> I want to map a prism with n vertices, height_1=0 and height_2=0.001 onto 
> the
> surface of a sphere. Then I want to create the intersection of the sphere 
> and
> the mapped prism so that only the prism is visible. Can anybody help me?

This sort of shape probably could be achieved by
turning your prism into a height_field, then using
the HF_Sphere macro from shapes.inc to map the
height_field to the spherical mesh. You could then
use CSG to isolate the prism portion.

To turn a prism into a height_field image you can
set up an orthographic camera and use a gradient
pigment that fades from black to white with a
ambient 1 finish.

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