Paul Bourke wrote:
> Is it possible to use more interesting user defined float functions
> in an isosurface?
> 
> When defining the function for an isosurface I would lke to be able
> to use #while loops, for example, to compute a series to some specified
> precision.

In addition to the technique Slime outlined you can of course use #while 
etc. in functions to generate functions (whithout actual render time 
loops of course).  In some cases this can be an efficient way to 
generate complicated functions (if your loop parameters do not depend on 
the function parameters).

My waves include file:

http://www.tu-bs.de/%7Ey0013390/pov/water/water_inc.html

gives an example for this.

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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