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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 - Multiple Scenes - Generic</title>
<style>
#c {
position: absolute;
left: 0;
top: 0;
width: 100%;
height: 100%;
display: block;
z-index: -1;
}
.diagram {
display: inline-block;
width: 5em;
height: 3em;
}
.left {
float: left;
margin-right: .25em;
}
.right {
float: right;
margin-left: .25em;
}
p {
margin: 1em auto;
max-width: 500px;
font-size: xx-large;
}
</style>
</head>
<body>
<canvas id="c"></canvas>
<p>
<span id="box" class="diagram left"></span>
I love boxes. Presents come in boxes.
When I find a new box I'm always excited to find out what's inside.
</p>
<p>
<span id="pyramid" class="diagram right"></span>
When I was a kid I dreamed of going on an expedition inside a pyramid
and finding a undiscovered tomb full of mummies and treasure.
</p>
</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, alpha: true});
const sceneElements = [];
function addScene(elem, fn) {
sceneElements.push({elem, fn});
}
function makeScene() {
const scene = new THREE.Scene();
const fov = 45;
const aspect = 2; // the canvas default
const near = 0.1;
const far = 5;
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
camera.position.set(0, 1, 2);
camera.lookAt(0, 0, 0);
{
const color = 0xFFFFFF;
const intensity = 1;
const light = new THREE.DirectionalLight(color, intensity);
light.position.set(-1, 2, 4);
scene.add(light);
}
return {scene, camera};
}
{
const elem = document.querySelector('#box');
const {scene, camera} = makeScene();
const geometry = new THREE.BoxGeometry(1, 1, 1);
const material = new THREE.MeshPhongMaterial({color: 'red'});
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
addScene(elem, (time, rect) => {
camera.aspect = rect.width / rect.height;
camera.updateProjectionMatrix();
mesh.rotation.y = time * .1;
renderer.render(scene, camera);
});
}
{
const elem = document.querySelector('#pyramid');
const {scene, camera} = makeScene();
const radius = .8;
const widthSegments = 4;
const heightSegments = 2;
const geometry = new THREE.SphereGeometry(radius, widthSegments, heightSegments);
const material = new THREE.MeshPhongMaterial({
color: 'blue',
flatShading: true,
});
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
addScene(elem, (time, rect) => {
camera.aspect = rect.width / rect.height;
camera.updateProjectionMatrix();
mesh.rotation.y = time * .1;
renderer.render(scene, camera);
});
}
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 clearColor = new THREE.Color('#000');
function render(time) {
time *= 0.001;
resizeRendererToDisplaySize(renderer);
renderer.setScissorTest(false);
renderer.setClearColor(clearColor, 0);
renderer.clear(true, true);
renderer.setScissorTest(true);
const transform = `translateY(${window.scrollY}px)`;
renderer.domElement.style.transform = transform;
for (const {elem, fn} of sceneElements) {
// get the viewport relative position of this element
const rect = elem.getBoundingClientRect();
const {left, right, top, bottom, width, height} = rect;
const isOffscreen =
bottom < 0 ||
top > renderer.domElement.clientHeight ||
right < 0 ||
left > renderer.domElement.clientWidth;
if (!isOffscreen) {
const positiveYUpBottom = renderer.domElement.clientHeight - bottom;
renderer.setScissor(left, positiveYUpBottom, width, height);
renderer.setViewport(left, positiveYUpBottom, width, height);
fn(time, rect);
}
}
requestAnimationFrame(render);
}
requestAnimationFrame(render);
}
main();
</script>
</html>