Thank you all for your answers. Warp solved it. I didn't know that 
"solidness" is only required for CSG. Media and interior are working for 
all closed surfaces...

Manuel

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Manuel Kasten <kas### [at] gmxde> wrote:
> This is indeed needed in the Q&T.

  Done:
http://tag.povray.org/povQandT/languageQandT.html#inside_vector

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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