On 8/15/20 11:21 AM, jr wrote:
> hi,
> 
> an unrelated thread made me render the 'scenes/advanced/optics.pov' file.  with
> 'povr' I get a strange "band" in the lower part of the image.  attached.
> 

Thanks jr (and Jerome)!

I see it too in all my recent povr versions. It was OK in versions early 
this year, so something I've done between then and early July.

I'll do a binary search - compile/run through my commits to find the 
commit causing the problem. FYI. No photons required to see it.

(jr, If you are looking for a scene with a parabolic mirror I recall 
Warp doing one some years ago which he posted. I thought had a copy 
somewhere, but I cannot find it at the moment. He might have used a 
polynomial for the shape.)

Bill P.

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