinnedMeshRenderer extends MeshRenderer {
    * @internal
    */
   protected override _registerEntityTransformListener(): void {
-    // Cancel register listener to entity transform.
+    (this._rootBone ?? this._entity).transform._updateFlagManager.addListener(this._onTransformChanged);
+  }
+
+  /**
+   * @internal
+   */
+  protected override _unRegisterEntityTransformListener(): void {
+    (this._rootBone ?? this._entity).transform._updateFlagManager.removeListener(this._onTransformChanged);
   }
 
   /**