How do I set up JoltPhysics.js with Vite?

Import the WASM flavor and use a locateFile function to handle the WASM asset. For example, import initJolt from 'jolt-physics' and pass the WASM URL, as shown in the README's Vite example.

JoltPhysics.js vs Cannon.js: which is better for web games?

JoltPhysics.js offers more advanced features and performance through WASM, but Cannon.js is simpler and more established for basic 3D physics. Jolt is better for complex simulations requiring determinism or native parity.

How to avoid memory leaks in JoltPhysics.js?

Always call Jolt.destroy() for objects you create and manage reference counts with AddRef() and Release() for classes like Shape. The README includes a proper cleanup example to follow.

Can JoltPhysics.js be used for 2D games?

Yes, but it's overkill for simple 2D physics. Jolt is optimized for 3D simulations, so for 2D projects, lighter engines like Matter.js or Box2D might be more efficient.

What's the difference between WASM and asm.js builds?

WASM builds offer better performance and support multithreading but require modern browsers. asm.js is more compatible with older browsers but may be slower. Choose based on your target audience's browser support.

How to enable multithreading in JoltPhysics.js?

Import a multithreaded flavor like 'wasm-compat-multithread' from npm. Note that this increases bundle size and requires browser support for Web Workers, as mentioned in the build options.

Open-Awesome

JoltPhysics.js

MITC++1.1.0

A JavaScript port of the Jolt Physics engine using Emscripten, enabling high-performance physics simulations in web applications.

GitHub

583 stars55 forks0 contributors

What is JoltPhysics.js?

JoltPhysics.js is a JavaScript port of the Jolt Physics engine, a high-performance physics simulation library. It enables developers to integrate advanced rigid body dynamics, collision detection, and physics interactions into web-based applications, games, and simulations. The library is compiled from C++ using Emscripten, providing near-native performance in the browser.

Target Audience

Web developers and game creators building 3D simulations, interactive experiences, or browser-based games that require realistic physics. It's particularly useful for those already familiar with Jolt Physics or seeking a robust alternative to existing web physics engines.

Value Proposition

Developers choose JoltPhysics.js for its comprehensive feature set, performance optimizations through WASM and multithreading, and direct parity with the battle-tested C++ Jolt Physics engine. Its multiple build flavors allow fine-tuning for specific project needs, from compatibility to maximum speed.

Overview

Port of JoltPhysics to JavaScript using emscripten

Use Cases

Best For

Building browser-based 3D games with complex physics interactions
Creating interactive simulations for education or engineering
Developing VR/AR experiences that require accurate collision detection
Porting existing C++ Jolt Physics projects to the web
Integrating high-performance physics into WebGL frameworks like Three.js or Babylon.js
Running deterministic physics simulations across different platforms

Not Ideal For

Casual 2D game projects where simpler engines like Matter.js would suffice without the overhead
Rapid prototyping scenarios where quick setup and automatic memory management are priorities
Applications with strict initial load time requirements, as the WASM bundle can be large
Teams lacking experience in C++ or low-level programming, due to the manual resource management

Pros & Cons

Pros

Full API Exposure

Almost the entire C++ Jolt interface is exposed, enabling direct use of advanced features like vehicle physics and soft bodies, as documented in the JoltJS.idl file.

Build Flexibility

Offers seven flavors including WASM, asm.js, and multithreaded variants, allowing developers to balance performance, compatibility, and bundle size based on project needs.

Deterministic Simulations

Supports cross-platform deterministic compilation with the -DCROSS_PLATFORM_DETERMINISTIC=ON flag, ensuring identical physics results across browsers and systems.

Memory Control

Provides explicit reference counting and Jolt.destroy() methods for efficient resource handling, though it requires manual cleanup to avoid leaks.

Cons

Manual Cleanup Burden

Requires explicit calls to Jolt.destroy() and careful reference counting, which the README admits can lead to memory leaks if neglected, adding developer overhead.

Complex Configuration

Setting up involves choosing from seven build flavors and managing WASM files separately, with additional steps for bundlers like Vite, increasing initial complexity.

Performance Trade-offs

WASM builds offer near-native speed but have large bundle sizes, especially multithreaded versions, which can impact web application load times and compatibility.

Frequently Asked Questions

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