You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
604 lines
16 KiB
604 lines
16 KiB
<html lang="en">
|
|
<head>
|
|
<title>Convex object breaking example</title>
|
|
<meta charset="utf-8">
|
|
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
|
|
<link type="text/css" rel="stylesheet" href="main.css">
|
|
<style>
|
|
body {
|
|
color: #333;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
|
|
<div id="info">Physics threejs demo with convex objects breaking in real time<br />Press mouse to throw balls and move the camera.</div>
|
|
<div id="container"></div>
|
|
|
|
<script src="js/libs/ammo.wasm.js"></script>
|
|
|
|
<!-- Import maps polyfill -->
|
|
<!-- Remove this when import maps will be widely supported -->
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
|
|
|
|
<script type="importmap">
|
|
{
|
|
"imports": {
|
|
"three": "../build/three.module.js",
|
|
"three/addons/": "./jsm/"
|
|
}
|
|
}
|
|
</script>
|
|
|
|
<script type="module">
|
|
import * as THREE from 'three';
|
|
|
|
import Stats from 'three/addons/libs/stats.module.js';
|
|
|
|
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
|
|
import { ConvexObjectBreaker } from 'three/addons/misc/ConvexObjectBreaker.js';
|
|
import { ConvexGeometry } from 'three/addons/geometries/ConvexGeometry.js';
|
|
|
|
// - Global variables -
|
|
|
|
// Graphics variables
|
|
let container, stats;
|
|
let camera, controls, scene, renderer;
|
|
let textureLoader;
|
|
const clock = new THREE.Clock();
|
|
|
|
const mouseCoords = new THREE.Vector2();
|
|
const raycaster = new THREE.Raycaster();
|
|
const ballMaterial = new THREE.MeshPhongMaterial( { color: 0x202020 } );
|
|
|
|
// Physics variables
|
|
const gravityConstant = 7.8;
|
|
let collisionConfiguration;
|
|
let dispatcher;
|
|
let broadphase;
|
|
let solver;
|
|
let physicsWorld;
|
|
const margin = 0.05;
|
|
|
|
const convexBreaker = new ConvexObjectBreaker();
|
|
|
|
// Rigid bodies include all movable objects
|
|
const rigidBodies = [];
|
|
|
|
const pos = new THREE.Vector3();
|
|
const quat = new THREE.Quaternion();
|
|
let transformAux1;
|
|
let tempBtVec3_1;
|
|
|
|
const objectsToRemove = [];
|
|
|
|
for ( let i = 0; i < 500; i ++ ) {
|
|
|
|
objectsToRemove[ i ] = null;
|
|
|
|
}
|
|
|
|
let numObjectsToRemove = 0;
|
|
|
|
const impactPoint = new THREE.Vector3();
|
|
const impactNormal = new THREE.Vector3();
|
|
|
|
// - Main code -
|
|
|
|
Ammo().then( function ( AmmoLib ) {
|
|
|
|
Ammo = AmmoLib;
|
|
|
|
init();
|
|
animate();
|
|
|
|
} );
|
|
|
|
|
|
// - Functions -
|
|
|
|
function init() {
|
|
|
|
initGraphics();
|
|
|
|
initPhysics();
|
|
|
|
createObjects();
|
|
|
|
initInput();
|
|
|
|
}
|
|
|
|
function initGraphics() {
|
|
|
|
container = document.getElementById( 'container' );
|
|
|
|
camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.2, 2000 );
|
|
|
|
scene = new THREE.Scene();
|
|
scene.background = new THREE.Color( 0xbfd1e5 );
|
|
|
|
camera.position.set( - 14, 8, 16 );
|
|
|
|
renderer = new THREE.WebGLRenderer();
|
|
renderer.setPixelRatio( window.devicePixelRatio );
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
|
renderer.shadowMap.enabled = true;
|
|
container.appendChild( renderer.domElement );
|
|
|
|
controls = new OrbitControls( camera, renderer.domElement );
|
|
controls.target.set( 0, 2, 0 );
|
|
controls.update();
|
|
|
|
textureLoader = new THREE.TextureLoader();
|
|
|
|
