I have a very simple isosurface described by the following POV code:


isosurface {
        function {y - sin(x)}
 threshold 0

 open

 contained_by {sphere {<0, 0, 0>, 4}}

 texture {
  pigment {color rgb < 1, 0.9, 0.65>}
  finish {
   brilliance 1.6
   specular 0.3
  }
}

It is essentially a round disk with sinusoidal waves in it.

However, when viewed from different angles the surface, instead of being s
smooth surface, it often has many black pixels and curved black lines
rendered across the surface.

I have tried rendering with AA on (which reduces their appearance a little)
and by setting much higher accuracies for the isosurface (which also
reduces the effect, but does not remove it).

Can anyone tell me if this is a known issue with isosurfaces? It seems to me
this particular case is a very simple surface and should not present the
renderer with significant problems.

I am using the POV 3.5 final release binaries.

Cheers,

Raymond.

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