Hi. I made a couple tiny modifications to Gilles' grass include. I made it
so that using trace() you could place the patches over a height field. My
example here uses blobs to make the heightfield. It turned out nicely. I say
"Ode to the MaXeR" because he is the one that got me inspired with his
animation of a thunderstorm over a field with a sword in it. I used the same
aspect ratio he uses to render mine. It's supposed to be a night scene, so I
have no justification for the lighting. I'll work on it some other time.
Enjoy.

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