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239 lines
6.6 KiB
239 lines
6.6 KiB
2 years ago
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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 - lines - colors</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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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - color lines<br/>
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<a href="http://en.wikipedia.org/wiki/Hilbert_curve">Hilbert curve</a> thanks to <a href="https://openprocessing.org/user/5654">Thomas Diewald</a>
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import * as GeometryUtils from 'three/addons/utils/GeometryUtils.js';
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let mouseX = 0, mouseY = 0;
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let windowHalfX = window.innerWidth / 2;
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let windowHalfY = window.innerHeight / 2;
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let camera, scene, renderer;
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init();
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animate();
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function init() {
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camera = new THREE.PerspectiveCamera( 33, window.innerWidth / window.innerHeight, 1, 10000 );
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camera.position.z = 1000;
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scene = new THREE.Scene();
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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//
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const hilbertPoints = GeometryUtils.hilbert3D( new THREE.Vector3( 0, 0, 0 ), 200.0, 1, 0, 1, 2, 3, 4, 5, 6, 7 );
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const geometry1 = new THREE.BufferGeometry();
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const geometry2 = new THREE.BufferGeometry();
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const geometry3 = new THREE.BufferGeometry();
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const subdivisions = 6;
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let vertices = [];
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let colors1 = [];
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let colors2 = [];
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let colors3 = [];
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const point = new THREE.Vector3();
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const color = new THREE.Color();
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const spline = new THREE.CatmullRomCurve3( hilbertPoints );
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for ( let i = 0; i < hilbertPoints.length * subdivisions; i ++ ) {
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const t = i / ( hilbertPoints.length * subdivisions );
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spline.getPoint( t, point );
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vertices.push( point.x, point.y, point.z );
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color.setHSL( 0.6, 1.0, Math.max( 0, - point.x / 200 ) + 0.5 );
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colors1.push( color.r, color.g, color.b );
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color.setHSL( 0.9, 1.0, Math.max( 0, - point.y / 200 ) + 0.5 );
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colors2.push( color.r, color.g, color.b );
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color.setHSL( i / ( hilbertPoints.length * subdivisions ), 1.0, 0.5 );
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colors3.push( color.r, color.g, color.b );
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}
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geometry1.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry2.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry3.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry1.setAttribute( 'color', new THREE.Float32BufferAttribute( colors1, 3 ) );
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geometry2.setAttribute( 'color', new THREE.Float32BufferAttribute( colors2, 3 ) );
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geometry3.setAttribute( 'color', new THREE.Float32BufferAttribute( colors3, 3 ) );
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//
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const geometry4 = new THREE.BufferGeometry();
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const geometry5 = new THREE.BufferGeometry();
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const geometry6 = new THREE.BufferGeometry();
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vertices = [];
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colors1 = [];
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colors2 = [];
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colors3 = [];
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for ( let i = 0; i < hilbertPoints.length; i ++ ) {
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const point = hilbertPoints[ i ];
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vertices.push( point.x, point.y, point.z );
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color.setHSL( 0.6, 1.0, Math.max( 0, ( 200 - hilbertPoints[ i ].x ) / 400 ) * 0.5 + 0.5 );
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colors1.push( color.r, color.g, color.b );
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color.setHSL( 0.3, 1.0, Math.max( 0, ( 200 + hilbertPoints[ i ].x ) / 400 ) * 0.5 );
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colors2.push( color.r, color.g, color.b );
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color.setHSL( i / hilbertPoints.length, 1.0, 0.5 );
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colors3.push( color.r, color.g, color.b );
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}
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geometry4.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry5.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry6.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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geometry4.setAttribute( 'color', new THREE.Float32BufferAttribute( colors1, 3 ) );
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geometry5.setAttribute( 'color', new THREE.Float32BufferAttribute( colors2, 3 ) );
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geometry6.setAttribute( 'color', new THREE.Float32BufferAttribute( colors3, 3 ) );
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// Create lines and add to scene
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var material = new THREE.LineBasicMaterial( { color: 0xffffff, vertexColors: true } );
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let line, p;
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const scale = 0.3, d = 225;
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const parameters = [
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[ material, scale * 1.5, [ - d, - d / 2, 0 ], geometry1 ],
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[ material, scale * 1.5, [ 0, - d / 2, 0 ], geometry2 ],
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[ material, scale * 1.5, [ d, - d / 2, 0 ], geometry3 ],
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[ material, scale * 1.5, [ - d, d / 2, 0 ], geometry4 ],
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[ material, scale * 1.5, [ 0, d / 2, 0 ], geometry5 ],
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[ material, scale * 1.5, [ d, d / 2, 0 ], geometry6 ],
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];
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for ( let i = 0; i < parameters.length; i ++ ) {
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p = parameters[ i ];
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line = new THREE.Line( p[ 3 ], p[ 0 ] );
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line.scale.x = line.scale.y = line.scale.z = p[ 1 ];
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line.position.x = p[ 2 ][ 0 ];
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line.position.y = p[ 2 ][ 1 ];
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line.position.z = p[ 2 ][ 2 ];
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scene.add( line );
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}
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//
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document.body.style.touchAction = 'none';
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document.body.addEventListener( 'pointermove', onPointerMove );
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//
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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windowHalfX = window.innerWidth / 2;
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windowHalfY = window.innerHeight / 2;
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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 onPointerMove( event ) {
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if ( event.isPrimary === false ) return;
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mouseX = event.clientX - windowHalfX;
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mouseY = event.clientY - windowHalfY;
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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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}
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function render() {
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camera.position.x += ( mouseX - camera.position.x ) * 0.05;
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camera.position.y += ( - mouseY + 200 - camera.position.y ) * 0.05;
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camera.lookAt( scene.position );
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const time = Date.now() * 0.0005;
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for ( let i = 0; i < scene.children.length; i ++ ) {
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const object = scene.children[ i ];
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if ( object.isLine ) {
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object.rotation.y = time * ( i % 2 ? 1 : - 1 );
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}
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}
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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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