javascript
/
three.js
镜像来自 https://github.com/tazdij/three.js.git


			
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							<html>

<head>
<title>three.js webgl - intersection: ray with terrain mesh (through box)</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">

var camera, scene, renderer,
info, mouse2d, sun, loader, sphere, ray;

var theta = 0, radius = 250, speed = 0.002, sphereSize = 4;


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.y = 120;
	mouse2d = new THREE.Vector3( 0, 0, 1 );

	loader = new THREE.JSONLoader();

	scene = new THREE.Scene();

	ray = new THREE.Ray();
	ray.origin.y = 10000;
	ray.direction = new THREE.Vector3(0, -1, 0);

	sphere = new THREE.Mesh( new THREE.SphereGeometry( sphereSize, 10, 10 ), new THREE.MeshLambertMaterial( { color: 0xff0000 } ) );
	scene.add(sphere);

	renderer = new THREE.WebGLRenderer();
	renderer.setSize( window.innerWidth, window.innerHeight );
	container.appendChild(renderer.domElement);

	var ambientLight = new THREE.AmbientLight( 0x444444 );
	scene.add( ambientLight );

	sun = new THREE.DirectionalLight( 0xaaaaaa );
	sun.position = new THREE.Vector3(-1,1, -1).normalize();
	scene.add( sun );

	loadCube();


	container.onmousemove = onDocumentMouseMove;
	animate();
}

function loadCube(p) {
	var onGeometry = function( geometry ) {
		var mesh = new THREE.Mesh( geometry, new THREE.MeshLambertMaterial( { color: 0xf3e4b8 } ) );
		scene.add( mesh );
		THREE.Collisions.colliders.push( THREE.CollisionUtils.MeshColliderWBox(mesh) );
	};

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

function onDocumentMouseMove( event ) {
	event.preventDefault();
	mouse2d.x = ( event.clientX / window.innerWidth ) * 2 - 1;
	mouse2d.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
	mouse2d.z = 1;
}

function animate() {
	requestAnimationFrame( animate );

	ray.origin.x = radius * Math.cos(theta);
	ray.origin.z = radius * Math.sin(theta);

	var c = THREE.Collisions.rayCastNearest(ray);
	if(c) {
		//info.innerHTML = "Found @ distance " + c.distance;
		sphere.position = ray.origin.clone().subSelf( new THREE.Vector3(0, c.distance - sphereSize/2, 0) );
	} else {
		//info.innerHTML = "No intersection";
	}

	theta += speed;

	camera.target.position.copy( sphere.position );

	renderer.render( scene, camera );
}

function vts(v) {
	if(!v) return "undefined<br>";
	else return v.x + " , " + v.y + " , " + v.z + "<br>";
}

</script>

</head>

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

</html>