Jolt Physics vs Bullet Physics: which is better for VR games?

Jolt Physics excels in multi-core performance and deterministic simulation, making it ideal for high-performance VR games with networked elements. Bullet has a larger community and more bindings, but Jolt is optimized for modern multi-threaded engines used in AAA titles.

How to integrate Jolt Physics with Unreal Engine?

Use third-party plugins like UnrealJolt, as mentioned in the integrations section. Since Jolt lacks official Unreal support, you'll need to build from source and handle C++ linking, which requires intermediate to advanced engine modification skills.

Does Jolt Physics support soft body collisions in real-time?

Yes, it includes soft body simulation with collision support for rigid bodies, but soft body vs. soft body collisions are limited, and the hair simulation only supports specific shapes like ConvexHull and CompoundShapes, as noted in the features.

What CPU features are required to run Jolt Physics on ARM devices?

On ARM64, it uses NEON and FP16; on ARM32, it can run without special instructions. For x86, SSE2 is the minimum, with optional optimizations for AVX, as detailed in the README's CPU requirements.

Is Jolt Physics suitable for 2D game development?

Primarily designed for 3D, it can be adapted for 2D using shapes like boxes and planes, but lacks built-in 2D optimizations. Engines like Box2D are better for pure 2D games due to simplicity and performance.

How deterministic is Jolt Physics for cross-platform multiplayer?

It's designed to be deterministic when inputs are synchronized, but floating-point differences across platforms can affect results. The documentation advises testing, and double precision mode is available for large worlds to mitigate issues.

Can Jolt Physics handle vehicle simulations like motorcycles?

Yes, it includes advanced vehicle systems for wheeled, tracked, and motorcycle simulations with realistic constraints and collision responses, as demonstrated in the samples and feature list.

Jolt Physics — Multi-Core Rigid Body Physics

What is Jolt Physics?

Jolt Physics is a high-performance, multi-core friendly rigid body physics and collision detection library written in C++. It is designed for games and VR applications, providing deterministic simulation and efficient concurrent access to physics data. The library solves the problem of integrating physics simulations with other game systems without causing performance bottlenecks.

Target Audience

Game developers and VR application creators who need a robust, scalable physics engine for interactive 3D simulations, especially those working on multi-threaded engines or networked games.

Value Proposition

Developers choose Jolt Physics for its deterministic simulation, excellent multi-core performance, and proven use in AAA titles, offering a modern alternative to older physics engines with better concurrency and control.

A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.

Use Cases

Best For

Building physics for AAA video games requiring high performance
VR applications needing realistic and responsive object interactions
Multi-threaded game engines where physics must run concurrently with other systems
Networked games requiring deterministic physics replication
Simulating complex vehicles like wheeled cars or tracked tanks
Creating animated ragdolls and character controllers with accurate collision

Not Ideal For

Indie developers creating simple 2D games who need a lightweight, easy-to-integrate physics solution like Box2D
Projects built entirely in high-level scripting languages like Python or JavaScript without robust, mature bindings
Applications requiring advanced fluid dynamics, particle systems, or real-time finite element analysis beyond rigid body and basic soft body physics
Teams needing extensive out-of-the-box documentation, GUI tools, or beginner-friendly tutorials for quick prototyping

Pros & Cons

Pros

Multi-core Optimization

Designed for concurrent simulation, collision queries, and background loading with minimal locks, enabling seamless integration with multi-threaded game engines as highlighted in the design considerations.

Deterministic Simulation

Supports replication by syncing inputs, ideal for networked games, with documented limits ensuring predictable behavior across platforms.

Comprehensive Feature Set

Includes a wide range of shapes, constraints, character controllers, vehicles, soft bodies, and GPU-accelerated hair simulation, catering to diverse AAA game physics needs.

Proven in AAA Titles

Used in major games like Horizon Forbidden West and Death Stranding 2, demonstrating reliability and high performance in production environments.

Cross-platform Support

Runs on multiple OSes including Windows, Linux, macOS, and WebAssembly, with minimal dependencies, as per the supported platforms list.

Cons

Complex Integration

Requires building from source with CMake and C++ 17, lacking pre-built binaries or plug-and-play integrations for popular game engines like Unity or Unreal without third-party plugins.

Limited Ecosystem

Has a smaller community and fewer third-party tools compared to established engines like Bullet or PhysX, making troubleshooting and finding resources more challenging.

Sparse High-Level Documentation

Relies heavily on sample code and GDC talks; the official API documentation is minimal, forcing developers to dig through examples for implementation details.

Niche Focus on Gaming

Optimized for game approximations, so it may not suit scientific simulations or applications requiring exact physical accuracy, as admitted in the philosophy section.

Frequently Asked Questions

What is Jolt Physics?

Target Audience

Game developers and VR application creators who need a robust, scalable physics engine for interactive 3D simulations, especially those working on multi-threaded engines or networked games.

Value Proposition

Use Cases

Best For

Building physics for AAA video games requiring high performance
VR applications needing realistic and responsive object interactions
Multi-threaded game engines where physics must run concurrently with other systems
Networked games requiring deterministic physics replication
Simulating complex vehicles like wheeled cars or tracked tanks
Creating animated ragdolls and character controllers with accurate collision

Not Ideal For

Indie developers creating simple 2D games who need a lightweight, easy-to-integrate physics solution like Box2D
Projects built entirely in high-level scripting languages like Python or JavaScript without robust, mature bindings
Applications requiring advanced fluid dynamics, particle systems, or real-time finite element analysis beyond rigid body and basic soft body physics
Teams needing extensive out-of-the-box documentation, GUI tools, or beginner-friendly tutorials for quick prototyping

Pros & Cons

Pros

Multi-core Optimization

Deterministic Simulation

Supports replication by syncing inputs, ideal for networked games, with documented limits ensuring predictable behavior across platforms.

Comprehensive Feature Set

Includes a wide range of shapes, constraints, character controllers, vehicles, soft bodies, and GPU-accelerated hair simulation, catering to diverse AAA game physics needs.

Proven in AAA Titles

Used in major games like Horizon Forbidden West and Death Stranding 2, demonstrating reliability and high performance in production environments.

Cross-platform Support

Runs on multiple OSes including Windows, Linux, macOS, and WebAssembly, with minimal dependencies, as per the supported platforms list.

Cons

Complex Integration

Requires building from source with CMake and C++ 17, lacking pre-built binaries or plug-and-play integrations for popular game engines like Unity or Unreal without third-party plugins.

Limited Ecosystem

Has a smaller community and fewer third-party tools compared to established engines like Bullet or PhysX, making troubleshooting and finding resources more challenging.

Sparse High-Level Documentation

Relies heavily on sample code and GDC talks; the official API documentation is minimal, forcing developers to dig through examples for implementation details.

Niche Focus on Gaming

Optimized for game approximations, so it may not suit scientific simulations or applications requiring exact physical accuracy, as admitted in the philosophy section.

Frequently Asked Questions

Jolt Physics

What is Jolt Physics?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

Jolt Physics

What is Jolt Physics?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?