> Make a mesh for each unique piece of bitmap.  Don't put triangles except 
> where there's grass.

Godd idea, will try it.

> 
> Color the ground like dirt.
> 
> When I want to do grass, I generally make a mesh (or a few meshes), 
> representing a patch of grass.  The I copy it a bunch of times, with 
> rotation and skewing, to eliminate a tiled appearance.

Also good idea, but such a grass is very slow with radiosity, bitmap one 
looks promising in my current tests. It is also slow, but acceptable ;-))

> 
> Regards,
> John

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