You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
200 lines
5.4 KiB
200 lines
5.4 KiB
<!-- 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>
|
|
<!-- Import maps polyfill -->
|
|
<!-- Remove this when import maps will be widely supported -->
|
|
<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
|
|
|
|
<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({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 = 1;
|
|
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>
|
|
|
|
|