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threejs-custom-buffergeometry-cube.html
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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 - Cube</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="module">
import * as THREE from './resources/threejs/r127/build/three.module.js';
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 = 5;
const scene = new THREE.Scene();
{
const color = 0xFFFFFF;
const intensity = 1;
const light = new THREE.DirectionalLight(color, intensity);
light.position.set(-1, 2, 4);
scene.add(light);
}
// NOT A GOOD EXAMPLE OF HOW TO MAKE A CUBE!
// Only trying to make it clear most vertices are unique
const vertices = [
// front
{ pos: [-1, -1, 1], norm: [ 0, 0, 1], uv: [0, 0], },
{ pos: [ 1, -1, 1], norm: [ 0, 0, 1], uv: [1, 0], },
{ pos: [-1, 1, 1], norm: [ 0, 0, 1], uv: [0, 1], },
{ pos: [-1, 1, 1], norm: [ 0, 0, 1], uv: [0, 1], },
{ pos: [ 1, -1, 1], norm: [ 0, 0, 1], uv: [1, 0], },
{ pos: [ 1, 1, 1], norm: [ 0, 0, 1], uv: [1, 1], },
// right
{ pos: [ 1, -1, 1], norm: [ 1, 0, 0], uv: [0, 0], },
{ pos: [ 1, -1, -1], norm: [ 1, 0, 0], uv: [1, 0], },
{ pos: [ 1, 1, 1], norm: [ 1, 0, 0], uv: [0, 1], },
{ pos: [ 1, 1, 1], norm: [ 1, 0, 0], uv: [0, 1], },
{ pos: [ 1, -1, -1], norm: [ 1, 0, 0], uv: [1, 0], },
{ pos: [ 1, 1, -1], norm: [ 1, 0, 0], uv: [1, 1], },
// back
{ pos: [ 1, -1, -1], norm: [ 0, 0, -1], uv: [0, 0], },
{ pos: [-1, -1, -1], norm: [ 0, 0, -1], uv: [1, 0], },
{ pos: [ 1, 1, -1], norm: [ 0, 0, -1], uv: [0, 1], },
{ pos: [ 1, 1, -1], norm: [ 0, 0, -1], uv: [0, 1], },
{ pos: [-1, -1, -1], norm: [ 0, 0, -1], uv: [1, 0], },
{ pos: [-1, 1, -1], norm: [ 0, 0, -1], uv: [1, 1], },
// left
{ pos: [-1, -1, -1], norm: [-1, 0, 0], uv: [0, 0], },
{ pos: [-1, -1, 1], norm: [-1, 0, 0], uv: [1, 0], },
{ pos: [-1, 1, -1], norm: [-1, 0, 0], uv: [0, 1], },
{ pos: [-1, 1, -1], norm: [-1, 0, 0], uv: [0, 1], },
{ pos: [-1, -1, 1], norm: [-1, 0, 0], uv: [1, 0], },
{ pos: [-1, 1, 1], norm: [-1, 0, 0], uv: [1, 1], },
// top
{ pos: [ 1, 1, -1], norm: [ 0, 1, 0], uv: [0, 0], },
{ pos: [-1, 1, -1], norm: [ 0, 1, 0], uv: [1, 0], },
{ pos: [ 1, 1, 1], norm: [ 0, 1, 0], uv: [0, 1], },
{ pos: [ 1, 1, 1], norm: [ 0, 1, 0], uv: [0, 1], },
{ pos: [-1, 1, -1], norm: [ 0, 1, 0], uv: [1, 0], },
{ pos: [-1, 1, 1], norm: [ 0, 1, 0], uv: [1, 1], },
// bottom
{ pos: [ 1, -1, 1], norm: [ 0, -1, 0], uv: [0, 0], },
{ pos: [-1, -1, 1], norm: [ 0, -1, 0], uv: [1, 0], },
{ pos: [ 1, -1, -1], norm: [ 0, -1, 0], uv: [0, 1], },
{ pos: [ 1, -1, -1], norm: [ 0, -1, 0], uv: [0, 1], },
{ pos: [-1, -1, 1], norm: [ 0, -1, 0], uv: [1, 0], },
{ pos: [-1, -1, -1], norm: [ 0, -1, 0], uv: [1, 1], },
];
const positions = [];
const normals = [];
const uvs = [];
for (const vertex of vertices) {
positions.push(...vertex.pos);
normals.push(...vertex.norm);
uvs.push(...vertex.uv);
}
const geometry = new THREE.BufferGeometry();
const positionNumComponents = 3;
const normalNumComponents = 3;
const uvNumComponents = 2;
geometry.setAttribute(
'position',
new THREE.BufferAttribute(new Float32Array(positions), positionNumComponents));
geometry.setAttribute(
'normal',
new THREE.BufferAttribute(new Float32Array(normals), normalNumComponents));
geometry.setAttribute(
'uv',
new THREE.BufferAttribute(new Float32Array(uvs), uvNumComponents));
const loader = new THREE.TextureLoader();
const texture = loader.load('resources/images/star.png');
function makeInstance(geometry, color, x) {
const material = new THREE.MeshPhongMaterial({color, map: texture});
const cube = new THREE.Mesh(geometry, material);
scene.add(cube);
cube.position.x = x;
return cube;
}
const cubes = [
makeInstance(geometry, 0x88FF88, 0),
makeInstance(geometry, 0x8888FF, -4),
makeInstance(geometry, 0xFF8888, 4),
];
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;
}
function render(time) {
time *= 0.001;
if (resizeRendererToDisplaySize(renderer)) {
const canvas = renderer.domElement;
camera.aspect = canvas.clientWidth / canvas.clientHeight;
camera.updateProjectionMatrix();
}
cubes.forEach((cube, ndx) => {
const speed = 1 + ndx * .1;
const rot = time * speed;
cube.rotation.x = rot;
cube.rotation.y = rot;
});
renderer.render(scene, camera);
requestAnimationFrame(render);
}
requestAnimationFrame(render);
}
main();
</script>
</html>