I don't remember your Image, but I have an Idea.I remember a Chapter in the Manual about your problem.Either you choose the Renderoption Render alpha after you have coosen all objects you want to see clear in your finished Image, or you choose render Depht.The first one will come as a b/w and the second will as a Greyscale Image you can use as a Layer in Photopaint. Read your manual for more.I think the Capter is called : Bryce and other Programms. Good Luck.