Nice, but have you tried using a simple map constant in one direction and
containing a cross and two torii?  For the texture you could use the
object pattern, for an isosurface function this does not work of course.  

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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