webgl_collisions_normal.html

<!doctype html>
<html lang="en">
	<head> 
		<title>three.js webgl - intersection: ray/mesh readinf normal</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;
			}
			 
			#oldie { background-color: #ddd !important }

			#info {
				position: absolute;
				top: 30px; left: 10px; width: 800px;
				color: #000000;
				padding: 5px;
				font-family: Monospace;
				font-size: 13px;
				text-align: left;
				z-index:100;
			}

			#options {
				position: absolute;
				top: 10px; left: 10px; width: 800px;
				color: #000000;
				padding: 5px;
				font-family: Monospace;
				font-size: 13px;
				text-align: left;
				z-index:100;
			}
		</style>
		 
		<script src="../build/Three.js"></script> 
		<script src="js/RequestAnimationFrame.js"></script>
		<script src="js/Stats.js"></script>

		<script> 

			var camera, scene, projector, renderer,
			info, mouse = { x: 0, y: 0 }, sun, loader, stats, line;

			var meshes = [];

			var theta = 0;
			var camdist = 500;

			var totalFaces = 0, totalColliders = 0;

			function init() {

				container = document.createElement( 'div' );
				document.body.appendChild( container );
	
				info = document.getElementById("info");
	
				camera = new THREE.Camera( 40, window.innerWidth / window.innerHeight, 1, 10000 );
				camera.position.z = camdist;
	
				loader = new THREE.JSONLoader(  );

				scene = new THREE.Scene();

				projector = new THREE.Projector();

				renderer = new THREE.WebGLRenderer();
				renderer.setSize( window.innerWidth, window.innerHeight );
				container.appendChild( renderer.domElement );
	
				var ambientLight = new THREE.AmbientLight( 0x606060 );
				scene.add( ambientLight );

				sun = new THREE.DirectionalLight( 0xffffff );
				sun.position = camera.position.clone();
				scene.add( sun );
	
				loadCube();
	
				var lineMat = new THREE.LineBasicMaterial( { color: 0xff0000, opacity: 1, linewidth: 3 } );
	
				var geom = new THREE.Geometry();
				geom.vertices.push( new THREE.Vertex( new THREE.Vector3(-100, 0, 0) ) );
				geom.vertices.push( new THREE.Vertex( new THREE.Vector3( 100, 0, 0) ) );
	
				line = new THREE.Line(geom, lineMat);
				scene.add( line );

				stats = new Stats();
				stats.domElement.style.position = 'absolute';
				stats.domElement.style.top = '0px';
				container.appendChild( stats.domElement );

				container.onmousemove = onDocumentMouseMove;
				animate();

			}

			function loadCube(p) {

				var onGeometry = function( geometry ) {	
	
					var sx = 300;
					var sy = 240;
					var sz = 300;
		
					addCube( new THREE.Vector3(	0,	0,	0), geometry );
		
				};

	
				loader.load( { model: "obj/suzanne/suzanneHi.js", callback: onGeometry } );
			}

			function addCube( p, g) {

				totalFaces += g.faces.length;
				totalColliders++;

				var mesh = new THREE.Mesh( g, new THREE.MeshLambertMaterial( { color: 0x003300 } ) );
				mesh.position = p;

				scene.add( mesh );
				var mc = THREE.CollisionUtils.MeshColliderWBox(mesh);
				THREE.Collisions.colliders.push( mc );
				meshes.push( mesh );

			};

			function onDocumentMouseMove( event ) {

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

			};


			function animate() {

				requestAnimationFrame( animate );

				var vector = new THREE.Vector3( mouse.x, mouse.y, 0.5 );
				projector.unprojectVector( vector, camera );

				var ray = new THREE.Ray( camera.position, vector.subSelf( camera.position ).normalize() );
	
				if ( meshes.length == 0 ) return;
	
				var i, l = meshes.length;
	
				for ( i = 0; i < l; i++ ) {
					meshes[ i ].materials[ 0 ].color.setHex( 0x003300 );
				}
	
				info.innerHTML = "";


				var c = THREE.Collisions.rayCastNearest( ray );
	
				if( c ) {
	
					info.innerHTML += "Found @ normal " + vts(c.normal);
		
					var poi = ray.origin.clone().addSelf( ray.direction.clone().multiplyScalar(c.distance) );
					line.geometry.vertices[0].position = poi;
					line.geometry.vertices[1].position = poi.clone().addSelf(c.normal.multiplyScalar(100));
					line.geometry.__dirtyVertices = true; 
					line.geometry.__dirtyElements = true;
		
					c.mesh.materials[ 0 ].color.setHex( 0xbb0000 );

				} else {
	
					info.innerHTML += "No intersection";

				}

				camera.position.x = camdist * Math.cos( theta );
				camera.position.z = camdist * Math.sin( theta );
				camera.position.y = camdist/2 * Math.sin( theta * 2) ;

				sun.position.copy( camera.position );
				sun.position.normalize();

				theta += 0.005;		

				renderer.render( scene, camera );
	
				stats.update();
	
			};

			function vts(v) {

				if(!v) return "undefined<br>";
				else return v.x.toFixed(2) + " , " + v.y.toFixed(2) + " , " + v.z.toFixed(2) + "<br>";

			};

		</script>

	</head> 

	<body onload="init();"> 
		<div id="info"></div>
		<div id="options"></div>
	</body> 

</html>