cannon
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A lightweight 3D physics engine written in JavaScript.
95 lines (78 loc) • 3.34 kB
HTML
<html>
<head>
<title>cannon.js - friction demo</title>
<meta charset="utf-8">
<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 src="../build/cannon.js"></script>
<script src="../build/cannon.demo.js"></script>
<script src="../libs/dat.gui.js"></script>
<script src="../libs/Three.js"></script>
<script src="../libs/TrackballControls.js"></script>
<script src="../libs/Detector.js"></script>
<script src="../libs/Stats.js"></script>
<script src="../libs/smoothie.js"></script>
<script>
/**
* Demonstrates how to make several materials with different friction properties.
*/
var demo = new CANNON.Demo(), size = 1.0;
demo.addScene("Friction",function(){
var shape = new CANNON.Box(new CANNON.Vec3(size,size,size));
// Create world
var world = demo.getWorld();
world.broadphase = new CANNON.NaiveBroadphase();
world.iterations = 10;
// Materials
var groundMaterial = new CANNON.Material("groundMaterial");
// Adjust constraint equation parameters for ground/ground contact
var ground_ground_cm = 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_cm);
// ground plane
var groundShape = new CANNON.Plane();
var groundBody = new CANNON.Body({ mass: 0, material: groundMaterial });
groundBody.addShape(groundShape);
world.add(groundBody);
demo.addVisual(groundBody);
// Create a slippery material (friction coefficient = 0.0)
var slipperyMaterial = new CANNON.Material("slipperyMaterial");
// The ContactMaterial defines what happens when two materials meet.
// In this case we want friction coefficient = 0.0 when the slippery material touches ground.
var slippery_ground_cm = 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_cm);
// Create slippery box
var boxBody = new CANNON.Body({ mass: 1, material: slipperyMaterial });
boxBody.addShape(shape);
boxBody.position.set(0,0,5);
world.add(boxBody);
demo.addVisual(boxBody);
// Create box made of groundMaterial
var boxBody2 = new CANNON.Body({ mass: 10, material: groundMaterial });
boxBody2.addShape(shape);
boxBody2.position.set(size*4,0,5);
world.add(boxBody2);
demo.addVisual(boxBody2);
// Change gravity so the boxes will slide along x axis
world.gravity.set(-3,0,-60);
});
demo.start();
</script>
</body>
</html>