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201 lines
5.4 KiB
201 lines
5.4 KiB
2 years ago
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<!-- 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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<!-- 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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}
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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({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 = 1;
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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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