When I was making my irtc animation entry, povray told me this:

error: Cannot layer over a patterned texture.

  Why not?

  It was good that I was applying the texture to a plane. I had to do it with
several planes one over another. If it was a more complex object, it would
have been impossible.

  An example scene which demonstrates this:

camera { location -z*4 look_at 0 angle 35 }
light_source { <100,200,-300> 1 }
#declare Text1=
  texture
  { wood texture_map
    { [0 pigment { rgb z }]
      [1 pigment { rgb 1 }]
    }
  }
#declare Text2=
  texture { pigment { marble color_map { [0 rgbf 1][1 rgb 1] } } }
sphere
{ 0,1
  texture { Text1 scale .2 }
  texture { Text2 scale .5 }
}

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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