mirror of
https://github.com/Doodle3D/Doodle3D-Slicer.git
synced 2024-11-30 01:14:57 +01:00
257 lines
5.8 KiB
HTML
257 lines
5.8 KiB
HTML
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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 - lines - indexed</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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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; width: 100%;
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padding: 5px;
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}
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a {
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color: #0080ff;
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}
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</style>
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</head>
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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 - buffergeometry - lines - indexed</div>
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<script src="../build/three.min.js"></script>
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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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<script>
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if ( ! Detector.webgl ) Detector.addGetWebGLMessage();
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var container, stats;
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var camera, scene, renderer;
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var mesh, parent_node;
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init();
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animate();
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function init() {
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container = document.getElementById( 'container' );
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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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scene = new THREE.Scene();
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var geometry = new THREE.BufferGeometry();
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var material = new THREE.LineBasicMaterial({ vertexColors: THREE.VertexColors });
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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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var iteration_count = 4;
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var rangle = 60 * Math.PI / 180.0;
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function add_vertex(v) {
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if (next_positions_index == 0xffff) throw new Error("Too many points");
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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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// simple Koch curve
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function snowflake_iteration(p0, p4, depth) {
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if (--depth < 0) {
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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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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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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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var p3 = p0.clone().add(v_tier).add(v_tier);
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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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function snowflake(points, loop, x_offset) {
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for (var iteration = 0; iteration != iteration_count; ++iteration) {
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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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if (loop) snowflake_iteration(points[points.length-1], points[0], iteration);
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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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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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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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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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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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geometry.addAttribute( 'index', new THREE.BufferAttribute( new Uint16Array( indices_array ), 1 ) );
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geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( positions ), 3 ) );
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geometry.addAttribute( 'color', new THREE.BufferAttribute( new Float32Array( colors ), 3 ) );
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geometry.computeBoundingSphere();
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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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parent_node = new THREE.Object3D();
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parent_node.add(mesh);
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scene.add( parent_node );
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renderer = new THREE.WebGLRenderer( { antialias: false } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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renderer.gammaInput = true;
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renderer.gammaOutput = true;
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container.appendChild( renderer.domElement );
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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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window.addEventListener( 'resize', onWindowResize, false );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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var time = Date.now() * 0.001;
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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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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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