Besen nous apporta ses lumieres en ce 2005-04-08 10:51:
> I'm having problems with a scene which contains a sphere sweep (see code
> below). The rendered output displays strange artifacts, which I would like
> to get rid of.
> 
> Any help is appreciated :-)
> 
> thx
> Besen
> 
> ------------------------------------------------------------
> #include "colors.inc"
> 
> background { color White }
> 
> camera {
>   orthographic
>   location <0, 0, 0>
>   direction <0, 0, 250>
>   right <250 * image_width / image_height , 0, 0>
>   up <0, -250, 0>
> 
>   rotate <-90, 0, 0>
>   rotate <0, 0, 90>
>   translate <650, 70, 0>
>   rotate <350, 0.824833, 0>
> }
> 
> light_source {
>    <400, 0, 0>,
>    rgb <1, 1, 1>
> }
> 
> sphere_sweep {
>   linear_spline
>   2,
>   <1.0033, -27, -76.6472>, 20,
>   <3.16485, -10, 73.4915>, 20
> 
>   pigment { color Green }
> }
> 
> 
> 
It's a common problem.
Try rotating the sphere_sweep by a small amount. rotate 0.025*y (1/40th of a degree)
did the trick 
for me. You may also try moving or rotating the camera a small bit.

Alain

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