I have a scene with a color mapped to the camera "environment" attribute and final gathering turned on. When I render, there seems to be an alpha rendered for the environment. For example, if I render out an image, the alpha shows a solid white shape for my hero object, but over grey instead of black. I don't see a matte opacity setting for the environment color. Any clues? Is there some setting buried in globals somewhere that I'm missing?
I'm running Maya 6.0.1 with Mental Ray.