Thnaks all for advices.

I recall that it is just a texture, and my purpose is not to build a whole
realistic snowy scenery (which requires much more than a texture). I only
want to test the texture in itself. Anyway, in order to add some realism, I
made a simple mountain scene where the ground is just a textured
(iso)surface, but it may be OK to see how the snow texture reacts.

The elevation of the sun is 25 degrees (quite low). The short-distance
appearance is is bit too dark wrt the long-distance. At higher angles the
texture appears brighter at near distance and is more consistant with
long-distance behaviour. I have to test it further... and probably rework.

Regards.

    Bruno

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