Seonglae Cho.frustumCulled : Boolean
rotate, translate 할때 normalize 하고 해야함
행렬에 input vector normalize filter가 없어서 그냥넣으면 배수로 커지거나 배수로 rotate 되는 기현상이 생긴다
position, rotation, scale
중요한 property
When this is set, it checks every frame if the object is in the frustum of the camera before rendering the object. If set to `false` the object gets rendered every frame even if it is not in the frustum of the camera. Default is `true`.