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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>
<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.3.6/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 { GUI } from 'three/addons/libs/lil-gui.module.min.js';
import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js';
import { LuminosityShader } from 'three/addons/shaders/LuminosityShader.js';
import { SobelOperatorShader } from 'three/addons/shaders/SobelOperatorShader.js';
let camera, scene, renderer, composer;
let effectSobel;
const params = {
enable: true
};
init();
animate();
function init() {
//
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 0.1, 200 );
camera.position.set( 0, 10, 25 );
camera.lookAt( scene.position );
//
const geometry = new THREE.TorusKnotGeometry( 8, 3, 256, 32, 2, 3 );
const material = new THREE.MeshPhongMaterial( { color: 0xffff00 } );
const mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );
//
const ambientLight = new THREE.AmbientLight( 0xcccccc, 0.4 );
scene.add( ambientLight );
const 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 );
const renderPass = new RenderPass( scene, camera );
composer.addPass( renderPass );
// color to grayscale conversion
const 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 );
const controls = new OrbitControls( camera, renderer.domElement );
controls.minDistance = 10;
controls.maxDistance = 100;
//
const gui = new GUI();
gui.add( params, 'enable' );
gui.open();
//
window.addEventListener( 'resize', onWindowResize );
}
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>