Hello !

I've been trying to render the same landscape in POV-Ray and Terragen, 
and I found myself stuck in the texturing. I wonder, in fact, if there 
is a way to do the same texturing in POV and Terragen.

As far as I understand, Terragen's textures are organized in several 
layers, each with a specific color and amount of bumps. So far, layered 
textures would do the trick. The point is that in Terragen, you can 
control the visibility of a layer based on the slope of the underlying 
layers. For example, you can have a rock layer, very bumpy, and a snow 
layer over it, only in the less slopy areas, with its own bumps.

I tried to achieve such effect with a slope pattern in a layered 
texture, but in this case the slope used is just that of the 
height_field, not including the normal perturbation.

I can obtain something similar using slope-patterned pigments and only 
one normal statement, but then I lose the control over the bumps of each 
layer.

Has anyone got an idea about how to solve this problem ?

-- 
Vincent

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