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tips-preservedrawingbuffer.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 - PreserveDrawingBuffer</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="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,
antialias: 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 = 3;
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>