Warp wrote:
>   Lathes present artifacts with pov3.7beta4 which do not happen with
> pov3.6. Here is an example (from trace_wicker.pov). 'sturm' does not
> change anything:

I see a similar issue with sphere sweeps (though in that case tolerance fixes
it). I got as far as noting it was related to our getting slightly different
floating-point values into the calculation, but didn't find out why. It's not
likely to be a compiler issue as it happens with both VC and ICL. I'm rather
puzzled by it at the moment.

-- Chris

camera {
   perspective
   location <-130,-200,120>
   up z
   right -x*4/3
   angle 35
   sky z
   look_at <30,40,5>
}

light_source{ <-300,-300,500> color 1.2 }

#local R=5;

sphere_sweep {
 b_spline
 10
 <90 , 160 , 1> , R
 <100 , 140 ,1> , R
 <80 , 120 , 1> , R
 <-20 , 120 ,1> , R
 <-40 , 70 , 1> , R
 <-50 , 30 , 1> , R
 < 0 , -20 , 1> , R
 <80 , -10 , 1> , R
 <140 , 30 , 1> , R
 <160 , 60 , 1> , R
 //tolerance 0.001
 pigment{ color rgb 1 }
}

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