Random-falling sand (or paint) Rosetta Code task

[tenochtitlanuk]

I've been having fun with simulating the arrival of sand/paint in various distributions, and the self-organising patterns you get when piled-up sand keeps avalanching away from the source. This is a suggested task on Rosetta Code-

..and the 'sandpiles'....

Anyway, I think the graphics are pretty, and it was fun to see ways to speed production..

Following is a link to a page on my site about this, with code

[tenochtitlanuk]

'fraid I can't emulate the on-line one at sand pile emulation

As the image below shows, even with 16384 ( 2^14) grains I exceed 2000 seconds. The link above goes to 2^30!!



I recommend the version I wrote that shows the behaviour in real time- but realistically only on less than 2^8 sites. You see this wriggling Brownian motion like apparently randomly collapsing pillars of sand, yet creating increasingly distinct symmetry patterns.