In article <3DA894B0.9FCA901F@dcs.gla.ac.uk>,
 John Williamson <wil### [at] dcsglaacuk> wrote:

> Hmm, I'm not sure, but is this not because the blob density function is
> quadratic? If the blob function was exponential (e.g a mixture of
> Gaussian components), wouldn't the second derivative be continuous? e.g
> isosurface with a function like
> f_gauss = function(x,y,z) { 1.0 - exp(-(x*x + y*y + z*z)/2.0) }

Maybe, but the root solver algorithm might not be able to use that 
equation. A method more like the isosurface primitive wouldn't have any 
problem though...but you would have to use things like max_gradient 
instead of sturm. It might be faster though...

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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