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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 - Copy</title>
<style>
canvas {
width: 100%;
height: 100%;
display: block;
}
*[data-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>
<p>
<span data-diagram="box" class="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 data-diagram="pyramid" class="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",
"three/addons/": "../../examples/jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import {TrackballControls} from 'three/addons/controls/TrackballControls.js';
function main() {
const canvas = document.createElement('canvas');
const renderer = new THREE.WebGLRenderer({canvas, alpha: true});
renderer.setScissorTest(true);
const sceneElements = [];
function addScene(elem, fn) {
const ctx = document.createElement('canvas').getContext('2d');
elem.appendChild(ctx.canvas);
sceneElements.push({elem, ctx, fn});
}
function makeScene(elem) {
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);
scene.add(camera);
const controls = new TrackballControls(camera, elem);
controls.noZoom = true;
controls.noPan = true;
{
const color = 0xFFFFFF;
const intensity = 1;
const light = new THREE.DirectionalLight(color, intensity);
light.position.set(-1, 2, 4);
camera.add(light);
}
return {scene, camera, controls};
}
const sceneInitFunctionsByName = {
'box': (elem) => {
const {scene, camera, controls} = makeScene(elem);
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);
return (time, rect) => {
mesh.rotation.y = time * .1;
camera.aspect = rect.width / rect.height;
camera.updateProjectionMatrix();
controls.handleResize();
controls.update();
renderer.render(scene, camera);
};
},
'pyramid': (elem) => {
const {scene, camera, controls} = makeScene(elem);
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);
return (time, rect) => {
mesh.rotation.y = time * .1;
camera.aspect = rect.width / rect.height;
camera.updateProjectionMatrix();
controls.handleResize();
controls.update();
renderer.render(scene, camera);
};
},
};
document.querySelectorAll('[data-diagram]').forEach((elem) => {
const sceneName = elem.dataset.diagram;
const sceneInitFunction = sceneInitFunctionsByName[sceneName];
const sceneRenderFunction = sceneInitFunction(elem);
addScene(elem, sceneRenderFunction);
});
function render(time) {
time *= 0.001;
for (const {elem, fn, ctx} of sceneElements) {
// get the viewport relative position of this element
const rect = elem.getBoundingClientRect();
const {left, right, top, bottom, width, height} = rect;
const rendererCanvas = renderer.domElement;
const isOffscreen =
bottom < 0 ||
top > window.innerHeight ||
right < 0 ||
left > window.innerWidth;
if (!isOffscreen) {
// make sure the renderer's canvas is big enough
if (rendererCanvas.width < width || rendererCanvas.height < height) {
renderer.setSize(width, height, false);
}
// make sure the canvas for this area is the same size as the area
if (ctx.canvas.width !== width || ctx.canvas.height !== height) {
ctx.canvas.width = width;
ctx.canvas.height = height;
}
renderer.setScissor(0, 0, width, height);
renderer.setViewport(0, 0, width, height);
fn(time, rect);
// copy the rendered scene to this element's canvas
ctx.globalCompositeOperation = 'copy';
ctx.drawImage(
rendererCanvas,
0, rendererCanvas.height - height, width, height, // src rect
0, 0, width, height); // dst rect
}
}
requestAnimationFrame(render);
}
requestAnimationFrame(render);
}
main();
</script>
</html>