In POV 3.5 meshes are considered as solid objects to my knowledge.  Try
adding:

inside_vector <0,0,1>

inside the mesh{} brackets (see section 6.5.2.3.1) in the POV docs for more
info on this.  With this one line added you should be able to use the mesh
in CSG operations.  Make sure it's a mesh, by the way... not a union of
triangles.  Two totally different things.

--
Doug Eichenberg
www.getinfo.net/douge
dou### [at] nlsnet

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