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160 lines
4.1 KiB
160 lines
4.1 KiB
2 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>three.js webgl - postprocessing - sobel (edge detection)</title>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
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<link type="text/css" rel="stylesheet" href="main.css">
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</head>
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<body>
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<div id="info">
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<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - webgl - postprocessing<br/>
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sobel (edge detection)
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import { GUI } from 'three/addons/libs/lil-gui.module.min.js';
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import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
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import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
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import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js';
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import { LuminosityShader } from 'three/addons/shaders/LuminosityShader.js';
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import { SobelOperatorShader } from 'three/addons/shaders/SobelOperatorShader.js';
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let camera, scene, renderer, composer;
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let effectSobel;
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const params = {
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enable: true
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};
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init();
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animate();
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function init() {
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//
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scene = new THREE.Scene();
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camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 200 );
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camera.position.set( 0, 10, 25 );
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camera.lookAt( scene.position );
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//
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const geometry = new THREE.TorusKnotGeometry( 8, 3, 256, 32, 2, 3 );
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const material = new THREE.MeshPhongMaterial( { color: 0xffff00 } );
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const mesh = new THREE.Mesh( geometry, material );
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scene.add( mesh );
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//
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const ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
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scene.add( ambientLight );
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const pointLight = new THREE.PointLight( 0xffffff, 0.8 );
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camera.add( pointLight );
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scene.add( camera );
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//
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renderer = new THREE.WebGLRenderer();
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( window.innerWidth, window.innerHeight );
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document.body.appendChild( renderer.domElement );
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// postprocessing
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composer = new EffectComposer( renderer );
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const renderPass = new RenderPass( scene, camera );
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composer.addPass( renderPass );
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// color to grayscale conversion
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const effectGrayScale = new ShaderPass( LuminosityShader );
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composer.addPass( effectGrayScale );
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// you might want to use a gaussian blur filter before
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// the next pass to improve the result of the Sobel operator
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// Sobel operator
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effectSobel = new ShaderPass( SobelOperatorShader );
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effectSobel.uniforms[ 'resolution' ].value.x = window.innerWidth * window.devicePixelRatio;
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effectSobel.uniforms[ 'resolution' ].value.y = window.innerHeight * window.devicePixelRatio;
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composer.addPass( effectSobel );
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const controls = new OrbitControls( camera, renderer.domElement );
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controls.minDistance = 10;
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controls.maxDistance = 100;
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//
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const gui = new GUI();
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gui.add( params, 'enable' );
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gui.open();
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//
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window.addEventListener( 'resize', onWindowResize );
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}
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function onWindowResize() {
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camera.aspect = window.innerWidth / window.innerHeight;
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camera.updateProjectionMatrix();
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renderer.setSize( window.innerWidth, window.innerHeight );
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composer.setSize( window.innerWidth, window.innerHeight );
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effectSobel.uniforms[ 'resolution' ].value.x = window.innerWidth * window.devicePixelRatio;
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effectSobel.uniforms[ 'resolution' ].value.y = window.innerHeight * window.devicePixelRatio;
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}
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function animate() {
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requestAnimationFrame( animate );
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if ( params.enable === true ) {
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composer.render();
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} else {
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renderer.render( scene, camera );
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}
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}
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</script>
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</body>
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</html>
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