Consider the following POV-Ray code:

#include "functions.inc"

background{1}

camera {
    location  1.5
    look_at   0
}

isosurface{
  function { f_noise3d(3*x, 3*y, 3*z) - 1/2 }

  max_gradient 4

  hollow
  pigment { rgbf 1 }

  interior{
   media{
    intervals 100
    absorption 1
   }
  }
}

What is the reason for the black spots and is there a way to avoid them?

Thank you,
Maxime

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