> Am 03.04.2010 05:18, schrieb Woody:
>> Can Someone help me out. I'm trying to figure out the weird coloring
>> on the
>> lighted portion of the bottom half of the sphere.
>
> When dealing with isosurfaces...
>
> - Try avoiding discontinuous functions like floor(), mod() or the like.
> The algorithm doesn't work well with those.
>
> - Make sure your function /crosses/ f(x)=0 (or whatever threshold you
> choose) instead of just touching it; it seems to me that your function
> never goes below the threshold, so that for some pixels POV-Ray is
> convinced that it never even reaches it.
>
> For your purposes, I'd suggest using sin() or cos() to produce the
> repetitive banding, instead of the mod(floor(),2) operation.

Also, using sin() or cos() will greatly reduce your max_gradient and 
will probably result in a faster rendering.


Alain

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