% seems to do what I need

man, this renders slow!!

how come, when i put
   isosurface { function { ... } }
it seems to ignore max_grad, accuracy or eval, but if i put
   #declare foo = function { ... }
   isosurface { function { foo(x,y,z) } }
it doesn't?

--
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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