>  There are ways to speed it up, like keeping a record of which grains are
in
> similar "regions" to other grains, then you don't have to compare every
> single grain with every other one.

Cool.  Theres a good head start for me.

>
> It would look absolutely stunning if you could do this well, but I suspect
> the simulation times would be massive. Even a very small amount of sand
> would probably contain millions of grains.

Well, if I'm going to do this, I'm going to create a "generic" system of
some sort that could model sand, rocks or water (blobs) I guess.

Hopefully the algorythm  will be simple, but the processing heavy ( all the
fun jobs are like that )

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