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- <!-- Licensed under a BSD license. See license.html for license -->
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
- <title>Three.js - Custom BufferGeometry - Dynamic</title>
- <style>
- html, body {
- height: 100%;
- margin: 0;
- }
- #c {
- width: 100%;
- height: 100%;
- display: block;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const fov = 75;
- const aspect = 2; // the canvas default
- const near = 0.1;
- const far = 100;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.z = 3;
- const scene = new THREE.Scene();
- function addLight( ...pos ) {
- const color = 0xFFFFFF;
- const intensity = 3;
- const light = new THREE.DirectionalLight( color, intensity );
- light.position.set( ...pos );
- scene.add( light );
- }
- addLight( - 1, 2, 4 );
- addLight( 2, - 2, 3 );
- function makeSpherePositions( segmentsAround, segmentsDown ) {
- const numVertices = segmentsAround * segmentsDown * 6;
- const numComponents = 3;
- const positions = new Float32Array( numVertices * numComponents );
- const indices = [];
- const longHelper = new THREE.Object3D();
- const latHelper = new THREE.Object3D();
- const pointHelper = new THREE.Object3D();
- longHelper.add( latHelper );
- latHelper.add( pointHelper );
- pointHelper.position.z = 1;
- const temp = new THREE.Vector3();
- function getPoint( lat, long ) {
- latHelper.rotation.x = lat;
- longHelper.rotation.y = long;
- longHelper.updateMatrixWorld( true );
- return pointHelper.getWorldPosition( temp ).toArray();
- }
- let posNdx = 0;
- let ndx = 0;
- for ( let down = 0; down < segmentsDown; ++ down ) {
- const v0 = down / segmentsDown;
- const v1 = ( down + 1 ) / segmentsDown;
- const lat0 = ( v0 - 0.5 ) * Math.PI;
- const lat1 = ( v1 - 0.5 ) * Math.PI;
- for ( let across = 0; across < segmentsAround; ++ across ) {
- const u0 = across / segmentsAround;
- const u1 = ( across + 1 ) / segmentsAround;
- const long0 = u0 * Math.PI * 2;
- const long1 = u1 * Math.PI * 2;
- positions.set( getPoint( lat0, long0 ), posNdx ); posNdx += numComponents;
- positions.set( getPoint( lat1, long0 ), posNdx ); posNdx += numComponents;
- positions.set( getPoint( lat0, long1 ), posNdx ); posNdx += numComponents;
- positions.set( getPoint( lat1, long1 ), posNdx ); posNdx += numComponents;
- indices.push(
- ndx, ndx + 1, ndx + 2,
- ndx + 2, ndx + 1, ndx + 3,
- );
- ndx += 4;
- }
- }
- return { positions, indices };
- }
- const segmentsAround = 24;
- const segmentsDown = 16;
- const { positions, indices } = makeSpherePositions( segmentsAround, segmentsDown );
- const normals = positions.slice();
- const geometry = new THREE.BufferGeometry();
- const positionNumComponents = 3;
- const normalNumComponents = 3;
- const positionAttribute = new THREE.BufferAttribute( positions, positionNumComponents );
- positionAttribute.setUsage( THREE.DynamicDrawUsage );
- geometry.setAttribute(
- 'position',
- positionAttribute );
- geometry.setAttribute(
- 'normal',
- new THREE.BufferAttribute( normals, normalNumComponents ) );
- geometry.setIndex( indices );
- function makeInstance( geometry, color, x ) {
- const material = new THREE.MeshPhongMaterial( {
- color,
- side: THREE.DoubleSide,
- shininess: 100,
- } );
- const cube = new THREE.Mesh( geometry, material );
- scene.add( cube );
- cube.position.x = x;
- return cube;
- }
- const cubes = [
- makeInstance( geometry, 0xFF0000, 0 ),
- ];
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = canvas.clientWidth;
- const height = canvas.clientHeight;
- const needResize = canvas.width !== width || canvas.height !== height;
- if ( needResize ) {
- renderer.setSize( width, height, false );
- }
- return needResize;
- }
- const temp = new THREE.Vector3();
- function render( time ) {
- time *= 0.001;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const canvas = renderer.domElement;
- camera.aspect = canvas.clientWidth / canvas.clientHeight;
- camera.updateProjectionMatrix();
- }
- for ( let i = 0; i < positions.length; i += 3 ) {
- const quad = ( i / 12 | 0 );
- const ringId = quad / segmentsAround | 0;
- const ringQuadId = quad % segmentsAround;
- const ringU = ringQuadId / segmentsAround;
- const angle = ringU * Math.PI * 2;
- temp.fromArray( normals, i );
- temp.multiplyScalar( THREE.MathUtils.lerp( 1, 1.4, Math.sin( time + ringId + angle ) * .5 + .5 ) );
- temp.toArray( positions, i );
- }
- positionAttribute.needsUpdate = true;
- cubes.forEach( ( cube, ndx ) => {
- const speed = - 0.2 + ndx * .1;
- const rot = time * speed;
- cube.rotation.y = rot;
- } );
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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