I was just thinking that it should not be too difficult to implement a
toroidal pattern type in POV.

This pattern would return the distance of a point from a unit circle in
the x,z plane (minor radius can be done with a colour/density etc map).

I think that it could be done by
1. rotate point so that it's on the x,y plane
2. let p = <abs(p.x)-1,p.y>
3. find distance of p from origin
but someone with better 3D math skills could probably come up with a
better way.

Anyone think this is a good/bad/stupid/useful idea?

Cheers, PoD.

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