I'm an absolute beginner with 3DS. All I need is for this phone model I got to open and spin around. I purchased the 3d model online. I've managed to get the animation created, now I just want it to render. When I render it though all I get are the materials. None of the button overlays or the screen images renders. I can see them in the perspective and other views, but they won't render. I'm using the vray renderer. Is there some simple option I need to set?