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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 - PreserveDrawingBuffer</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,
preserveDrawingBuffer: true,
alpha: true,
});
renderer.autoClearColor = false;
const camera = new THREE.OrthographicCamera(-2, 2, 1, -1, -1, 1);
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);
}
const boxWidth = 1;
const boxHeight = 1;
const boxDepth = 1;
const geometry = new THREE.BoxGeometry(boxWidth, boxHeight, boxDepth);
const base = new THREE.Object3D();
scene.add(base);
base.scale.set(0.1, 0.1, 0.1);
function makeInstance(geometry, color, x, y, z) {
const material = new THREE.MeshPhongMaterial({color});
const cube = new THREE.Mesh(geometry, material);
base.add(cube);
cube.position.set(x, y, z);
return cube;
}
makeInstance(geometry, '#F00', -2, 0, 0);
makeInstance(geometry, '#FF0', 2, 0, 0);
makeInstance(geometry, '#0F0', 0, -2, 0);
makeInstance(geometry, '#0FF', 0, 2, 0);
makeInstance(geometry, '#00F', 0, 0, -2);
makeInstance(geometry, '#F0F', 0, 0, 2);
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 state = { x: 0, y: 0 };
function render(time) {
time *= 0.001; // convert to seconds
if (resizeRendererToDisplaySize(renderer)) {
const canvas = renderer.domElement;
camera.right = canvas.clientWidth / canvas.clientHeight;
camera.left = -camera.right;
camera.updateProjectionMatrix();
}
base.position.set(state.x, state.y, 0);
base.rotation.x = time;
base.rotation.y = time * 1.11;
renderer.render(scene, camera);
requestAnimationFrame(render);
}
requestAnimationFrame(render);
function getCanvasRelativePosition(event) {
const rect = canvas.getBoundingClientRect();
return {
x: (event.clientX - rect.left) * canvas.width / rect.width,
y: (event.clientY - rect.top ) * canvas.height / rect.height,
};
}
const temp = new THREE.Vector3();
function setPosition(e) {
const pos = getCanvasRelativePosition(e);
const x = pos.x / canvas.width * 2 - 1;
const y = pos.y / canvas.height * -2 + 1;
temp.set(x, y, 0).unproject(camera);
state.x = temp.x;
state.y = temp.y;
}
canvas.addEventListener('mousemove', setPosition);
canvas.addEventListener('touchmove', (e) => {
e.preventDefault();
setPosition(e.touches[0]);
}, {passive: false});
}
main();
</script>
</html>