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

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#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 }
}

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