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+<!doctype html>
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+<html lang="en">
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+ <head>
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+ <title>three.js webgl - interactive - raycasting - pointcloud</title>
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+ <meta charset="utf-8">
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+ <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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+ <style>
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+ body {
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+ color: #ffffff;
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+ background-color: #000000;
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+ margin: 0px;
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+ overflow: hidden;
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+ }
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+ #info {
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+ position: absolute;
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+ top: 0px;
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+ width: 100%;
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+ padding: 5px;
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+ font-family: Monospace;
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+ font-size: 13px;
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+ text-align: center;
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+ font-weight: bold;
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+ }
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+ a {
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+ color: #fff;
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+ }
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+ </style>
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+ </head>
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+
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+ <body>
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+ <div id="container"></div>
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+ <div id="info"><a href="http://threejs.org" target="_blank">three.js</a> webgl - interactive - raycasting - pointcloud </div>
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+
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+ <script src="../build/three.min.js"></script>
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+
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+ <script src="js/Detector.js"></script>
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+ <script src="js/libs/stats.min.js"></script>
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+
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+ <script>
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+
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+ if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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+
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+ var renderer, scene, camera, stats;
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+ var pointclouds;
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+ var projector, raycaster, intersects;
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+ var mouse = { x: 1, y: 1 };
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+ var vector = new THREE.Vector3();
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+ var intersection = null;
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+ var spheres = [];
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+ var spheresIndex = 0;
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+ var clock;
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+
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+ var threshold = 0.1;
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+ var pointSize = 0.01;
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+ var width = 150;
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+ var length = 150;
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+ var rotateY = new THREE.Matrix4().makeRotationY( 0.005 );
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+
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+ init();
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+ animate();
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+
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+ function generatePointCloudGeometry( color, width, length ){
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+
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+ var geometry = new THREE.BufferGeometry();
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+ var numPoints = width*length;
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+
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+ var positions = new Float32Array( numPoints*3 );
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+ var colors = new Float32Array( numPoints*3 );
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+
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+ var k = 0;
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+ for( var i = 0; i < width; i++ ) {
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+ for( var j = 0; j < length; j++ ) {
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+ var u = i / width;
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+ var v = j / length;
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+ var x = u - 0.5;
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+ var y = ( Math.cos( u * Math.PI * 8 ) + Math.sin( v * Math.PI * 8 ) ) / 20;
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+ var z = v - 0.5;
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+
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+ positions[ 3 * k ] = x;
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+ positions[ 3 * k + 1 ] = y;
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+ positions[ 3 * k + 2 ] = z;
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+
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+ var intensity = ( y + 0.1 ) * 5;
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+ colors[ 3 * k ] = color.r * intensity;
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+ colors[ 3 * k + 1 ] = color.g * intensity;
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+ colors[ 3 * k + 2 ] = color.b * intensity;
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+ k++;
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+ }
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+ }
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+
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+ geometry.addAttribute( 'position', new THREE.Float32Attribute( positions, 3 ) );
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+ geometry.addAttribute( 'color', new THREE.Float32Attribute( colors, 3 ) );
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+ geometry.computeBoundingBox();
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+
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+ return geometry;
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+
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+ }
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+
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+ function generatePointcloud( color, width, length ) {
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+
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+ var geometry = generatePointCloudGeometry( color, width, length );
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+
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+ var material = new THREE.PointCloudMaterial( { size: pointSize, vertexColors: true } );
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+ var pointcloud = new THREE.PointCloud( geometry, material );
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+
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+ return pointcloud;
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+
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+ }
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+
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+ function generateIndexedPointcloud( color, width, length ) {
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+
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+ var geometry = generatePointCloudGeometry( color, width, length );
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+ var numPoints = width * length;
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+ var indices = new Uint16Array( numPoints );
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+
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+ var k = 0;
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+ for( var i = 0; i < width; i++ ) {
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+ for( var j = 0; j < length; j++ ) {
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+ indices[ k ] = k;
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+ k++;
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+ }
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+ }
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+
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+ geometry.addAttribute( 'index', new THREE.Uint16Attribute( indices, 1 ) );
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+
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+ var material = new THREE.PointCloudMaterial( { size: pointSize, vertexColors: true } );
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+ var pointcloud = new THREE.PointCloud( geometry, material );
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+
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+ return pointcloud;
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+
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+ }
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+
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+ function generateIndexedWithOffsetPointcloud( color, width, length ){
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+
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+ var geometry = generatePointCloudGeometry( color, width, length );
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+ var numPoints = width * length;
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+ var indices = new Uint16Array( numPoints );
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+
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+ var k = 0;
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+ for( var i = 0; i < width; i++ ){
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+ for( var j = 0; j < length; j++ ) {
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+ indices[ k ] = k;
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+ k++;
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+ }
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+ }
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+
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+ geometry.addAttribute( 'index', new THREE.Uint16Attribute( indices, 1 ) );
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+
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+ var offset = { start: 0, count: indices.length, index: 0 };
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+ geometry.offsets.push( offset );
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+
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+ var material = new THREE.PointCloudMaterial( { size: pointSize, vertexColors: true } );
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+ var pointcloud = new THREE.PointCloud( geometry, material );
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+
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+ return pointcloud;
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+
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+ }
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+
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+ function generateRegularPointcloud( color, width, length ) {
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+
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+ var geometry = new THREE.Geometry();
