All I used for lighting is an anything glows torus located just outside the frame. The essential feature of an scanning electron micrograph (which is what I think you're trying to duplicate) is that the brightness of any given point is a function of its angle to the viewer). In other words surfaces that are oblique to your eye are bright and surfaces that are normal to your eye are dark. There are other effects too but that's the main one. Please let me know how to do it with a shader! Ed