Better now IMO.

Making the vegetation 3-dimensional by adding it to the geometry of the
landscape would be a nice thing if you are not afraid of slow rendering.  

I posted a 2d gradient pattern some time ago that could be used for this
purpose similar to the slope pattern you used for the texture.  

Thanks for the code BTW.

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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