> i know, picky, pickie

That's how it goes when you're asking for comments. :-)

> grass surface does not appear flat, shouldn't it puddle up a bit?

It would, eventually, but the velocity of the particles and the heightfield
on which they move isn't exactly the kind of terrain which forms puddles.
That aside, the particles don't use cohesion forces and thus wouldn't form
puddles or stick together like actual water-droplets would. But that'd be
over the top for a simple example anyway.

> as an aside, i wish i could even guess as to how to approach even trying
> to do something like this

It's all practice and experience. Once you've became accustomed with some
different animation techniques and formulae for
animation/simulation/calculation, it just moves on from there.

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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