> I also remember, several years ago, a macro of function or something had 
> been made to render the most realistic grass I had ever seen on povray, 
> and it was very much optimised as it was (i think) one of the fastest 
> methods...  lemme search...

Here, check this out:
http://runevision.com/show.asp?id=100

Personally, I don't quite like the shape of the grass (looks too 
cartoonish), so it might an interesting challenge to make a more 
realistic 3D grass and use that for the texture.  Again, both the 3D 
version and texture version could be combined for additional realism.

HTH,
   Simon

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