javascript
/
three.js
mirror of https://github.com/tazdij/three.js.git


			
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js physics - OimoPhysics instancing</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
		<link type="text/css" rel="stylesheet" href="main.css">
	</head>
	<body>

		<div id="info">
			<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> physics - OimoPhysics instancing
		</div>


		<script type="module">

			import * as THREE from '../build/three.module.js';
			import { OrbitControls } from './jsm/controls/OrbitControls.js';
			import Stats from './jsm/libs/stats.module.js';
			// Or use latest version from NPM `oimophysics`
			import {oimo} from './jsm/libs/OimoPhysics.js';


			const Vec3 = oimo.common.Vec3;
			const World = oimo.dynamics.World;
			const RigidBodyType = oimo.dynamics.rigidbody.RigidBodyType;
			const RigidBodyConfig = oimo.dynamics.rigidbody.RigidBodyConfig;
			const ShapeConfig = oimo.dynamics.rigidbody.ShapeConfig;
			const RigidBody = oimo.dynamics.rigidbody.RigidBody;
			const Shape = oimo.dynamics.rigidbody.Shape;
			const OBoxGeometry = oimo.collision.geometry.BoxGeometry;
			const OSphereGeometry = oimo.collision.geometry.SphereGeometry;


			let camera, scene, renderer, stats;
			let physics, position;
			let world;

			let boxes, spheres;
			let boxesPhys, spheresPhys;

			const dummy = new THREE.Object3D();

			init();

			async function init() {
				world = new World(2, new Vec3(0, -9.8, 0));

				boxesPhys = [];
				spheresPhys = [];

				position = new THREE.Vector3();

				camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( - 1, 1.5, 2 );
				camera.lookAt( 0, 0.5, 0 );

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0x666666 );

				const hemiLight = new THREE.HemisphereLight();
				hemiLight.intensity = 0.35;
				scene.add( hemiLight );

				const dirLight = new THREE.DirectionalLight();
				dirLight.position.set( 5, 5, 5 );
				dirLight.castShadow = true;
				dirLight.shadow.camera.zoom = 2;
				scene.add( dirLight );

				const floor = new THREE.Mesh(
					new THREE.BoxGeometry( 10, 5, 10 ),
					new THREE.ShadowMaterial( { color: 0x111111 } )
				);
				floor.position.y = - 2.5;
				floor.receiveShadow = true;
				floor.userData.physics = addRigidBody(world, vec3FromVector3(floor.position), new OBoxGeometry(new Vec3(10 / 2, 5 / 2, 10 / 2)), true);
				scene.add( floor );

				const material = new THREE.MeshLambertMaterial();

				const matrix = new THREE.Matrix4();
				const color = new THREE.Color();

				// Boxes
				const boxSideSize = 0.1;
				const geometryBox = new THREE.BoxGeometry( boxSideSize, boxSideSize, boxSideSize );
				boxes = new THREE.InstancedMesh( geometryBox, material, 100 );
				boxes.instanceMatrix.setUsage( THREE.DynamicDrawUsage ); // will be updated every frame
				boxes.castShadow = true;
				boxes.receiveShadow = true;
				scene.add( boxes );

				for ( let i = 0; i < boxes.count; i ++ ) {
					position.set(Math.random() - 0.5, Math.random() * 10, Math.random() - 0.5);
					matrix.setPosition( position.x, position.y, position.z );
					boxes.setMatrixAt( i, matrix );
					boxes.setColorAt( i, color.setHex( 0xffffff * Math.random() ) );
					// size of the side of the cube should be 2 times smaller
					boxesPhys.push(addRigidBody(world, vec3FromVector3(position), new OBoxGeometry(new Vec3(boxSideSize / 2, boxSideSize / 2, boxSideSize / 2)), false));
				}


				// Spheres
				const geometrySphere = new THREE.IcosahedronGeometry( 0.075, 3 );
				spheres = new THREE.InstancedMesh( geometrySphere, material, 100 );
				spheres.instanceMatrix.setUsage( THREE.DynamicDrawUsage ); // will be updated every frame
				spheres.castShadow = true;
				spheres.receiveShadow = true;
				scene.add( spheres );

				for ( let i = 0; i < spheres.count; i ++ ) {
					position.set(Math.random() - 0.5, Math.random() * 10, Math.random() - 0.5);
					matrix.setPosition( position.x, position.y, position.z );
					spheres.setMatrixAt( i, matrix );
					spheres.setColorAt( i, color.setHex( 0xffffff * Math.random() ) );
					spheresPhys.push(addRigidBody(world, vec3FromVector3(position), new OSphereGeometry(0.075), false));
				}


				//

				renderer = new THREE.WebGLRenderer( { antialias: true } );
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				renderer.shadowMap.enabled = true;
				renderer.outputEncoding = THREE.sRGBEncoding;
				document.body.appendChild( renderer.domElement );

				stats = new Stats();
				document.body.appendChild( stats.dom );

				//

				const controls = new OrbitControls( camera, renderer.domElement );
				controls.target.y = 0.5;
				controls.update();

				window.addEventListener('resize', onWindowResize);

				animate();

			}

			function onWindowResize() {
				camera.aspect = document.body.clientWidth / document.body.clientHeight;
				camera.updateProjectionMatrix();
				renderer.setSize(document.body.clientWidth, document.body.clientHeight);
			}

			function animate() {

				requestAnimationFrame( animate );

				world.step(1 / 60);

				// updating data of visual objects from physical objects
				// BOXES
				boxesPhys.forEach((elPhys, index) => {
					const posVec3 = elPhys.getPosition();
					dummy.position.set(posVec3.x, posVec3.y, posVec3.z);
					dummy.setRotationFromQuaternion(quaternionFromQuat(elPhys.getOrientation()));
					dummy.updateMatrix();
					boxes.setMatrixAt( index, dummy.matrix );
				});

				let index = Math.floor( Math.random() * boxes.count );
				boxesPhys[index].setPosition( new Vec3(0, Math.random() + 1, 0) );
				boxes.instanceMatrix.needsUpdate = true;


				// SPHERES
				spheresPhys.forEach((elPhys, index) => {
					const posVec3 = elPhys.getPosition();
					dummy.position.set(posVec3.x, posVec3.y, posVec3.z);
					dummy.setRotationFromQuaternion(quaternionFromQuat(elPhys.getOrientation()));
					dummy.updateMatrix();
					spheres.setMatrixAt( index, dummy.matrix );
				});

				index = Math.floor( Math.random() * spheres.count );
				spheresPhys[index].setPosition( new Vec3(0, Math.random() + 1, 0) );
				spheres.instanceMatrix.needsUpdate = true;


				renderer.render( scene, camera );

				stats.update();
			}

			// adding a physical object to the world of physics
			function addRigidBody(w, center, geom, wall) {
				const shapeConfig = new ShapeConfig();
				shapeConfig.geometry = geom;
				const bodyConfig = new RigidBodyConfig();
				bodyConfig.type = wall ? RigidBodyType.STATIC : RigidBodyType.DYNAMIC;
				bodyConfig.position = center;
				let body = new RigidBody(bodyConfig);
				body.addShape(new Shape(shapeConfig));
				w.addRigidBody(body);
				return body;
			}

			// convert threejs Vector3 to oimo Vec3
			function vec3FromVector3(position) {
				return new Vec3(...position.toArray());
			}

			// convert oimo Quat to threejs quaternion
			function quaternionFromQuat(quat) {
				return new THREE.Quaternion(quat.x, quat.y, quat.z, quat.w);
			}

		</script>
	</body>
</html>