Killroy Quartermaine nous illumina en ce 2008-07-11 01:02 -->
> So I was thinking about modelling a fresnel lens using CSG, and I have two
> questions.
> 
> 1. Is there any reason why a fresnel lens wouldn't actually work in POVRay?
None at all. In fact, you are not the first one who want to do that. In fact, it 
have been done already.
> 
> 2. Because of the way they're built, what I need is torii, except instead of
> round, I need them to be diamond-shaped. like, uh, for the second value of
> "round". Is there any way to do this without going beyond the realm of
> primitives? I'm not comfortable enough with light and finishes and whatnot to
> get into making any kind of complex base shapes yet.
> 
> 
Fresnel lences are constructed from rings carved out from a sphere.
You can build one that way, or use a thin cylinder, or a disk, and use normals.
If you look trough, it will act like a real one, and, using photons, it will 
focalise light.

-- 
Alain
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Moonies: Only really happy shit happens.

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