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webgl_clipping.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>three.js webgl - clipping planes</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<link type="text/css" rel="stylesheet" href="main.css">
</head>
<body>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/[email protected]/dist/es-module-shims.js"></script>
<script type="importmap">
{
"imports": {
"three": "../build/three.module.js",
"three/addons/": "./jsm/"
}
}
</script>
<script type="module">
import * as THREE from 'three';
import Stats from 'three/addons/libs/stats.module.js';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
let camera, scene, renderer, startTime, object, stats;
init();
animate();
function init() {
camera = new THREE.PerspectiveCamera( 36, window.innerWidth / window.innerHeight, 0.25, 16 );
camera.position.set( 0, 1.3, 3 );
scene = new THREE.Scene();
// Lights
scene.add( new THREE.AmbientLight( 0x505050 ) );
const spotLight = new THREE.SpotLight( 0xffffff );
spotLight.angle = Math.PI / 5;
spotLight.penumbra = 0.2;
spotLight.position.set( 2, 3, 3 );
spotLight.castShadow = true;
spotLight.shadow.camera.near = 3;
spotLight.shadow.camera.far = 10;
spotLight.shadow.mapSize.width = 1024;
spotLight.shadow.mapSize.height = 1024;
scene.add( spotLight );
const dirLight = new THREE.DirectionalLight( 0x55505a, 1 );
dirLight.position.set( 0, 3, 0 );
dirLight.castShadow = true;
dirLight.shadow.camera.near = 1;
dirLight.shadow.camera.far = 10;
dirLight.shadow.camera.right = 1;
dirLight.shadow.camera.left = - 1;
dirLight.shadow.camera.top = 1;
dirLight.shadow.camera.bottom = - 1;
dirLight.shadow.mapSize.width = 1024;
dirLight.shadow.mapSize.height = 1024;
scene.add( dirLight );
// ***** Clipping planes: *****
const localPlane = new THREE.Plane( new THREE.Vector3( 0, - 1, 0 ), 0.8 );
const globalPlane = new THREE.Plane( new THREE.Vector3( - 1, 0, 0 ), 0.1 );
// Geometry
const material = new THREE.MeshPhongMaterial( {
color: 0x80ee10,
shininess: 100,
side: THREE.DoubleSide,
// ***** Clipping setup (material): *****
clippingPlanes: [ localPlane ],
clipShadows: true
} );
const geometry = new THREE.TorusKnotGeometry( 0.4, 0.08, 95, 20 );
object = new THREE.Mesh( geometry, material );
object.castShadow = true;
scene.add( object );
const ground = new THREE.Mesh(
new THREE.PlaneGeometry( 9, 9, 1, 1 ),
new THREE.MeshPhongMaterial( { color: 0xa0adaf, shininess: 150 } )
);
ground.rotation.x = - Math.PI / 2; // rotates X/Y to X/Z
ground.receiveShadow = true;
scene.add( ground );
// Stats
stats = new Stats();
document.body.appendChild( stats.dom );
// Renderer
renderer = new THREE.WebGLRenderer();
renderer.shadowMap.enabled = true;
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
window.addEventListener( 'resize', onWindowResize );
document.body.appendChild( renderer.domElement );
// ***** Clipping setup (renderer): *****
const globalPlanes = [ globalPlane ],
Empty = Object.freeze( [] );
renderer.clippingPlanes = Empty; // GUI sets it to globalPlanes
renderer.localClippingEnabled = true;
// Controls
const controls = new OrbitControls( camera, renderer.domElement );
controls.target.set( 0, 1, 0 );
controls.update();
// GUI
const gui = new GUI(),
folderLocal = gui.addFolder( 'Local Clipping' ),
propsLocal = {
get 'Enabled'() {
return renderer.localClippingEnabled;
},
set 'Enabled'( v ) {
renderer.localClippingEnabled = v;
},
get 'Shadows'() {
return material.clipShadows;
},
set 'Shadows'( v ) {
material.clipShadows = v;
},
get 'Plane'() {
return localPlane.constant;
},
set 'Plane'( v ) {
localPlane.constant = v;
}
},
folderGlobal = gui.addFolder( 'Global Clipping' ),
propsGlobal = {
get 'Enabled'() {
return renderer.clippingPlanes !== Empty;
},
set 'Enabled'( v ) {
renderer.clippingPlanes = v ? globalPlanes : Empty;
},
get 'Plane'() {
return globalPlane.constant;
},
set 'Plane'( v ) {
globalPlane.constant = v;
}
};
folderLocal.add( propsLocal, 'Enabled' );
folderLocal.add( propsLocal, 'Shadows' );
folderLocal.add( propsLocal, 'Plane', 0.3, 1.25 );
folderGlobal.add( propsGlobal, 'Enabled' );
folderGlobal.add( propsGlobal, 'Plane', - 0.4, 3 );
// Start
startTime = Date.now();
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
const currentTime = Date.now();
const time = ( currentTime - startTime ) / 1000;
requestAnimationFrame( animate );
object.position.y = 0.8;
object.rotation.x = time * 0.5;
object.rotation.y = time * 0.2;
object.scale.setScalar( Math.cos( time ) * 0.125 + 0.875 );
stats.begin();
renderer.render( scene, camera );
stats.end();
}
</script>
</body>
</html>