Nphysics performance

@sebcrozet A quick question about performance. How does nphysics compare to other physics engines, like bullet for example? Have you done any benchmarks? Simply curious. Thanks.

Since nphysics internals are still under heavy developments I did not make many comparative benchmarks. About a year ago simulations like the one on example3d/ (a pile of boxes) was about twice as slow as the equivalent bullet simulation (I did not benchmark the 2D scenarios though) but there is still room for improvements (e.g. there is no collision detection algorithm designed especially for box-versus-box yet).

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