Tom Melly <tom### [at] tomandluf9couk> wrote:
:>   For many function this can be analytically impossible to calculate.

: So what is POV doing? Does it calculate the surface in some way that doesn't
: depend on "knowing" where the surface is?

  Povray uses a stochastic algorithm, ie. it takes many samples and tries
to approximate the right value. It will seldom hit the mathematically exact
value.
  (This as far as I have understood correctly the isosurface raytracing.)

:> You
:> can try to approximate with some stochastic algorithm.

: Well, you could. Meanwhile, I'll go and look up "stochastic" in the
: dictionary.

  Stochastic (AFAIK) is a method of taking many samples and searching the
correct value this way. Povray's radiosity uses this kind of technique.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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