about

This is an old patch i did studying circles collision.
I upload it for documentation and for educational reasons; if you are looking for proper 2d rigid bodies simulation have a look at Vux's Box2d plugins.

Inside the patches you will find also the module ProximityDynamic (2d Spreads).
This module is usefull when you have a large number of interacting agents: it's a grid based proximity detection that gives, for each agent-particle, only the indices of neighbour agents (this means optimization in interaction evaluation).

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