Wow, that helped a lot! Thanks!!!!

Uhm... but how can i use a texture instead of a pigment on that isosurface
now? Originally it was something like

texture {
  checker
  texture {
    pigment {
      White_Marble turbulence 1
      scale 3
    }
  }
  texture {
    pigment {
      gradient x
      pigment_map {
        [0.2 rgb <0.1,0,0>  turbulence 1]
        [0.7 Black]
      }
    }
  }
}

but that doesn't work anymore as povray doesn't seem to accept textures as
functions *sigh* :<

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