# // material类型转换
# var movieMaterialInDo3d:MovieAssetMaterial = do3d.material as MovieAssetMaterial;
# // movie属性是DisplayObject类型的，需要转换
# var movie:MovieClip = movieMaterialInDo3d.movie as MovieClip;
# movie.gotoAndStop(30);
MovieAssetMaterial类中有一个公有属性movie，类型是DisplayObject，将其进行类型转换就行了