I noticed the Render To Texture automatically builds an alpha channel from the grayscale. Is there a way to turn this off? And is there a way to get a "true" alpha of the rendered scene? Another thing I'm curios about is how hard it would be to script/create a grayscale Zbuffer or depthmap image from the rendered scene. This seems like it would be hard, but could be really cool for manipulating image effects down the road.