const ambientLight = new THREE.AmbientLight( 0x707070 );
|
|
scene.add( ambientLight );
|
|
|
|
const light = new THREE.DirectionalLight( 0xffffff, 1 );
|
|
light.position.set( - 10, 18, 5 );
|
|
light.castShadow = true;
|
|
const d = 14;
|
|
light.shadow.camera.left = - d;
|
|
light.shadow.camera.right = d;
|
|
light.shadow.camera.top = d;
|
|
light.shadow.camera.bottom = - d;
|
|
|
|
light.shadow.camera.near = 2;
|
|
light.shadow.camera.far = 50;
|
|
|
|
light.shadow.mapSize.x = 1024;
|
|
light.shadow.mapSize.y = 1024;
|
|
|
|
scene.add( light );
|
|
|
|
stats = new Stats();
|
|
stats.domElement.style.position = 'absolute';
|
|
stats.domElement.style.top = '0px';
|
|
container.appendChild( stats.domElement );
|
|
|
|
//
|
|
|
|
window.addEventListener( 'resize', onWindowResize );
|
|
|
|
}
|
|
|
|
function initPhysics() {
|
|
|
|
// Physics configuration
|
|
|
|
collisionConfiguration = new Ammo.btDefaultCollisionConfiguration();
|
|
dispatcher = new Ammo.btCollisionDispatcher( collisionConfiguration );
|
|
broadphase = new Ammo.btDbvtBroadphase();
|
|
solver = new Ammo.btSequentialImpulseConstraintSolver();
|
|
physicsWorld = new Ammo.btDiscreteDynamicsWorld( dispatcher, broadphase, solver, collisionConfiguration );
|
|
physicsWorld.setGravity( new Ammo.btVector3( 0, - gravityConstant, 0 ) );
|
|
|
|
transformAux1 = new Ammo.btTransform();
|
|
tempBtVec3_1 = new Ammo.btVector3( 0, 0, 0 );
|
|
|
|
}
|
|
|
|
function createObject( mass, halfExtents, pos, quat, material ) {
|
|
|
|
const object = new THREE.Mesh( new THREE.BoxGeometry( halfExtents.x * 2, halfExtents.y * 2, halfExtents.z * 2 ), material );
|
|
object.position.copy( pos );
|
|
object.quaternion.copy( quat );
|
|
convexBreaker.prepareBreakableObject( object, mass, new THREE.Vector3(), new THREE.Vector3(), true );
|
|
createDebrisFromBreakableObject( object );
|
|
|
|
}
|
|
|
|
function createObjects() {
|
|
|
|
// Ground
|
|
pos.set( 0, - 0.5, 0 );
|
|
quat.set( 0, 0, 0, 1 );
|
|
const ground = createParalellepipedWithPhysics( 40, 1, 40, 0, pos, quat, new THREE.MeshPhongMaterial( { color: 0xFFFFFF } ) );
|
|
ground.receiveShadow = true;
|
|
textureLoader.load( 'textures/grid.png', function ( texture ) {
|
|
|
|
texture.wrapS = THREE.RepeatWrapping;
|
|
texture.wrapT = THREE.RepeatWrapping;
|
|
texture.repeat.set( 40, 40 );
|
|
ground.material.map = texture;
|
|
ground.material.needsUpdate = true;
|
|
|
|
} );
|
|
|
|
// Tower 1
|
|
const towerMass = 1000;
|
|
const towerHalfExtents = new THREE.Vector3( 2, 5, 2 );
|
|
pos.set( - 8, 5, 0 );
|
|
quat.set( 0, 0, 0, 1 );
|
|
createObject( towerMass, towerHalfExtents, pos, quat, createMaterial( 0xB03014 ) );
|
|
|
|
// Tower 2
|
|
pos.set( 8, 5, 0 );
|
|
quat.set( 0, 0, 0, 1 );
|
|
createObject( towerMass, towerHalfExtents, pos, quat, createMaterial( 0xB03214 ) );
|
|
|
|
//Bridge
|
|
const bridgeMass = 100;
|
|
const bridgeHalfExtents = new THREE.Vector3( 7, 0.2, 1.5 );
|
|
pos.set( 0, 10.2, 0 );
|
|
quat.set( 0, 0, 0, 1 );
|
|
createObject( bridgeMass, bridgeHalfExtents, pos, quat, createMaterial( 0xB3B865 ) );
|
|
|
|
// Stones
|
|
const stoneMass = 120;
|
|
const stoneHalfExtents = new THREE.Vector3( 1, 2, 0.15 );
|
|
const numStones = 8;
|
|
quat.set( 0, 0, 0, 1 );
|
|
for ( let i = 0; i < numStones; i ++ ) {
|
|
|
|
pos.set( 0, 2, 15 * ( 0.5 - i / ( numStones + 1 ) ) );
|
|
|
|
createObject( stoneMass, stoneHalfExtents, pos, quat, createMaterial( 0xB0B0B0 ) );
