Fix BlendShape anim compatible with multiple SkinMeshRenderer in on… (#1756)

* fix: blendShape anim compatible with multiple SkinMeshRenderer in one entity

Author: luzhuang

packages/core/src/animation/internal/animationCurveOwner/assembler/BlendShapeWeightsAnimationCurveOwnerAssembler.ts

@@ -7,18 +7,22 @@ import { IAnimationCurveOwnerAssembler } from "./IAnimationCurveOwnerAssembler";
  * @internal
  */
 export class BlendShapeWeightsAnimationCurveOwnerAssembler implements IAnimationCurveOwnerAssembler<Float32Array> {
-  private _skinnedMeshRenderer: SkinnedMeshRenderer;
+  private _skinnedMeshRenderer: SkinnedMeshRenderer[] = [];
 
   initialize(owner: AnimationCurveOwner<KeyframeValueType>): void {
-    this._skinnedMeshRenderer = owner.target.getComponent(SkinnedMeshRenderer);
+    // @todo: Compatible with multiple SkinnedMeshRenderer in a entity, optimize later.
+    owner.target.getComponents(SkinnedMeshRenderer, this._skinnedMeshRenderer);
   }
 
   getTargetValue(): Float32Array {
-    return this._skinnedMeshRenderer.blendShapeWeights;
+    return this._skinnedMeshRenderer[0].blendShapeWeights;
   }
 
   setTargetValue(value: Float32Array): void {
-    this._skinnedMeshRenderer.blendShapeWeights = value;
+    const skinnedMeshRenderer = this._skinnedMeshRenderer;
+    for (let i = 0, n = skinnedMeshRenderer.length; i < n; i++) {
+      skinnedMeshRenderer[i].blendShapeWeights = value;
+    }
   }
 }
 

packages/loader/src/gltf/parser/GLTFAnimationParser.ts

@@ -196,12 +196,12 @@ export class GLTFAnimationParser extends GLTFParser {
           if (curve.interpolation === InterpolationType.CubicSpine) {
             keyframe.inTangent = Array.from(output.subarray(offset, offset + outputSize));
             offset += outputSize;
-            keyframe.value = output.subarray(offset, offset + outputSize) as Float32Array;
+            keyframe.value = output.slice(offset, offset + outputSize) as Float32Array;
             offset += outputSize;
             keyframe.outTangent = Array.from(output.subarray(offset, offset + outputSize));
             offset += outputSize;
           } else {
-            keyframe.value = output.subarray(offset, offset + outputSize) as Float32Array;
+            keyframe.value = output.slice(offset, offset + outputSize) as Float32Array;
             offset += outputSize;
           }
           curve.addKey(keyframe);