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What is this?
Jolt Physics is a multi-core friendly rigid body physics and collision detection library written in C++, built for games and VR applications. It's the engine behind 'Horizon Forbidden West' and 'Death Stranding 2: On the Beach'.
Jolt Physics is a multi-core friendly rigid body physics and collision detection library written in C++, built for games and VR applications. It's the engine behind 'Horizon Forbidden West' and 'Death Stranding 2: On the Beach'.Is this a full game engine or just a physics library I plug into something else?It's a standalone physics and collision detection library, not a full game engine. It's meant to be embedded into your own game or engine, and already has integrations for Godot, the Source Engine, and Unreal.
It's a standalone physics and collision detection library, not a full game engine. It's meant to be embedded into your own game or engine, and already has integrations for Godot, the Source Engine, and Unreal.How do I add it to my project?Use CMake to build it, or pull it in with CMake FetchContent as shown in the HelloWorld example. It compiles with Visual Studio 2022+, Clang 16+, or GCC 12+ using C++17.
Use CMake to build it, or pull it in with CMake FetchContent as shown in the HelloWorld example. It compiles with Visual Studio 2022+, Clang 16+, or GCC 12+ using C++17.Do I need any external libraries to build it?No, Jolt depends only on the standard template library and doesn't use RTTI or exceptions, so a conforming C++17 compiler is all you need.
No, Jolt depends only on the standard template library and doesn't use RTTI or exceptions, so a conforming C++17 compiler is all you need.Is the simulation deterministic if I need networked physics?The simulation runs deterministically, so you can replicate it on a remote client by replicating only the inputs, though the README points to a separate 'Deterministic Simulation' doc for the exact limits of this guarantee.
The simulation runs deterministically, so you can replicate it on a remote client by replicating only the inputs, though the README points to a separate 'Deterministic Simulation' doc for the exact limits of this guarantee.Which platforms and CPUs does it actually support?Windows, Linux, FreeBSD, Android, macOS, and iOS across x86/x64/ARM/RISC-V/PowerPC, plus MSYS2 MinGW64 and a separate WebAssembly build. On x86/x64 the minimum CPU requirement is SSE2, and ARM64 uses NEON.
Windows, Linux, FreeBSD, Android, macOS, and iOS across x86/x64/ARM/RISC-V/PowerPC, plus MSYS2 MinGW64 and a separate WebAssembly build. On x86/x64 the minimum CPU requirement is SSE2, and ARM64 uses NEON.Does it handle soft bodies like cloth or hair, not just rigid bodies?Yes. It supports soft body simulation (edge, bend, pressure and tether constraints for things like cloth or balls) and a GPU-driven strand-based hair simulation built on Cosserat rods.
Yes. It supports soft body simulation (edge, bend, pressure and tether constraints for things like cloth or balls) and a GPU-driven strand-based hair simulation built on Cosserat rods.Can I use Jolt from languages other than C++?Yes, community bindings exist for C, C#, Java/Kotlin, JavaScript, Rust, Python, Zig, and Jai.
Yes, community bindings exist for C, C#, Java/Kotlin, JavaScript, Rust, Python, Zig, and Jai.Why did the author write yet another physics engine?It started as a personal learning project and was meant to fix concurrency issues the author saw in existing engines, like allowing collision queries and body loading to run safely across multiple threads without locking the whole simulation.
It started as a personal learning project and was meant to fix concurrency issues the author saw in existing engines, like allowing collision queries and body loading to run safely across multiple threads without locking the whole simulation.What kinds of bodies and constraints can I simulate?Rigid bodies of shapes like spheres, boxes, capsules, convex hulls, meshes and height fields, plus a wide range of constraints (hinge, slider, cone, gear, pulley, swing-twist, 6-DOF) and full vehicle simulation for wheeled, tracked, and motorcycle setups.
Rigid bodies of shapes like spheres, boxes, capsules, convex hulls, meshes and height fields, plus a wide range of constraints (hinge, slider, cone, gear, pulley, swing-twist, 6-DOF) and full vehicle simulation for wheeled, tracked, and motorcycle setups.Which topics is it in?vr, physics-engine, physics-simulation, physics, multithreading, c-plus-plus, game-engine, simulation, concurrency, high-performance, game-development, cpp
vr, physics-engine, physics-simulation, physics, multithreading, c-plus-plus, game-engine, simulation, concurrency, high-performance, game-development, cpp