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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 - buffergeometry</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: #cccccc;
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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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+
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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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+
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+ #info {
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+ position: absolute;
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+ top: 0px; width: 100%;
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+ padding: 5px;
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+ }
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+
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+ a {
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+
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+ color: #0080ff;
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+ }
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+
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+ </style>
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+ </head>
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+ <body>
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+
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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 - buffergeometry</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 container, stats;
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+
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+ var camera, scene, renderer;
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+
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+ var mesh, parent_node;
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+
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+ init();
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+ animate();
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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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+ camera = new THREE.PerspectiveCamera( 27, window.innerWidth / window.innerHeight, 1, 10000 );
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+ camera.position.z = 9000;
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+
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+ scene = new THREE.Scene();
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+
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+ var geometry = new THREE.BufferGeometry();
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+ var material = new THREE.LineBasicMaterial({ vertexColors: true });
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+
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+ var positions = [];
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+ var next_positions_index = 0;
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+ var colors = [];
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+ var indices_array = [];
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+
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+ // --------------------------------
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+ var iteration_count = 4;
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+ var rangle = 60 * Math.PI / 180.0;
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+
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+ function add_vertex(v) {
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+
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+ if (next_positions_index == 0xffff) throw new Error("Too many points");
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+
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+ positions.push(v.x, v.y, v.z);
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+ colors.push(Math.random()*0.5+0.5, Math.random()*0.5+0.5, 1);
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+ return next_positions_index++;
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+ }
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+
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+ // simple Koch curve
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+ function snowflake_iteration(p0, p4, depth) {
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+
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+ if (--depth < 0) {
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+
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+ var i = next_positions_index-1; // p0 already there
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+ add_vertex(p4);
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+ indices_array.push(i, i+1);
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+ return;
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+ }
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+
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+ var v = p4.clone().sub(p0);
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+ var v_tier = v.clone().multiplyScalar(1.0/3.0);
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+ var p1 = p0.clone().add(v_tier);
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+
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+ var angle = Math.atan2(v.y, v.x) + rangle;
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+ var length = v_tier.length();
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+ var p2 = p1.clone();
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+ p2.x += Math.cos(angle) * length;
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+ p2.y += Math.sin(angle) * length;
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+
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+ var p3 = p0.clone().add(v_tier).add(v_tier);
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+
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+ snowflake_iteration(p0, p1, depth);
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+ snowflake_iteration(p1, p2, depth);
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+ snowflake_iteration(p2, p3, depth);
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+ snowflake_iteration(p3, p4, depth);
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+ }
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+
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+ function snowflake(points, loop, x_offset) {
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+
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+ for (var iteration = 0; iteration != iteration_count; ++iteration) {
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+
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+ add_vertex(points[0]);
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+ for (var p_index=0, p_count=points.length-1; p_index != p_count; ++p_index) {
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+ snowflake_iteration(points[p_index], points[p_index+1], iteration);
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+ }
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+
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+ if (loop) snowflake_iteration(points[points.length-1], points[0], iteration);
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+
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+ // translate input curve for next iteration
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+ for (var p_index=0, p_count=points.length; p_index != p_count; ++p_index) {
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+ points[p_index].x += x_offset;
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+ }
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+
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+ }
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+ }
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+
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+ var y = 0;
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+ snowflake
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+ (
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+ [
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+ new THREE.Vector3(0, y+0, 0),
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+ new THREE.Vector3(500, y+0, 0)
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+ ],
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+ false, 600
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+ );
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+
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+ y += 600;
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+ snowflake
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+ (
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+ [
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+ new THREE.Vector3(0, y+0, 0),
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+ new THREE.Vector3(250, y+400, 0),
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+ new THREE.Vector3(500, y+0, 0)
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+ ],
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+ true, 600
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+ );
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+
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+ y += 600;
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+ snowflake
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+ (
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+ [
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+ new THREE.Vector3(0, y+0, 0),
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+ new THREE.Vector3(500, y, 0),
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+ new THREE.Vector3(500, y+500, 0),
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+ new THREE.Vector3(0, y+500, 0),
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+ ],
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+ true, 600
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+ );
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+
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+ y += 1000;
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+ snowflake
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+ (
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+ [
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+ new THREE.Vector3(250, y+0, 0),
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+ new THREE.Vector3(500, y+0, 0),
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+ new THREE.Vector3(250, y+0, 0),
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+ new THREE.Vector3(250, y+250, 0),
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+ new THREE.Vector3(250, y+0, 0),
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+ new THREE.Vector3(0, y, 0),
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+ new THREE.Vector3(250, y+0, 0),
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+ new THREE.Vector3(250, y-250, 0),
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+ new THREE.Vector3(250, y+0, 0),
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+ ],
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+ false, 600
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+ );
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+ // --------------------------------
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+
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+ geometry.addAttribute( 'position', Float32Array, positions.length, 3 );
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+ geometry.attributes.position.array = new Float32Array(positions);
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+
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+ geometry.addAttribute( 'color', Float32Array, colors.length, 3 );
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+ geometry.attributes.color.array = new Float32Array(colors);
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+
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+ geometry.addAttribute( 'index', Uint16Array, indices_array.length, 1 );
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+ geometry.attributes.index.array = new Uint16Array(indices_array);
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+ geometry.offsets = [ {start:0, index:0, count:indices_array.length} ];
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+
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+ geometry.computeBoundingSphere();
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+
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+ mesh = new THREE.Line( geometry, material, THREE.LinePieces);
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+ mesh.position.x -= 1200;
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+ mesh.position.y -= 1200;
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+
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+ parent_node = new THREE.Object3D();
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+ parent_node.add(mesh);
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+
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+ scene.add( parent_node );
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+
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+ renderer = new THREE.WebGLRenderer( { antialias: false } );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ renderer.gammaInput = true;
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+ renderer.gammaOutput = true;
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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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+ 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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+
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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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+ //
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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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+ function render() {
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+
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+ var time = Date.now() * 0.001;
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+
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+ //mesh.rotation.x = time * 0.25;
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+ //mesh.rotation.y = time * 0.5;
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+ parent_node.rotation.z = time * 0.5;
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+
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+ renderer.render( scene, camera );
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+
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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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+</html>
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Vivien Miniussi