Hello,
I made a heightfield using just plain surfaces, with a sort of "urban" look: I
posted the WIP image in the images group:

http://news.povray.org/povray.binaries.images/thread/%3Cweb.51f7eaa68a30b87e3495bd7c0%40news.povray.org%3E/

Now I want to give a texture just to the surfaces not parallel to the x and z
axes, like "roofs", and a different one to "walls".
I can't use a gradient x and z texture map since the vertical surfaces are in
many different places.
Another problem is the slope of the roofs: the "not totally y" planes usually
interact with the x and z components.
I've unsuccessfully tried everything I've found on the net.
Is it possible to achieve this?

Thanks!

Marco Bernardini

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