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