Hello,
it seems that povray does not work properly on this simple input file:
//////////////////////////////////////////////////////////////////////
#include "colors.inc"

#declare s1 = sphere {<0 0 0>, 40}
#declare p1 = plane {<0 0 1>, 10}
#declare p2 = plane {<0 -0.0141 0.9999>, -10}

light_source {
 <100,-100,300>
 color White
}

camera {
 location <100, -100, 100>
 angle 40
 look_at  <0, 0, 0>
}

intersection {
 object {s1}
 object {p1}
 object {p2 inverse}
 pigment {
  color Blue
     }
}
//////////////////////////////////////////////////////////////////////
it should be a sphere cut by two almost parallel (xy) planes, however the second
plane (p2) is visualized as a perpendicular (xz) plane.
With:
#declare p2 = plane {<0 0 1>, -10}
everything is fine. It seems that the problem occurs when the y component of the
normal vector has negative sign. Is this a bug or there is something wrong in
this simple input file? Thanks,
 Bruno

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