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From: Mick Hazelgrove
Date: 7 Jul 2001 07:59:41
Message: <3b46f9ad@news.povray.org>

I have a hf created with an isosurface. I want to place grass on it  - easy
BUT I only want to place grass on the sides of the hills facing the camera.
How can I test to see which slopes are facing me and which are hidden.

Mick

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