Collisions determined by where the balls are in the grid, rather than testing every ball against all others
• press <g> to toggle the grid
• hover over the grid to see a cell and which neighbouring cells it's checking against
There are 1000 balls here with no slowing down
[update jan 2014 - converted to JavaScript mode which is much s-l-o-w-e-r than Java mode]
Oh, that naughty sketch! Please let us know what the issue is below.
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