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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <title>three.js WebGL 2 - clip cull distance</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>
- <div id="container"></div>
- <div id="info">
- <a href="https://threejs.org" target="_blank" rel="noopener" >three.js</a> - vertex shader clipping via
- <a href="https://registry.khronos.org/webgl/extensions/WEBGL_clip_cull_distance/" target="_blank" rel="noopener" >WEBGL_clip_cull_distance</a>
- <div id="notSupported" style="display:none">WEBGL_clip_cull_distance not supported</div>
- </div>
- <script id="vertexShader" type="x-shader/x-vertex">
- uniform float time;
- varying vec4 vColor;
- void main() {
- vColor = color;
- #ifdef USE_CLIP_DISTANCE
- vec4 worldPosition = modelMatrix * vec4( position, 1.0 );
- gl_ClipDistance[ 0 ] = worldPosition.x - sin( time ) * ( 0.5 );
- #endif
- gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
- }
- </script>
- <script id="fragmentShader" type="x-shader/x-fragment">
- varying vec4 vColor;
- void main() {
- gl_FragColor = vColor;
- }
- </script>
- <script type="importmap">
- {
- "imports": {
- "three": "../build/three.module.js",
- "three/addons/": "./jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import Stats from 'three/addons/libs/stats.module.js';
- let camera, controls, clock, scene, renderer, stats;
- let material;
- init();
- function init() {
- camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 10 );
- camera.position.z = 2;
- scene = new THREE.Scene();
- clock = new THREE.Clock();
- //
- renderer = new THREE.WebGLRenderer( { antialias: true } );
- renderer.setPixelRatio( window.devicePixelRatio );
- renderer.setSize( window.innerWidth, window.innerHeight );
- renderer.setAnimationLoop( animate );
- document.body.appendChild( renderer.domElement );
- if ( renderer.extensions.has( 'WEBGL_clip_cull_distance' ) === false ) {
- document.getElementById( 'notSupported' ).style.display = '';
- return;
- }
- const ext = renderer
- .getContext()
- .getExtension( 'WEBGL_clip_cull_distance' );
- const gl = renderer.getContext();
- gl.enable( ext.CLIP_DISTANCE0_WEBGL );
- // geometry
- const vertexCount = 200 * 3;
- const geometry = new THREE.BufferGeometry();
- const positions = [];
- const colors = [];
- for ( let i = 0; i < vertexCount; i ++ ) {
- // adding x,y,z
- positions.push( Math.random() - 0.5 );
- positions.push( Math.random() - 0.5 );
- positions.push( Math.random() - 0.5 );
- // adding r,g,b,a
- colors.push( Math.random() * 255 );
- colors.push( Math.random() * 255 );
- colors.push( Math.random() * 255 );
- colors.push( Math.random() * 255 );
- }
- const positionAttribute = new THREE.Float32BufferAttribute( positions, 3 );
- const colorAttribute = new THREE.Uint8BufferAttribute( colors, 4 );
- colorAttribute.normalized = true;
- geometry.setAttribute( 'position', positionAttribute );
- geometry.setAttribute( 'color', colorAttribute );
- // material
- material = new THREE.ShaderMaterial( {
- uniforms: {
- time: { value: 1.0 }
- },
- vertexShader: document.getElementById( 'vertexShader' ).textContent,
- fragmentShader: document.getElementById( 'fragmentShader' ).textContent,
- side: THREE.DoubleSide,
- transparent: true,
- vertexColors: true
- } );
- material.extensions.clipCullDistance = true;
- const mesh = new THREE.Mesh( geometry, material );
- scene.add( mesh );
- //
- controls = new OrbitControls( camera, renderer.domElement );
- //
- stats = new Stats();
- document.body.appendChild( stats.dom );
- window.addEventListener( 'resize', onWindowResize );
- }
- function onWindowResize() {
- camera.aspect = window.innerWidth / window.innerHeight;
- camera.updateProjectionMatrix();
- renderer.setSize( window.innerWidth, window.innerHeight );
- }
- function animate() {
- controls.update();
- stats.update();
- material.uniforms.time.value = clock.getElapsedTime();
- renderer.render( scene, camera );
- }
- </script>
- </body>
- </html>
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