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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 - portal</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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+ <style>
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+ body {
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+ color: #444;
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+ }
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+ a {
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+ color: #08f;
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+ }
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+ </style>
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+ </head>
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+ <body>
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+
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+ <div id="container"></div>
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+ <div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - portal
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+ </div>
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+
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+ <script type="module">
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+
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+ import * as THREE from '../build/three.module.js';
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+
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+ import { OrbitControls } from './jsm/controls/OrbitControls.js';
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+
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+ let camera, scene, renderer;
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+
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+ let cameraControls;
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+
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+ let smallSphereOne, smallSphereTwo;
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+
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+ let portalCamera, leftPortal, rightPortal, leftPortalTexture, reflectedPosition,
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+ rightPortalTexture, bottomLeftCorner, bottomRightCorner, topLeftCorner, frustumHelper;
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+
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+ init();
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+ animate();
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+
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+ function init() {
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+
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+ const container = document.getElementById( 'container' );
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+
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+ // renderer
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+ renderer = new THREE.WebGLRenderer( { antialias: true } );
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+ renderer.setPixelRatio( window.devicePixelRatio );
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+ container.appendChild( renderer.domElement );
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+ renderer.localClippingEnabled = true;
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+
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+ // scene
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+ scene = new THREE.Scene();
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+
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+ // camera
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+ camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 5000 );
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+ camera.position.set( 0, 75, 160 );
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+
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+ cameraControls = new OrbitControls( camera, renderer.domElement );
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+ cameraControls.target.set( 0, 40, 0 );
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+ cameraControls.maxDistance = 400;
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+ cameraControls.minDistance = 10;
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+ cameraControls.update();
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+
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+ //
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+
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+ const planeGeo = new THREE.PlaneGeometry( 100.1, 100.1 );
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+
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+ let geometry, material;
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+ geometry = new THREE.CylinderGeometry( 0.1, 15 * Math.cos( Math.PI / 180 * 30 ), 0.1, 24, 1 );
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+ material = new THREE.MeshPhongMaterial( { color: 0xffffff, emissive: 0x444444 } );
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+
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+ // bouncing icosphere
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+ const portalPlane = new THREE.Plane( new THREE.Vector3( 0, 0, 1 ), 0.0 );
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+ geometry = new THREE.IcosahedronGeometry( 5, 0 );
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+ material = new THREE.MeshPhongMaterial( {
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+ color: 0xffffff, emissive: 0x333333, flatShading: true,
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+ clippingPlanes: [ portalPlane ], clipShadows: true } );
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+ smallSphereOne = new THREE.Mesh( geometry, material );
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+ scene.add( smallSphereOne );
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+ smallSphereTwo = new THREE.Mesh( geometry, material );
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+ scene.add( smallSphereTwo );
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+
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+ // portals
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+ portalCamera = new THREE.PerspectiveCamera( 45, 1.0, 0.1, 500.0 );
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+ scene.add( portalCamera );
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+ //frustumHelper = new THREE.CameraHelper( portalCamera );
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+ //scene.add( frustumHelper );
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+ bottomLeftCorner = new THREE.Vector3();
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+ bottomRightCorner = new THREE.Vector3();
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+ topLeftCorner = new THREE.Vector3();
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+ reflectedPosition = new THREE.Vector3();
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+
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+ leftPortalTexture = new THREE.WebGLRenderTarget( 256, 256, {
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+ minFilter: THREE.LinearFilter,
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+ magFilter: THREE.LinearFilter,
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+ format: THREE.RGBFormat
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+ } );
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+ leftPortal = new THREE.Mesh( planeGeo, new THREE.MeshBasicMaterial( { map: leftPortalTexture.texture } ) );
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+ leftPortal.position.x = - 30;
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+ leftPortal.position.y = 20;
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+ leftPortal.scale.set( 0.35, 0.35, 0.35 );
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+ scene.add( leftPortal );
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+
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+ rightPortalTexture = new THREE.WebGLRenderTarget( 256, 256, {
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+ minFilter: THREE.LinearFilter,
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+ magFilter: THREE.LinearFilter,
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+ format: THREE.RGBFormat
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+ } );
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+ rightPortal = new THREE.Mesh( planeGeo, new THREE.MeshBasicMaterial( { map: rightPortalTexture.texture } ) );
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+ rightPortal.position.x = 30;
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+ rightPortal.position.y = 20;
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+ rightPortal.scale.set( 0.35, 0.35, 0.35 );
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+ scene.add( rightPortal );
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+
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+ // walls
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+ const planeTop = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xffffff } ) );
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+ planeTop.position.y = 100;
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+ planeTop.rotateX( Math.PI / 2 );
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+ scene.add( planeTop );
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+
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+ const planeBottom = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xffffff } ) );
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+ planeBottom.rotateX( - Math.PI / 2 );
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+ scene.add( planeBottom );
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+
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+ const planeFront = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x7f7fff } ) );
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+ planeFront.position.z = 50;
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+ planeFront.position.y = 50;
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+ planeFront.rotateY( Math.PI );
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+ scene.add( planeFront );
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+
