[]引用3d物理引擎失败，有文件丢失 Laya3D._physics3D.btVector3 找不到

TypeError: Laya3D._physics3D.btVector3 is not a constructor
preload.js:55
at new PhysicsSimulation (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:12452:27)
at new Scene3D (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:69360:28)
at BoBingPanelView.__proto.initUI (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:81181:19)
at BoBingPanelView.__proto.addUItoStage (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:68471:8)
at BoBingPanelView.__proto.addUItoStage (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:81174:33)
at BoBingPanelView.__proto.onLoadeComplete (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:68463:8)
at Handler.__proto.run (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:36051:26)
at onComplete (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:51721:15)
at Handler.__proto.runWith (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:36066:41)
at ResInfo.onLoaded (file:///E:/ycyheroH5/ycyZYWZW/Client/bin/js/bundle.js:51762:26)
 
 
index.html 已经有引用了    <script type="text/javascript" src="libs/laya.physics3D.js"></script>