midas
/
threejs-obj-space


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - instancing - raycast</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">
	</head>
	<body>
		<script type="module">

			import * as THREE from '../build/three.module.js';

			import Stats from './jsm/libs/stats.module.js';
			import { GUI } from './jsm/libs/dat.gui.module.js';
			import { OrbitControls } from "./jsm/controls/OrbitControls.js";

			var camera, scene, renderer, stats;

			var mesh;
			var amount = parseInt( window.location.search.substr( 1 ) ) || 10;
			var count = Math.pow( amount, 3 );

			var raycaster = new THREE.Raycaster();
			var mouse = new THREE.Vector2( 1, 1 );

			var rotationMatrix = new THREE.Matrix4().makeRotationY( 0.1 );
			var instanceMatrix = new THREE.Matrix4();
			var matrix = new THREE.Matrix4();

			init();
			animate();

			function init() {

				camera = new THREE.PerspectiveCamera( 60, window.innerWidth / window.innerHeight, 0.1, 100 );
				camera.position.set( amount, amount, amount );
				camera.lookAt( 0, 0, 0 );

				scene = new THREE.Scene();

				var light = new THREE.HemisphereLight( 0xffffff, 0x000088 );
				light.position.set( - 1, 1.5, 1 );
				scene.add( light );

				var light = new THREE.HemisphereLight( 0xffffff, 0x880000, 0.5 );
				light.position.set( - 1, - 1.5, - 1 );
				scene.add( light );

				var geometry = new THREE.SphereBufferGeometry( 0.5 );
				var material = new THREE.MeshPhongMaterial( { flatShading: true } );

				mesh = new THREE.InstancedMesh( geometry, material, count );

				var i = 0;
				var offset = ( amount - 1 ) / 2;

				var transform = new THREE.Object3D();

				for ( var x = 0; x < amount; x ++ ) {

					for ( var y = 0; y < amount; y ++ ) {

						for ( var z = 0; z < amount; z ++ ) {

							transform.position.set( offset - x, offset - y, offset - z );
							transform.updateMatrix();

							mesh.setMatrixAt( i ++, transform.matrix );

						}

					}

				}

				scene.add( mesh );

				//

				var gui = new GUI();
				gui.add( mesh, 'count', 0, count );

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

				new OrbitControls( camera, renderer.domElement );

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

				window.addEventListener( 'resize', onWindowResize, false );
				document.addEventListener( 'mousemove', onMouseMove, false );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );

			}

			function onMouseMove( event ) {

				event.preventDefault();

				mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
				mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

			}

			function animate() {

				requestAnimationFrame( animate );

				render();

			}

			function render() {

				raycaster.setFromCamera( mouse, camera );

				var intersection = raycaster.intersectObject( mesh );

				if ( intersection.length > 0 ) {

					var instanceId = intersection[ 0 ].instanceId;

					mesh.getMatrixAt( instanceId, instanceMatrix );
					matrix.multiplyMatrices( instanceMatrix, rotationMatrix );

					mesh.setMatrixAt( instanceId, matrix );
					mesh.instanceMatrix.needsUpdate = true;

				}

				renderer.render( scene, camera );

				stats.update();

			}

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