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I am asked to design a N-Body simulation system. Generally speaking, I need to write a program to handle the movement of multiple points under gravity in 3D space. I have no problem to detect the collision. However, it is possible that many points collide together at the same point. I have no idea how to calculate the velocity after the collision. What algorithm should I use for this situation?

Schrodinger ZHU
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  • Have a look at [this](https://stackoverflow.com/questions/16423466/how-to-handle-multiple-simultaneous-elastic-collisions) SO question. – Jeroen Heier Oct 06 '19 at 07:50

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This type of simulations are often addressed with a technique called event-driven molecular dynamics, and multiple collisions are ignored if one is dealing with point-like particles (that is, objects without a "size", which are thus identified only by their position), for which the probability of having many-body collisions is exceedingly small.

lr1985
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