javascript
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three.js
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							<!DOCTYPE html>
<html lang="en">
	<head>
		<title>three.js webgl - postprocessing - sobel (edge detection)</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="info">
			<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - webgl - postprocessing<br/>
			sobel (edge detection)
		</div>

		<script type="module">

			import * as THREE from '../build/three.module.js';

			import { GUI } from './jsm/libs/dat.gui.module.js';

			import { OrbitControls } from './jsm/controls/OrbitControls.js';

			import { EffectComposer } from './jsm/postprocessing/EffectComposer.js';
			import { RenderPass } from './jsm/postprocessing/RenderPass.js';
			import { ShaderPass } from './jsm/postprocessing/ShaderPass.js';

			import { LuminosityShader } from './jsm/shaders/LuminosityShader.js';
			import { SobelOperatorShader } from './jsm/shaders/SobelOperatorShader.js';

			var camera, scene, renderer, composer;

			var camera, scene, renderer, composer;

			var effectSobel;

			var params = {
				enable: true
			};

			init();
			animate();

			function init() {

				//

				scene = new THREE.Scene();

				camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 1000 );
				camera.position.set( 0, 10, 25 );
				camera.lookAt( scene.position );

				//

				var geometry = new THREE.TorusKnotBufferGeometry( 8, 3, 256, 32, 2, 3 );
				var material = new THREE.MeshPhongMaterial( { color: 0xffff00 } );

				var mesh = new THREE.Mesh( geometry, material );
				scene.add( mesh );

				//

				var ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
				scene.add( ambientLight );

				var pointLight = new THREE.PointLight( 0xffffff, 0.8 );
				camera.add( pointLight );
				scene.add( camera );

				//

				renderer = new THREE.WebGLRenderer();
				renderer.setPixelRatio( window.devicePixelRatio );
				renderer.setSize( window.innerWidth, window.innerHeight );
				document.body.appendChild( renderer.domElement );

				// postprocessing

				composer = new EffectComposer( renderer );
				var renderPass = new RenderPass( scene, camera );
				composer.addPass( renderPass );

				// color to grayscale conversion

				var effectGrayScale = new ShaderPass( LuminosityShader );
				composer.addPass( effectGrayScale );

				// you might want to use a gaussian blur filter before
				// the next pass to improve the result of the Sobel operator

				// Sobel operator

				effectSobel = new ShaderPass( SobelOperatorShader );
				effectSobel.uniforms[ 'resolution' ].value.x = window.innerWidth * window.devicePixelRatio;
				effectSobel.uniforms[ 'resolution' ].value.y = window.innerHeight * window.devicePixelRatio;
				composer.addPass( effectSobel );

				var controls = new OrbitControls( camera, renderer.domElement );

				//

				var gui = new GUI();

				gui.add( params, 'enable' );
				gui.open();

				//

				window.addEventListener( 'resize', onWindowResize, false );

			}

			function onWindowResize() {

				camera.aspect = window.innerWidth / window.innerHeight;
				camera.updateProjectionMatrix();

				renderer.setSize( window.innerWidth, window.innerHeight );
				composer.setSize( window.innerWidth, window.innerHeight );

				effectSobel.uniforms[ 'resolution' ].value.x = window.innerWidth * window.devicePixelRatio;
				effectSobel.uniforms[ 'resolution' ].value.y = window.innerHeight * window.devicePixelRatio;

			}

			function animate() {

				requestAnimationFrame( animate );

				if ( params.enable === true ) {

					composer.render();

				} else {

					renderer.render( scene, camera );

				}

			}

		</script>

	</body>
</html>