Jolt Physics is a rigid body and collision detection library written in C++17. It focuses on high-performance concurrency, allowing simulation updates and collision queries to run across multiple threads without traditional locking bottlenecks. The engine is battle-tested in large-scale titles like Horizon Forbidden West.
If you are building a simulation or game that requires precise multi-threading, this is currently the best-in-class open source option. It is not, however, a general-purpose scientific simulator and makes specific approximations to favor game-like performance over absolute physical accuracy. Expect to spend significant time on the API integration if you are moving away from a simpler library like PhysX.
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