Havok - More Stable Physics for "Free"

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The Unity Physics DOTS package, developed in partnership with Havok, needed to be cache free in order to better support scenarios such as simulation rollback for networked simulations. Stacking rigid bodies tends to require a cache, spanning multiple frames, to produce stable results. Here we will talk through some heuristics needed to resolve this paradox and to achieve a more stable physics simulation without sacrificing performance or adding additional state to the simulation.

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