Hi there.

I am trying to create an image with an (ant)arctic-looking landscape - much
like Christoph Hormann's image here:
http://www.imagico.de/pov/pict/frozen_island.jpg.

However, I just cannot work out how to get the texturing right.

My height field is created using a "f_ridged_mf" function, and I have tried
using a texture consisting of a slope texture map of snow and rock. The
effect is far from what I am after -

The main problem appears to be that the "slope" keyword is too "dependent"
on altitude. Whereas Christoph's image above has snow / rock together at a
range of altitudes, I get a very clear "cutoff point" with snow below and
rock below.

If anyone have any pointers to this, or know of any tutorials on how to
texture landscapes in general, I am very grateful.

Thanks in advance!

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