> High!
>
> While my machine closes in on the last few hundred frames of a
> 3600-frame animation of an isosurface desert world, I started to ask
> myself how to achieve a more realistic surface relief. From high
> altitudes, my simple granite pattern mountains look fairly believable,
> but when rendering a scene from "pedestrian perspective" (as attached
> below), they look like soft undulating sand dunes rather than rugged
> mountains - and the outlines of land forms are very crude!
>
> I would like to add some "ruggedness" while also keeping the lower
> altitudes smooth - how can it be done? Is it possible to use a
> texture_map also with isosurfaces?
>
> See you in Khyberspace!
>
> Yadgar

You may try with an onion or spherical pattern.
If you multiply your function by an onion pattern, that is properly 
scaled, Areas with altitudes near sea level will remain relatively 
unchanged while areas at higher altitude sould get more rugged.
Play with the wave type and the range of values.
You can also divide if you use an inverted fradient for your pattern.
In both cases, make sure that the function used don't reach zero.


Alain

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