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Diffusion-limited aggregation

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Alasdair
Turner
This is a variation of DLA called 'ballistic aggregation', where particles are fired in a straight line at the aggregation. I have included a couple of tricks to speed it up: particles are fired from a distance of twice the maximum radius of the aggregation, and the angle is restricted according to where these could possibly adjoin the aggregation, otherwise it should be fairly straight-forward. Enjoy!
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