A part of a superellipsoid shape is not covered bzy crand.

Please try the following code to reproduce the faulty crand display (I
also used radiosity):

light_source
{
 < -300000.0, 100000.0, -300000.0 >
 color rgb < 1.0, 0.949, 0.850 >
}

camera
{
 location < -90.0, 20.0, -20.0 >
 look_at < -55.0, 0.0, 0.0 >
}

union
{
 superellipsoid
 {
  < 1.25, 0.25 >
 }
 texture
 {
  pigment { color rgb < 0.816, 0.752, 0.533 > }
  finish { crand 0.75 }
 }
 translate < 0.0, 1.0, 0.0 >
 scale < 0.5, 0.5, 0.5 >
 rotate < 0.0, 90.0, 0.0 >
}

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