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<title>three.js refraction</title>
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<a href="https://threejs.org" target="_blank" rel="noopener noreferrer">three.js</a> - refraction
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<!-- Import maps polyfill -->
<!-- Remove this when import maps will be widely supported -->
<script async src="https://unpkg.com/es-module-shims@1.8.0/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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
import { Refractor } from 'three/addons/objects/Refractor.js';
import { WaterRefractionShader } from 'three/addons/shaders/WaterRefractionShader.js';
let camera, scene, renderer, clock;
let refractor, smallSphere;
init();
function init() {
const container = document.getElementById( 'container' );
clock = new THREE.Clock();
// renderer
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
// scene
scene = new THREE.Scene();
// camera
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 500 );
camera.position.set( 0, 75, 160 );
const controls = new OrbitControls( camera, renderer.domElement );
controls.target.set( 0, 40, 0 );
controls.maxDistance = 400;
controls.minDistance = 10;
controls.update();
// refractor
const refractorGeometry = new THREE.PlaneGeometry( 90, 90 );
refractor = new Refractor( refractorGeometry, {
color: 0xcbcbcb,
textureWidth: 1024,
textureHeight: 1024,
shader: WaterRefractionShader
} );
refractor.position.set( 0, 50, 0 );
scene.add( refractor );
// load dudv map for distortion effect
const dudvMap = new THREE.TextureLoader().load( 'textures/waterdudv.jpg', function () {
animate();
} );
dudvMap.wrapS = dudvMap.wrapT = THREE.RepeatWrapping;
refractor.material.uniforms.tDudv.value = dudvMap;
//
const geometry = new THREE.IcosahedronGeometry( 5, 0 );
const material = new THREE.MeshPhongMaterial( { color: 0xffffff, emissive: 0x333333, flatShading: true } );
smallSphere = new THREE.Mesh( geometry, material );
scene.add( smallSphere );
// walls
const planeGeo = new THREE.PlaneGeometry( 100.1, 100.1 );
const planeTop = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xffffff } ) );
planeTop.position.y = 100;
planeTop.rotateX( Math.PI / 2 );
scene.add( planeTop );
const planeBottom = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xffffff } ) );
planeBottom.rotateX( - Math.PI / 2 );
scene.add( planeBottom );
const planeBack = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x7f7fff } ) );
planeBack.position.z = - 50;
planeBack.position.y = 50;
scene.add( planeBack );
const planeRight = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x00ff00 } ) );
planeRight.position.x = 50;
planeRight.position.y = 50;
planeRight.rotateY( - Math.PI / 2 );
scene.add( planeRight );
const planeLeft = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xff0000 } ) );
planeLeft.position.x = - 50;
planeLeft.position.y = 50;
planeLeft.rotateY( Math.PI / 2 );
scene.add( planeLeft );
// lights
const mainLight = new THREE.PointLight( 0xe7e7e7, 2.5, 250, 0 );
mainLight.position.y = 60;
scene.add( mainLight );
const greenLight = new THREE.PointLight( 0x00ff00, 0.5, 1000, 0 );
greenLight.position.set( 550, 50, 0 );
scene.add( greenLight );
const redLight = new THREE.PointLight( 0xff0000, 0.5, 1000, 0 );
redLight.position.set( - 550, 50, 0 );
scene.add( redLight );
const blueLight = new THREE.PointLight( 0xbbbbfe, 0.5, 1000, 0 );
blueLight.position.set( 0, 50, 550 );
scene.add( blueLight );
window.addEventListener( 'resize', onWindowResize );
}
function onWindowResize() {
camera.aspect = window.innerWidth / window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize( window.innerWidth, window.innerHeight );
}
function animate() {
requestAnimationFrame( animate );
const time = clock.getElapsedTime();
refractor.material.uniforms.time.value = time;
smallSphere.position.set(
Math.cos( time ) * 30,
Math.abs( Math.cos( time * 2 ) ) * 20 + 5,
Math.sin( time ) * 30
);
smallSphere.rotation.y = ( Math.PI / 2 ) - time;
smallSphere.rotation.z = time * 8;
renderer.render( scene, camera );
}
</script>
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