Did i miss something or do you use an image_map in an isosurface function
without interpolation?  This would lead to infinite gradients and
therefore serious problems.  

Because of this the '.hf' is probably not very useful in most cases since
it won't work with interpolation.  

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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