|
|
|
|
}
|
|
|
|
// Mountain
|
|
const mountainMass = 860;
|
|
const mountainHalfExtents = new THREE.Vector3( 4, 5, 4 );
|
|
pos.set( 5, mountainHalfExtents.y * 0.5, - 7 );
|
|
quat.set( 0, 0, 0, 1 );
|
|
const mountainPoints = [];
|
|
mountainPoints.push( new THREE.Vector3( mountainHalfExtents.x, - mountainHalfExtents.y, mountainHalfExtents.z ) );
|
|
mountainPoints.push( new THREE.Vector3( - mountainHalfExtents.x, - mountainHalfExtents.y, mountainHalfExtents.z ) );
|
|
mountainPoints.push( new THREE.Vector3( mountainHalfExtents.x, - mountainHalfExtents.y, - mountainHalfExtents.z ) );
|
|
mountainPoints.push( new THREE.Vector3( - mountainHalfExtents.x, - mountainHalfExtents.y, - mountainHalfExtents.z ) );
|
|
mountainPoints.push( new THREE.Vector3( 0, mountainHalfExtents.y, 0 ) );
|
|
const mountain = new THREE.Mesh( new ConvexGeometry( mountainPoints ), createMaterial( 0xB03814 ) );
|
|
mountain.position.copy( pos );
|
|
mountain.quaternion.copy( quat );
|
|
convexBreaker.prepareBreakableObject( mountain, mountainMass, new THREE.Vector3(), new THREE.Vector3(), true );
|
|
createDebrisFromBreakableObject( mountain );
|
|
|
|
}
|
|
|
|
function createParalellepipedWithPhysics( sx, sy, sz, mass, pos, quat, material ) {
|
|
|
|
const object = new THREE.Mesh( new THREE.BoxGeometry( sx, sy, sz, 1, 1, 1 ), material );
|
|
const shape = new Ammo.btBoxShape( new Ammo.btVector3( sx * 0.5, sy * 0.5, sz * 0.5 ) );
|
|
shape.setMargin( margin );
|
|
|
|
createRigidBody( object, shape, mass, pos, quat );
|
|
|
|
return object;
|
|
|
|
}
|
|
|
|
function createDebrisFromBreakableObject( object ) {
|
|
|
|
object.castShadow = true;
|
|
object.receiveShadow = true;
|
|
|
|
const shape = createConvexHullPhysicsShape( object.geometry.attributes.position.array );
|
|
shape.setMargin( margin );
|
|
|
|
const body = createRigidBody( object, shape, object.userData.mass, null, null, object.userData.velocity, object.userData.angularVelocity );
|
|
|
|
// Set pointer back to the three object only in the debris objects
|
|
const btVecUserData = new Ammo.btVector3( 0, 0, 0 );
|
|
btVecUserData.threeObject = object;
|
|
body.setUserPointer( btVecUserData );
|
|
|
|
}
|
|
|
|
function removeDebris( object ) {
|
|
|
|
scene.remove( object );
|
|
|
|
physicsWorld.removeRigidBody( object.userData.physicsBody );
|
|
|
|
}
|
|
|
|
function createConvexHullPhysicsShape( coords ) {
|
|
|
|
const shape = new Ammo.btConvexHullShape();
|
|
|
|
for ( let i = 0, il = coords.length; i < il; i += 3 ) {
|
|
|
|
tempBtVec3_1.setValue( coords[ i ], coords[ i + 1 ], coords[ i + 2 ] );
|
|
const lastOne = ( i >= ( il - 3 ) );
|
|
shape.addPoint( tempBtVec3_1, lastOne );
|
|
|
|
}
|
|
|
|
return shape;
|
|
|
|
}
|
|
|
|
function createRigidBody( object, physicsShape, mass, pos, quat, vel, angVel ) {
|
|
|
|
if ( pos ) {
|
|
|
|
object.position.copy( pos );
|
|
|
|
} else {
|
|
|
|
pos = object.position;
|
|
|
|
}
|
|
|
|
if ( quat ) {
|
|
|
|
object.quaternion.copy( quat );
|
|
|
|
} else {
|
|
|
|
quat = object.quaternion;
|
|
|
|
}
|
|
|
|
const transform = new Ammo.btTransform();
|
|
transform.setIdentity();
|
|
transform.setOrigin( new Ammo.btVector3( pos.x, pos.y, pos.z ) );
|
|
transform.setRotation( new Ammo.btQuaternion( quat.x, quat.y, quat.z, quat.w ) );
|
|
const motionState = new Ammo.btDefaultMotionState( transform );
|
|
|
|
const localInertia = new Ammo.btVector3( 0, 0, 0 );
|
|
