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 webgl - octree</title>
		<meta charset="utf-8">
		<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
		<style>
			body {
				font-family: Monospace;
				background-color: #f0f0f0;
				margin: 0px;
				overflow: hidden;
			}
		</style>
	</head>
	<body>

		<script type="text/javascript" src="../build/three.js"></script>
		<script type="text/javascript" src="js/Octree.js"></script>
		<script>

			var camera,
				scene,
				renderer,
				octree,
				geometry = new THREE.BoxBufferGeometry( 50, 50, 50 ),
				material,
				mesh,
				meshes = [],
				meshesSearch = [],
				meshCountMax = 100,
				radius = 500,
				radiusMax = radius * 10,
				radiusMaxHalf = radiusMax * 0.5,
				radiusSearch = 400,
				searchMesh,
				base = new THREE.Color( 0xff00ff ),
				found = new THREE.Color( 0x00ff00 ),
				adding = true,
				rayCaster = new THREE.Raycaster(),
				origin = new THREE.Vector3(),
				direction = new THREE.Vector3();

			init();
			animate();

			function init() {

				// standard three scene, camera, renderer

				scene = new THREE.Scene();
				scene.background = new THREE.Color( 0xf0f0f0 );

				camera = new THREE.PerspectiveCamera( 75, window.innerWidth / window.innerHeight, 1, radius * 100 );
				scene.add( camera );

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

				// create octree

				octree = new THREE.Octree( {
					// when undeferred = true, objects are inserted immediately
					// instead of being deferred until next octree.update() call
					// this may decrease performance as it forces a matrix update
					undeferred: false,
					// set the max depth of tree
					depthMax: Infinity,
					// max number of objects before nodes split or merge
					objectsThreshold: 8,
					// percent between 0 and 1 that nodes will overlap each other
					// helps insert objects that lie over more than one node
					overlapPct: 0.15,
					// pass the scene to visualize the octree
					scene: scene
				} );

				// create object to show search radius and add to scene

				searchMesh = new THREE.Mesh(
					new THREE.SphereBufferGeometry( radiusSearch ),
					new THREE.MeshBasicMaterial( { color: 0x00FF00, transparent: true, opacity: 0.4 } )
				);
				scene.add( searchMesh );

				// info

				var info = document.createElement( 'div' );
				info.style.position = 'absolute';
				info.style.top = '0';
				info.style.width = '100%';
				info.style.textAlign = 'center';
				info.style.padding = '10px';
				info.style.background = '#FFFFFF';
				info.innerHTML = '<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - octree (sparse & dynamic) - by <a href="http://github.com/collinhover/threeoctree" target="_blank" rel="noopener">collinhover</a>';
				document.body.appendChild( info );

			}

			function animate() {

				// note: three.js includes requestAnimationFrame shim
				requestAnimationFrame( animate );

				// modify octree structure by adding/removing objects

				modifyOctree();

				// search octree at random location

				searchOctree();

				// render results

				render();

				// update octree to add deferred objects

				octree.update();

			}

			function modifyOctree() {

				// if is adding objects to octree

				if ( adding === true ) {

					// create new object

					mesh = new THREE.Mesh( geometry, new THREE.MeshBasicMaterial( { color: new THREE.Color( base ) } ) );

					// give new object a random position in radius

					mesh.position.set(
						Math.random() * radiusMax - radiusMaxHalf,
						Math.random() * radiusMax - radiusMaxHalf,
						Math.random() * radiusMax - radiusMaxHalf
					);

					// add new object to octree and scene

					octree.add( mesh );
					scene.add( mesh );

					// store object for later

					meshes.push( mesh );

					// if at max, stop adding

					if ( meshes.length === meshCountMax ) {

						adding = false;

					}

				}
				// else remove objects from octree
				else {

					// get object

					mesh = meshes.shift();

					// remove from scene and octree

					scene.remove( mesh );
					octree.remove( mesh );

					// if no more objects, start adding

					if ( meshes.length === 0 ) {

						adding = true;

					}

				}

				/*

				// octree details to console

				console.log( ' OCTREE: ', octree );
				console.log( ' ... depth ', octree.depth, ' vs depth end?', octree.depth_end() );
				console.log( ' ... num nodes: ', octree.node_count_end() );
				console.log( ' ... total objects: ', octree.object_count_end(), ' vs tree objects length: ', octree.objects.length );

				// print full octree structure to console

				octree.to_console();

				*/

			}

			function searchOctree() {

				var i, il;

				// revert previous search objects to base color

				for ( i = 0, il = meshesSearch.length; i < il; i++ ) {

					meshesSearch[ i ].object.material.color.copy( base );

				}

				// new search position
				searchMesh.position.set(
					Math.random() * radiusMax - radiusMaxHalf,
					Math.random() * radiusMax - radiusMaxHalf,
					Math.random() * radiusMax - radiusMaxHalf
				);

				// search octree from search mesh position with search radius
				// optional third parameter: boolean, if should sort results by object when using faces in octree
				// optional fourth parameter: vector3, direction of search when using ray (assumes radius is distance/far of ray)

				origin.copy( searchMesh.position );
				direction.set( Math.random() * 2 - 1, Math.random() * 2 - 1, Math.random() * 2 - 1 ).normalize();
				rayCaster.set( origin, direction );
				meshesSearch = octree.search( rayCaster.ray.origin, radiusSearch, true, rayCaster.ray.direction );
				rayCaster.intersectOctreeObjects( meshesSearch );

				// set color of all meshes found in search

				for ( i = 0, il = meshesSearch.length; i < il; i++ ) {

					meshesSearch[ i ].object.material.color.copy( found );

				}

			}

			function render() {

				var timer = - Date.now() / 5000;

				camera.position.x = Math.cos( timer ) * 10000;
				camera.position.z = Math.sin( timer ) * 10000;
				camera.lookAt( scene.position );

				renderer.render( scene, camera );

			}

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