webgl_collisions_normal.html


<html> 
 
<head> 
<title>three.js webgl - intersection: ray/mesh readinf normal</title> 
<meta http-equiv="content-type" content="text/html; charset=utf-8"> 
<style type="text/css"> 

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 type="text/javascript" src="../build/Three.js"></script> 
<script type="text/javascript" src="js/RequestAnimationFrame.js"></script>
<script type="text/javascript" src="js/Stats.js"></script>

<script type="text/javascript"> 

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>