physicsShape.calculateLocalInertia( mass, localInertia );
|
|
|
|
const rbInfo = new Ammo.btRigidBodyConstructionInfo( mass, motionState, physicsShape, localInertia );
|
|
const body = new Ammo.btRigidBody( rbInfo );
|
|
|
|
body.setFriction( 0.5 );
|
|
|
|
if ( vel ) {
|
|
|
|
body.setLinearVelocity( new Ammo.btVector3( vel.x, vel.y, vel.z ) );
|
|
|
|
}
|
|
|
|
if ( angVel ) {
|
|
|
|
body.setAngularVelocity( new Ammo.btVector3( angVel.x, angVel.y, angVel.z ) );
|
|
|
|
}
|
|
|
|
object.userData.physicsBody = body;
|
|
object.userData.collided = false;
|
|
|
|
scene.add( object );
|
|
|
|
if ( mass > 0 ) {
|
|
|
|
rigidBodies.push( object );
|
|
|
|
// Disable deactivation
|
|
body.setActivationState( 4 );
|
|
|
|
}
|
|
|
|
physicsWorld.addRigidBody( body );
|
|
|
|
return body;
|
|
|
|
}
|
|
|
|
function createRandomColor() {
|
|
|
|
return Math.floor( Math.random() * ( 1 << 24 ) );
|
|
|
|
}
|
|
|
|
function createMaterial( color ) {
|
|
|
|
color = color || createRandomColor();
|
|
return new THREE.MeshPhongMaterial( { color: color } );
|
|
|
|
}
|
|
|
|
function initInput() {
|
|
|
|
window.addEventListener( 'pointerdown', function ( event ) {
|
|
|
|
mouseCoords.set(
|
|
( event.clientX / window.innerWidth ) * 2 - 1,
|
|
- ( event.clientY / window.innerHeight ) * 2 + 1
|
|
);
|
|
|
|
raycaster.setFromCamera( mouseCoords, camera );
|
|
|
|
// Creates a ball and throws it
|
|
const ballMass = 35;
|
|
const ballRadius = 0.4;
|
|
|
|
const ball = new THREE.Mesh( new THREE.SphereGeometry( ballRadius, 14, 10 ), ballMaterial );
|
|
ball.castShadow = true;
|
|
ball.receiveShadow = true;
|
|
const ballShape = new Ammo.btSphereShape( ballRadius );
|
|
ballShape.setMargin( margin );
|
|
pos.copy( raycaster.ray.direction );
|
|
pos.add( raycaster.ray.origin );
|
|
quat.set( 0, 0, 0, 1 );
|
|
const ballBody = createRigidBody( ball, ballShape, ballMass, pos, quat );
|
|
|
|
pos.copy( raycaster.ray.direction );
|
|
pos.multiplyScalar( 24 );
|
|
ballBody.setLinearVelocity( new Ammo.btVector3( pos.x, pos.y, pos.z ) );
|
|
|
|
} );
|
|
|
|
}
|
|
|
|
function onWindowResize() {
|
|
|
|
camera.aspect = window.innerWidth / window.innerHeight;
|
|
camera.updateProjectionMatrix();
|
|
|
|
renderer.setSize( window.innerWidth, window.innerHeight );
|
|
|
|
}
|
|
|
|
function animate() {
|
|
|
|
requestAnimationFrame( animate );
|
|
|
|
render();
|
|
stats.update();
|
|
|
|
}
|
|
|
|
function render() {
|
|
|
|
const deltaTime = clock.getDelta();
|
|
|
|
updatePhysics( deltaTime );
|
|
|
|
renderer.render( scene, camera );
|
|
|
|
}
|
|
|
|
function updatePhysics( deltaTime ) {
|
|
|
|
// Step world
|
|
physicsWorld.stepSimulation( deltaTime, 10 );
|
|
|
|
// Update rigid bodies
|
|
for ( let i = 0, il = rigidBodies.length; i < il; i ++ ) {
|
|
|
|
const objThree = rigidBodies[ i ];
|
|
const objPhys = objThree.userData.physicsBody;
|
|
const ms = objPhys.getMotionState();
|
|
|
|
if ( ms ) {
|
|
|
|
ms.getWorldTransform( transformAux1 );
|
|
const p = transformAux1.getOrigin();
|
|
const q = transformAux1.getRotation();
|
|
objThree.position.set( p.x(), p.y(), p.z() );
|
|
objThree.quaternion.set( q.x(), q.y(), q.z(), q.w() );
|
|
|
|
objThree.userData.collided = false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for ( let i = 0, il = dispatcher.getNumManifolds(); i < il; i ++ ) {
|
|
|
|
const contactManifold = dispatcher.getManifoldByIndexInternal( i );
|
|
