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webgl_interactive_cubes_gpu.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - interactive cubes (gpu)</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;
}
.info {
position: absolute;
background-color: black;
opacity: 0.8;
color: white;
text-align: center;
top: 0px;
width: 100%;
}
.info a {
color: #00ffff;
}
</style>
</head>
<body>
<div class="info">
<a href="http://threejs.org" target="_blank">three.js</a> webgl - gpu picking
</div>
<div id="container"></div>
<script src="../build/three.min.js"></script>
<script src="js/controls/TrackballControls.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
var container, stats;
var camera, controls, scene, renderer;
var pickingData = [], pickingTexture, pickingScene;
var objects = [];
var highlightBox;
var mouse = new THREE.Vector2();
var offset = new THREE.Vector3(10, 10, 10);
init();
animate();
function init() {
container = document.getElementById("container");
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );
camera.position.z = 1000;
controls = new THREE.TrackballControls( camera );
controls.rotateSpeed = 1.0;
controls.zoomSpeed = 1.2;
controls.panSpeed = 0.8;
controls.noZoom = false;
controls.noPan = false;
controls.staticMoving = true;
controls.dynamicDampingFactor = 0.3;
scene = new THREE.Scene();
pickingScene = new THREE.Scene();
pickingTexture = new THREE.WebGLRenderTarget(window.innerWidth, window.innerHeight);
pickingTexture.generateMipmaps = false;
scene.add( new THREE.AmbientLight( 0x555555 ) );
var light = new THREE.SpotLight( 0xffffff, 1.5 );
light.position.set( 0, 500, 2000 );
light.castShadow = true;
light.shadowCameraNear = 200;
light.shadowCameraFar = camera.far;
light.shadowCameraFov = 50;
light.shadowBias = -0.00022;
light.shadowDarkness = 0.5;
light.shadowMapWidth = 1024;
light.shadowMapHeight = 1024;
scene.add( light );
var geometry = new THREE.Geometry(),
pickingGeometry = new THREE.Geometry(),
pickingMaterial = new THREE.MeshBasicMaterial({
vertexColors: THREE.VertexColors
}),
defaultMaterial = new THREE.MeshLambertMaterial({
color: 0xffffff,
shading: THREE.FlatShading,
vertexColors: THREE.VertexColors
});
function applyVertexColors(g, c) {
g.faces.forEach(function(f){
var n = (f instanceof THREE.Face3) ? 3 : 4;
for(var j=0; j<n; j++){
f.vertexColors[j] = c;
}
});
}
for ( var i = 0; i < 5000; i ++ ) {
var position = new THREE.Vector3();
position.x = Math.random() * 10000 - 5000;
position.y = Math.random() * 6000 - 3000;
position.z = Math.random() * 8000 - 4000;
var rotation = new THREE.Vector3();
rotation.x = ( Math.random() * 2 * Math.PI);
rotation.y = ( Math.random() * 2 * Math.PI);
rotation.z = ( Math.random() * 2 * Math.PI);
var scale = new THREE.Vector3();
scale.x = Math.random() * 200 + 100;
scale.y = Math.random() * 200 + 100;
scale.z = Math.random() * 200 + 100;
//give the geom's vertices a random color, to be displayed
var geom = new THREE.CubeGeometry(1, 1, 1);
var color = new THREE.Color(Math.random() * 0xffffff);
applyVertexColors(geom, color);
var cube = new THREE.Mesh(geom);
cube.position.copy(position);
cube.rotation.copy(rotation);
cube.scale.copy(scale);
THREE.GeometryUtils.merge(geometry, cube);
//give the pickingGeom's vertices a color corresponding to the "id"
var pickingGeom = new THREE.CubeGeometry(1, 1, 1);
var pickingColor = new THREE.Color(i);
applyVertexColors(pickingGeom, pickingColor);
var pickingCube = new THREE.Mesh(pickingGeom);
pickingCube.position.copy(position);
pickingCube.rotation.copy(rotation);
pickingCube.scale.copy(scale);
THREE.GeometryUtils.merge(pickingGeometry, pickingCube);
pickingData[i] = {
position: position,
rotation: rotation,
scale: scale
};
}
var drawnObject = new THREE.Mesh(geometry, defaultMaterial);
//drawnObject.castShadow = true;
//drawnObject.receiveShadow = true;
scene.add(drawnObject);
pickingScene.add(new THREE.Mesh(pickingGeometry, pickingMaterial));
highlightBox = new THREE.Mesh(new THREE.CubeGeometry(1, 1, 1), new THREE.MeshLambertMaterial({color: 0xffff00}));
scene.add(highlightBox);
projector = new THREE.Projector();
renderer = new THREE.WebGLRenderer( { antialias: true, clearColor: 0xffffff } );
renderer.sortObjects = false;
renderer.setSize( window.innerWidth, window.innerHeight );
renderer.shadowMapEnabled = true;
renderer.shadowMapSoft = true;
container.appendChild( renderer.domElement );
stats = new Stats();
stats.domElement.style.position = 'absolute';
stats.domElement.style.top = '0px';
container.appendChild( stats.domElement );
renderer.domElement.addEventListener('mousemove', onMouseMove);
}
//
function onMouseMove(e) {
mouse.x = e.clientX;
mouse.y = e.clientY;
}
function animate() {
requestAnimationFrame( animate );
render();
stats.update();
}
function pick() {
//render the picking scene off-screen
var gl = self.renderer.getContext();
renderer.render(pickingScene, camera, pickingTexture);
var pixelBuffer = new Uint8Array(4);
//read the pixel under the mouse from the texture
gl.readPixels(mouse.x, pickingTexture.height - mouse.y, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixelBuffer);
//interpret the pixel as an ID
var id = (pixelBuffer[0] << 16) | (pixelBuffer[1] << 8) | (pixelBuffer[2]);
var data = pickingData[id];
if(data){
//move our highlightBox so that it surrounds the picked object
if(data.position && data.rotation && data.scale){
highlightBox.position.copy(data.position);
highlightBox.rotation.copy(data.rotation);
highlightBox.scale.copy(data.scale).addSelf(offset);
highlightBox.visible = true;
}
} else {
highlightBox.visible = false;
}
}
function render() {
controls.update();
pick();
renderer.render( scene, camera );
}
</script>
</body>
</html>