cannon-es-control
Version:
A lightweight 3D physics engine written in JavaScript with control system tools
89 lines (73 loc) • 3.14 kB
HTML
<html lang="en">
<head>
<meta charset="utf-8" />
<title>cannon.js - friction demo</title>
<link rel="stylesheet" href="css/style.css" type="text/css" />
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0" />
</head>
<body>
<script type="module">
import * as CANNON from '../dist/cannon-es-control.js'
import { Demo } from './js/Demo.js'
/**
* Demonstrates how to make several materials with different friction properties.
*/
const demo = new Demo()
demo.addScene('Friction', () => {
const world = setupWorld(demo)
const size = 1.0
// Static ground plane
const groundMaterial = new CANNON.Material('ground')
const groundShape = new CANNON.Plane()
const groundBody = new CANNON.Body({ mass: 0, material: groundMaterial })
groundBody.addShape(groundShape)
groundBody.quaternion.setFromEuler(-Math.PI / 2, 0, 0)
world.addBody(groundBody)
demo.addVisual(groundBody)
// Create a slippery material (friction coefficient = 0.0)
const slipperyMaterial = new CANNON.Material('slippery')
// Create slippery box
const boxShape = new CANNON.Box(new CANNON.Vec3(size, size, size))
const boxBody1 = new CANNON.Body({ mass: 1, material: slipperyMaterial })
boxBody1.addShape(boxShape)
boxBody1.position.set(0, 5, 0)
world.addBody(boxBody1)
demo.addVisual(boxBody1)
// Create box made of groundMaterial
const boxBody2 = new CANNON.Body({ mass: 10, material: groundMaterial })
boxBody2.addShape(boxShape)
boxBody2.position.set(-size * 4, 5, 0)
world.addBody(boxBody2)
demo.addVisual(boxBody2)
// Adjust constraint equation parameters for ground/ground contact
const ground_ground = new CANNON.ContactMaterial(groundMaterial, groundMaterial, {
friction: 0.4,
restitution: 0.3,
contactEquationStiffness: 1e8,
contactEquationRelaxation: 3,
frictionEquationStiffness: 1e8,
frictionEquationRegularizationTime: 3,
})
// Add contact material to the world
world.addContactMaterial(ground_ground)
// The ContactMaterial defines what happens when two materials meet.
// In this case we want friction coefficient = 0.0 when the slippery material touches ground.
const slippery_ground = new CANNON.ContactMaterial(groundMaterial, slipperyMaterial, {
friction: 0,
restitution: 0.3,
contactEquationStiffness: 1e8,
contactEquationRelaxation: 3,
})
// We must add the contact materials to the world
world.addContactMaterial(slippery_ground)
})
demo.start()
function setupWorld(demo) {
const world = demo.getWorld()
world.gravity.set(3, -60, 0)
return world
}
</script>
</body>
</html>