> MegaPOV has an angle of incidence pattern which creates this effect
> quite nicely. A color_map where the faces pointing towards the camera
> are transparent, and the angles facing to the side are opaque, will do
> the job.

Thanks! I will check it out if I understand it.

> You can also do this with the official version of POV, with the "slope"
> pattern. The results will not be accurate, however, unless you use an
> orthographic camera.

OK. I think I will try slope pattern first.

Have a nice day,

Simone

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