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+ const planeBack = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xff7fff } ) );
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+ planeBack.position.z = - 50;
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+ planeBack.position.y = 50;
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+ //planeBack.rotateY( Math.PI );
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+ scene.add( planeBack );
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+
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+ const planeRight = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x00ff00 } ) );
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+ planeRight.position.x = 50;
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+ planeRight.position.y = 50;
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+ planeRight.rotateY( - Math.PI / 2 );
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+ scene.add( planeRight );
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+
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+ const planeLeft = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xff0000 } ) );
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+ planeLeft.position.x = - 50;
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+ planeLeft.position.y = 50;
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+ planeLeft.rotateY( Math.PI / 2 );
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+ scene.add( planeLeft );
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+
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+ // lights
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+ const mainLight = new THREE.PointLight( 0xcccccc, 1.5, 250 );
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+ mainLight.position.y = 60;
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+ scene.add( mainLight );
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+
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+ const greenLight = new THREE.PointLight( 0x00ff00, 0.25, 1000 );
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+ greenLight.position.set( 550, 50, 0 );
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+ scene.add( greenLight );
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+
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+ const redLight = new THREE.PointLight( 0xff0000, 0.25, 1000 );
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+ redLight.position.set( - 550, 50, 0 );
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+ scene.add( redLight );
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+
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+ const blueLight = new THREE.PointLight( 0x7f7fff, 0.25, 1000 );
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+ blueLight.position.set( 0, 50, 550 );
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+ scene.add( blueLight );
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+
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+ window.addEventListener( 'resize', onWindowResize, false );
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+
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+ }
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+
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+ function onWindowResize() {
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+
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+ camera.aspect = window.innerWidth / window.innerHeight;
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+ camera.updateProjectionMatrix();
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+
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+ renderer.setSize( window.innerWidth, window.innerHeight );
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+
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+ }
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+
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+ function renderPortal( thisPortalMesh, otherPortalMesh, thisPortalTexture ) {
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+
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+ // set the portal camera position to be reflected about the portal plane
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+ thisPortalMesh.worldToLocal( reflectedPosition.copy( camera.position ) );
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+ reflectedPosition.x *= - 1.0; reflectedPosition.z *= - 1.0;
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+ otherPortalMesh.localToWorld( reflectedPosition );
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+ portalCamera.position.copy( reflectedPosition );
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+
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+ // grab the corners of the other portal
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+ // - note: the portal is viewed backwards; flip the left/right coordinates
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+ otherPortalMesh.localToWorld( bottomLeftCorner.set( 50.05, - 50.05, 0.0 ) );
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+ otherPortalMesh.localToWorld( bottomRightCorner.set( - 50.05, - 50.05, 0.0 ) );
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+ otherPortalMesh.localToWorld( topLeftCorner.set( 50.05, 50.05, 0.0 ) );
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+ // set the projection matrix to encompass the portal's frame
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+ portalCamera.frameCorners( bottomLeftCorner, bottomRightCorner, topLeftCorner, false );
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+
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+ // render the portal
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+ thisPortalTexture.texture.encoding = renderer.outputEncoding;
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+ renderer.setRenderTarget( thisPortalTexture );
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+ renderer.state.buffers.depth.setMask( true ); // make sure the depth buffer is writable so it can be properly cleared, see #18897
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+ if ( renderer.autoClear === false ) renderer.clear();
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+ renderer.render( scene, portalCamera );
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+
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+ }
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+
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+ function animate() {
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+
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+ requestAnimationFrame( animate );
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+
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+ // move the bouncing sphere(s)
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+ const timerOne = Date.now() * 0.01;
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+ const timerTwo = timerOne + Math.PI * 10.0;
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+
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+ smallSphereOne.position.set(
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+ Math.cos( timerOne * 0.1 ) * 30,
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+ Math.abs( Math.cos( timerOne * 0.2 ) ) * 20 + 5,
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+ Math.sin( timerOne * 0.1 ) * 30
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+ );
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+ smallSphereOne.rotation.y = ( Math.PI / 2 ) - timerOne * 0.1;
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+ smallSphereOne.rotation.z = timerOne * 0.8;
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+
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+ smallSphereTwo.position.set(
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+ Math.cos( timerTwo * 0.1 ) * 30,
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+ Math.abs( Math.cos( timerTwo * 0.2 ) ) * 20 + 5,
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+ Math.sin( timerTwo * 0.1 ) * 30
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+ );
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+ smallSphereTwo.rotation.y = ( Math.PI / 2 ) - timerTwo * 0.1;
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+ smallSphereTwo.rotation.z = timerTwo * 0.8;
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+
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+ // save the original camera properties
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+ let currentRenderTarget = renderer.getRenderTarget();
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+ let currentXrEnabled = renderer.xr.enabled;
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+ let currentShadowAutoUpdate = renderer.shadowMap.autoUpdate;
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+ renderer.xr.enabled = false; // Avoid camera modification
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+ renderer.shadowMap.autoUpdate = false; // Avoid re-computing shadows
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+
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+ // render the portal effect
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+ renderPortal( leftPortal, rightPortal, leftPortalTexture );
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+ renderPortal( rightPortal, leftPortal, rightPortalTexture );
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+
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+ // restore the original rendering properties
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+ renderer.xr.enabled = currentXrEnabled;
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+ renderer.shadowMap.autoUpdate = currentShadowAutoUpdate;
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+ renderer.setRenderTarget( currentRenderTarget );
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+
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+ // render the main scene
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+ renderer.render( scene, camera );
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+
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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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Johnathon Selstad
