Here's a couple of ways that I've pulled this off: #1. Try enlarging the cube but move it out of the field of view. That way, the reflection will have the same proportions but eliminate the Alpha issue. #2. Make a texture map of the cube and multiply it into a value shader in the reflection channel. (this can easily be done using the spherical camera function while hiding the sphere - this map will also have the other characteristics of your scene like lighting etc.) There is not a way I'm aware of to hide an object from rendering while retaining it's reflections in other objects, though. Hope this helps. Mark