Mick Hazelgrove wrote:
> 
> I've been trying to create realistic rocks for some time - I think I'm
> getting close!
> 
> All isosurface functions.

Very nice and quite different from most isosurface terrains i have made in
the past.  At some places i suspect insufficiant max_gradient.

> 
> I'd like to add a rock staircase going over the center pass using
> isosurfaces, any ideas how I could do it?

I would use a CSG with separate isosurface objects.  Otherwise it will get
really slow.  For a staircase a combination of difference (for the parts
carved out of the rock) and merge (for the parts built up) would probably
work.

Christoph

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