fix: 1

libs/three.js/build/three.module.js

@@ -26252,7 +26252,9 @@ function SkinnedMesh( geometry, material ) {
 	this.bindMode = 'attached';
 	this.bindMatrix = new Matrix4();
 	this.bindMatrixInverse = new Matrix4();
-
+    //xzw add:  参考ver173版
+    this.boundingBox = null;
+    this.boundingSphere = null;
 }
 
 SkinnedMesh.prototype = Object.assign( Object.create( Mesh.prototype ), {