waggy wrote:

> Mr. de Groot:  Besides edge rendering, I was also looking for a way to shade
> objects by hatching, as illustrated by the image of a simple sphere attached.

I once tried something similar to this:

http://news.povray.org/povray.binaries.images/thread/%3C4bc4f2ea@news.povray.org%3E/?ttop=358803&toff=250

Basically, this was using shading by aoi pattern from a fixed point
to emulate a point light source. Once you have a basic shading pattern,
you can use a texture map to provide different black-and-white textures
for different shades of gray.

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