"Severi Salminen" <sev### [at] NOT_THISsibafi> wrote in message
news:3fd9da81$1@news.povray.org...
>
> In my opinion this is something that should be mentioned in the
> documents (if it is: good, then forget this) - if any rule of thumb can
> be given in this matter. People might spend too much time searching
> coincident surfaces when the problem is somewhere else.
>

for a similiar type of problem, try (modify the plane's translation to, say,
0.002, to fix it):

#version 3.5;

#include "colors.inc"

camera {
  location  <0.0, 1.0, -5.0>
  look_at   <0.0, 1.0,  0.0>
}

plane{y,-0.001 pigment{checker pigment{Black}, pigment{White}}}

sphere{0,1
  translate y*1
  pigment{rgbt 1}
}

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