const rb0 = Ammo.castObject( contactManifold.getBody0(), Ammo.btRigidBody );
|
|
const rb1 = Ammo.castObject( contactManifold.getBody1(), Ammo.btRigidBody );
|
|
|
|
const threeObject0 = Ammo.castObject( rb0.getUserPointer(), Ammo.btVector3 ).threeObject;
|
|
const threeObject1 = Ammo.castObject( rb1.getUserPointer(), Ammo.btVector3 ).threeObject;
|
|
|
|
if ( ! threeObject0 && ! threeObject1 ) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
const userData0 = threeObject0 ? threeObject0.userData : null;
|
|
const userData1 = threeObject1 ? threeObject1.userData : null;
|
|
|
|
const breakable0 = userData0 ? userData0.breakable : false;
|
|
const breakable1 = userData1 ? userData1.breakable : false;
|
|
|
|
const collided0 = userData0 ? userData0.collided : false;
|
|
const collided1 = userData1 ? userData1.collided : false;
|
|
|
|
if ( ( ! breakable0 && ! breakable1 ) || ( collided0 && collided1 ) ) {
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
let contact = false;
|
|
let maxImpulse = 0;
|
|
for ( let j = 0, jl = contactManifold.getNumContacts(); j < jl; j ++ ) {
|
|
|
|
const contactPoint = contactManifold.getContactPoint( j );
|
|
|
|
if ( contactPoint.getDistance() < 0 ) {
|
|
|
|
contact = true;
|
|
const impulse = contactPoint.getAppliedImpulse();
|
|
|
|
if ( impulse > maxImpulse ) {
|
|
|
|
maxImpulse = impulse;
|
|
const pos = contactPoint.get_m_positionWorldOnB();
|
|
const normal = contactPoint.get_m_normalWorldOnB();
|
|
impactPoint.set( pos.x(), pos.y(), pos.z() );
|
|
impactNormal.set( normal.x(), normal.y(), normal.z() );
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
// If no point has contact, abort
|
|
if ( ! contact ) continue;
|
|
|
|
// Subdivision
|
|
|
|
const fractureImpulse = 250;
|
|
|
|
if ( breakable0 && ! collided0 && maxImpulse > fractureImpulse ) {
|
|
|
|
const debris = convexBreaker.subdivideByImpact( threeObject0, impactPoint, impactNormal, 1, 2, 1.5 );
|
|
|
|
const numObjects = debris.length;
|
|
for ( let j = 0; j < numObjects; j ++ ) {
|
|
|
|
const vel = rb0.getLinearVelocity();
|
|
const angVel = rb0.getAngularVelocity();
|
|
const fragment = debris[ j ];
|
|
fragment.userData.velocity.set( vel.x(), vel.y(), vel.z() );
|
|
fragment.userData.angularVelocity.set( angVel.x(), angVel.y(), angVel.z() );
|
|
|
|
createDebrisFromBreakableObject( fragment );
|
|
|
|
}
|
|
|
|
objectsToRemove[ numObjectsToRemove ++ ] = threeObject0;
|
|
userData0.collided = true;
|
|
|
|
}
|
|
|
|
if ( breakable1 && ! collided1 && maxImpulse > fractureImpulse ) {
|
|
|
|
const debris = convexBreaker.subdivideByImpact( threeObject1, impactPoint, impactNormal, 1, 2, 1.5 );
|
|
|
|
const numObjects = debris.length;
|
|
for ( let j = 0; j < numObjects; j ++ ) {
|
|
|
|
const vel = rb1.getLinearVelocity();
|
|
const angVel = rb1.getAngularVelocity();
|
|
const fragment = debris[ j ];
|
|
fragment.userData.velocity.set( vel.x(), vel.y(), vel.z() );
|
|
fragment.userData.angularVelocity.set( angVel.x(), angVel.y(), angVel.z() );
|
|
|
|
createDebrisFromBreakableObject( fragment );
|
|
|
|
}
|
|
|
|
objectsToRemove[ numObjectsToRemove ++ ] = threeObject1;
|
|
userData1.collided = true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
for ( let i = 0; i < numObjectsToRemove; i ++ ) {
|
|
|
|
removeDebris( objectsToRemove[ i ] );
|
|
|
|
}
|
|
|
|
numObjectsToRemove = 0;
|
|
|
|
}
|
|
|
|
</script>
|
|
|
|
</body>
|
|
</html>
|
|
|