John Bradshaw wrote:
>
> I want to modify amount of lighting based on the angle between the camera
> incidence ray and the normal vector of points in the mesh. My goal is to
> create a scanning electron microscope look: bright edges (where the angle
> between viewing ray and normal vector is larger) and a duller center (where
> the angle is smaller).


http://www.pp.htv.fi/kkivisal/em.jpg

 pigment {
    slope {cam_lookat-cam_location,0,0.5}
    color_map{
      [0 rgb 0]
      [0.5 rgb 0.3]
      [1 rgb 1]
    }
  }

_____________
Kari Kivisalo

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