Mick Hazelgrove <mic### [at] mhazelgrovefsnetcouk> schrieb in im Newsbeitrag:
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

You could use an orthographic camera,
and look down on the hf.
Give the hf a white texture with ambient 0 and place one
light there where your camera should be in the final image.
You could use the resulting image to place the grass.
I don't know if this woks but I think it should.

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