"Tom Melly" <tom### [at] tomandlucouk> wrote in message
news:3ce50a2b@news.povray.org...
> "Gilles Tran" <tra### [at] inapginrafr> wrote in message
> news:3ce4f377@news.povray.org...
>
> <snip>
>
> I've not yet played with any of the h-f/function stuff in 3.5.
>
> Can anyone give a quick explanation as to what they're for? For
example, in
> Gilles's post, why use a hf with the ridged mf rather than just using
the ridged
> mf directly?
>
> I know, I know - I could read the docs and test things out, but I
thought that a
> discussion on this might be of general interest anyway.

Not that I've tried it out yet, but I think that the height field would
render faster than an isosurface, as it is precalculated at a fixed
resolution.  That way, when it traces, the surface doesn't have to be
calculated.

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