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+ var numPoints = width * length;
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+
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+ var colors = [];
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+
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+ var k = 0;
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+ for( var i = 0; i < width; i++ ) {
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+ for( var j = 0; j < length; j++ ) {
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+ var u = i / width;
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+ var v = j / length;
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+ var x = u - 0.5;
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+ var y = ( Math.cos( u * Math.PI * 8 ) + Math.sin( v * Math.PI * 8) ) / 20;
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+ var z = v - 0.5;
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+ var v = new THREE.Vector3( x,y,z );
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+
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+ var intensity = ( y + 0.1 ) * 7;
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+ colors[ 3 * k ] = color.r * intensity;
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+ colors[ 3 * k + 1 ] = color.g * intensity;
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+ colors[ 3 * k + 2 ] = color.b * intensity;
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+
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+ geometry.vertices.push( v );
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+ colors[ k ] = ( color.clone().multiplyScalar( intensity ) );
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+
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+ k++;
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+ }
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+ }
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+
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+ geometry.colors = colors;
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+ geometry.computeBoundingBox();
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+
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+ var material = new THREE.PointCloudMaterial( { size: pointSize, vertexColors: true } );
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+ var pointcloud = new THREE.PointCloud( geometry, material );
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+
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+ return pointcloud;
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+
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+ }
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+
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+ function init() {
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+
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+ container = document.getElementById( 'container' );
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+
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+ scene = new THREE.Scene();
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+
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+ clock = new THREE.Clock();
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+
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.applyMatrix( new THREE.Matrix4().makeTranslation( 0,0,20 ) );
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+ camera.applyMatrix( new THREE.Matrix4().makeRotationX( -0.5 ) );
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+
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+ //
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+
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+ pcBuffer = generatePointcloud( new THREE.Color( 1,0,0 ), width, length );
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+ pcBuffer.scale.set( 10,10,10 );
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+ pcBuffer.position.set( -5,0,5 );
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+ scene.add( pcBuffer );
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+
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+ var pcIndexed = generateIndexedPointcloud( new THREE.Color( 0,1,0 ), width, length );
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+ pcIndexed.scale.set( 10,10,10 );
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+ pcIndexed.position.set( 5,0,5 );
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+ scene.add( pcIndexed );
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+
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+ var pcIndexedOffset = generateIndexedWithOffsetPointcloud( new THREE.Color( 0,1,1 ), width, length );
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+ pcIndexedOffset.scale.set( 10,10,10 );
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+ pcIndexedOffset.position.set( 5,0,-5 );
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+ scene.add( pcIndexedOffset );
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+
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+ var pcRegular = generateRegularPointcloud( new THREE.Color( 1,0,1 ), width, length );
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+ pcRegular.scale.set( 10,10,10 );
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+ pcRegular.position.set( -5,0,-5 );
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+ scene.add( pcRegular );
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+
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+ pointclouds = [ pcBuffer, pcIndexed, pcIndexedOffset, pcRegular ];
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+
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+ //
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+
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+ var sphereGeometry = new THREE.SphereGeometry( 0.1, 32, 32 );
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+ var sphereMaterial = new THREE.MeshBasicMaterial( { color: 0xff0000, shading: THREE.FlatShading } );
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+
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+ for ( var i = 0; i < 40; i++ ) {
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+
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+ var sphere = new THREE.Mesh( sphereGeometry, sphereMaterial );
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+ scene.add( sphere );
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+ spheres.push( sphere );
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+
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+ }
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+
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+ //
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+
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+ renderer = new THREE.WebGLRenderer();
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ container.appendChild( renderer.domElement );
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+
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+ //
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+
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+ projector = new THREE.Projector();
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+ raycaster = new THREE.Raycaster();
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+ raycaster.params.PointCloud.threshold = threshold;
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+
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+ //
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+
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+ stats = new Stats();
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+ stats.domElement.style.position = 'absolute';
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+ stats.domElement.style.top = '0px';
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+ container.appendChild( stats.domElement );
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+
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+ //
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+ document.addEventListener( 'mousemove', onDocumentMouseMove, false );
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+
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+ }
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+
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+ function onDocumentMouseMove( event ) {
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+
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+ event.preventDefault();
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+
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+ mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1;
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+ mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ render();
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+ stats.update();
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+
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+ }
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+
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+ var toggle = 0;
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+
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+ function render() {
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+
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+ camera.applyMatrix( rotateY );
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+ camera.updateMatrixWorld( true );
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+
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+ vector.set( mouse.x, mouse.y, 0.1 );
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+
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+ projector.unprojectVector( vector, camera );
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+
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+ raycaster.ray.set( camera.position, vector.sub( camera.position ).normalize() );
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+
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+ var intersections = raycaster.intersectObjects( pointclouds );
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+ intersection = ( intersections.length ) > 0 ? intersections[ 0 ] : null;
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+
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+ if ( toggle > 0.02 && intersection !== null) {
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+
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+ spheres[ spheresIndex ].position.copy( intersection.point );
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+ spheres[ spheresIndex ].scale.set( 1, 1, 1 );
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+ spheresIndex = ( spheresIndex + 1 ) % spheres.length;
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+
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+ toggle = 0;
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+
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+ }
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+
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+ for ( var i = 0; i < spheres.length; i++ ) {
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+
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+ var sphere = spheres[ i ];
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+ sphere.scale.multiplyScalar( 0.98 );
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+ sphere.scale.clampScalar( 0.01, 1 );
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+
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+ }
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+
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+ toggle += clock.getDelta();
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+
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+ renderer.render( scene, camera );
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+ }
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+
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+ </script>
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+
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+ </body>
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+
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+</html>
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mschuetz