Bjorn Jonsson wrote:
> 
> I'm having trouble getting a torus object to render properly. I've tried
> adding the sturm keyword but it seemed to have absolutely no effect on
> the torus' appearance. The torus appears "noisy", it's as if some of the

I would bet this is a "coincident surface" problem where the torus
meets the cylinders you did not mention here. Either cut the cylinders
to be shorter or make either the cylinders or the torus a little
bit smaller or larger.

Markus

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