Inspired by three.js and ammo.js, and driven by the fact that the web lacks a physics engine, here comes cannon.js. The rigid body physics engine includes simple collision detection, various body shapes, contacts, friction and constraints.
Demos - Documentation - Rendering hints - NPM package - CDN
Just include cannon.js or cannon.min.js in your html and you're done:
<script src="cannon.min.js"></script>
Install the cannon package via NPM:
npm install --save cannon
Alternatively, point to the Github repo directly to get the very latest version:
npm install --save schteppe/cannon.js
The sample code below creates a sphere on a plane, steps the simulation, and prints the sphere simulation to the console. Note that Cannon.js uses SI units (metre, kilogram, second, etc.).
// Setup our world
var world = new CANNON.World();
world.gravity.set(0, 0, -9.82); // m/s²
// Create a sphere
var radius = 1; // m
var sphereBody = new CANNON.Body({
mass: 5, // kg
position: new CANNON.Vector3(0, 0, 10), // m
shape: new CANNON.Sphere(radius)
});
world.addBody(sphereBody);
// Create a plane
var groundBody = new CANNON.Body({
mass: 0 // mass == 0 makes the body static
});
var groundShape = new CANNON.Plane();
groundBody.addShape(groundShape);
world.addBody(groundBody);
var fixedTimeStep = 1.0 / 60.0; // seconds
var maxSubSteps = 3;
// Start the simulation loop
var lastTime;
(function simloop(time){
requestAnimationFrame(simloop);
if(lastTime !== undefined){
var dt = (time - lastTime) / 1000;
world.step(fixedTimeStep, dt, maxSubSteps);
}
console.log("Sphere z position: " + sphereBody.position.z);
lastTime = time;
})();
If you want to know how to use cannon.js with a rendering engine, for example Three.js, see the Examples.
Sphere | Plane | Box | Convex | Particle | Heightfield | Trimesh | |
---|---|---|---|---|---|---|---|
Sphere | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Plane | - | - | Yes | Yes | Yes | - | Yes |
Box | - | - | Yes | Yes | Yes | Yes | (todo) |
Cylinder | - | - | Yes | Yes | Yes | Yes | (todo) |
Convex | - | - | - | Yes | Yes | Yes | (todo) |
Particle | - | - | - | - | - | (todo) | (todo) |
Heightfield | - | - | - | - | - | - | (todo) |
Trimesh | - | - | - | - | - | - | - |
The simpler todos are marked with @todo
in the code. Github Issues can and should also be used for todos.
Create an issue if you need help.
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