Tim Attwood wrote:
> They worked OK for me with max_trace_level 10
> instead of 50. I think when you are dealing with
> multiple reflections there is a chance of getting
> something like a hall of mirrors effect...
> possibly 2^max_trace_level rays per pixel. 

That really explains why if the quadric is replaced with:

cylinder{ <  0, -5, 0>, <  0, 5, 0>, 1/2 }

there is no problem.

Thanks for your deep insights. I think that it is a responsibility of 
the POV-Ray developers to figure out their bugs. I wasted enough time.

William

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