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 
rays do not hit it even though they should. It does not matter if the 
camera is near the object or far from it, the field of view ("angle") 
does not matter either, this appears regardless of whether the torus 
appears big or small in the rendering. Using antialiasing (or not using 
it) has no effect.

I'm using POV-Ray 3.1g running under Windows NT 4.

A small (17 KB) JPG image showing the problem can be seen at 
http://www.mmedia.is/~bjj/torus.jpg

FWIW my code looks like this:

torus  {
   66,33 sturm
   rotate x*90
   translate <-66,116,0>
   clipped_by {object {plane {<0,1,0>,116}}}
   clipped_by {object {plane {<-1,0,0>,66}}}
}

and later on:
   pigment {White}
   finish  {Dull}

(this same pigment/finish is also for a few cylinders which together with 
the torus are part of a union)

Bjorn

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