Mick Hazelgrove wrote:
> 
> 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.
> 

Just do a second trace against the camera location and leave out all
positions where this trace is successful.  Of course this could be
problematic, since you probably want also some grass just below the
visibility line.

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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