"Kirk Andrews" <kir### [at] tektonartcom> schreef in bericht 
news:web.493969b33e06781e198b63d90@news.povray.org...
> I've struggled for a long time to try and achieve an erosion effect in POV 
> that
> is the least bit convincing.  I'm still not there, but perhaps I've made 
> some
> headway.  I've been using proximity functions to simulation a little 
> erosion.
> Maybe you know some better ways?
>

Not easy overall. Until now, I have mainly used the f_ridge(), 
f_ridged_mf(), and f_hetero() functions as a basis for decent erosion 
features in isosurfaces. This is done also for instance by the program 
Leveller. However, that is not always convincing. Ideally, one would like to 
take a pre-defined landscape and apply erosion functions to it to wear it 
down and apply a sediment apron around standing ridges. That is basically 
what programs like GeoControl or World Machine are doing I believe, and very 
convincingly so.

Thomas

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