// https://threejs.org/examples/?q=portal#webgl_portal
// https://threejs.org/examples/webgl_portal.html
// uses JS libraries:
// https://threejs.org/examples/jsm/utils/CameraUtils.js
// https://threejs.org/examples/jsm/controls/OrbitControls.js
AB.loadCSS ( '/uploads/threeport/main.css' );
AB.loadCSSstring ( `
body {
color: #444;
}
a {
color: #08f;
} ` );
// make blank div
AB.newDiv ( "container" );
import * as THREE from '/api/threemodule/libs/three.module.js';
import * as CameraUtils from '/uploads/threeport/CameraUtils.js';
// extra edit: CameraUtils.js had to be edited to point to the correct three.module.js
import { OrbitControls } from '/uploads/threejs/OrbitControls.js';
// no more edits
let camera, scene, renderer;
let cameraControls;
let smallSphereOne, smallSphereTwo;
let portalCamera, leftPortal, rightPortal, leftPortalTexture, reflectedPosition,
rightPortalTexture, bottomLeftCorner, bottomRightCorner, topLeftCorner;
init();
animate();
function init() {
const container = document.getElementById( 'container' );
// renderer
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setPixelRatio( window.devicePixelRatio );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
renderer.localClippingEnabled = true;
// scene
scene = new THREE.Scene();
// camera
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 5000 );
camera.position.set( 0, 75, 160 );
cameraControls = new OrbitControls( camera, renderer.domElement );
cameraControls.target.set( 0, 40, 0 );
cameraControls.maxDistance = 400;
cameraControls.minDistance = 10;
cameraControls.update();
//
const planeGeo = new THREE.PlaneGeometry( 100.1, 100.1 );
// bouncing icosphere
const portalPlane = new THREE.Plane( new THREE.Vector3( 0, 0, 1 ), 0.0 );
const geometry = new THREE.IcosahedronGeometry( 5, 0 );
const material = new THREE.MeshPhongMaterial( {
color: 0xffffff, emissive: 0x333333, flatShading: true,
clippingPlanes: [ portalPlane ], clipShadows: true } );
smallSphereOne = new THREE.Mesh( geometry, material );
scene.add( smallSphereOne );
smallSphereTwo = new THREE.Mesh( geometry, material );
scene.add( smallSphereTwo );
// portals
portalCamera = new THREE.PerspectiveCamera( 45, 1.0, 0.1, 500.0 );
scene.add( portalCamera );
//frustumHelper = new THREE.CameraHelper( portalCamera );
//scene.add( frustumHelper );
bottomLeftCorner = new THREE.Vector3();
bottomRightCorner = new THREE.Vector3();
topLeftCorner = new THREE.Vector3();
reflectedPosition = new THREE.Vector3();
leftPortalTexture = new THREE.WebGLRenderTarget( 256, 256, {
minFilter: THREE.LinearFilter,
magFilter: THREE.LinearFilter,
format: THREE.RGBFormat
} );
leftPortal = new THREE.Mesh( planeGeo, new THREE.MeshBasicMaterial( { map: leftPortalTexture.texture } ) );
leftPortal.position.x = - 30;
leftPortal.position.y = 20;
leftPortal.scale.set( 0.35, 0.35, 0.35 );
scene.add( leftPortal );
rightPortalTexture = new THREE.WebGLRenderTarget( 256, 256, {
minFilter: THREE.LinearFilter,
magFilter: THREE.LinearFilter,
format: THREE.RGBFormat
} );
rightPortal = new THREE.Mesh( planeGeo, new THREE.MeshBasicMaterial( { map: rightPortalTexture.texture } ) );
rightPortal.position.x = 30;
rightPortal.position.y = 20;
rightPortal.scale.set( 0.35, 0.35, 0.35 );
scene.add( rightPortal );
// walls
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 planeFront = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0x7f7fff } ) );
planeFront.position.z = 50;
planeFront.position.y = 50;
planeFront.rotateY( Math.PI );
scene.add( planeFront );
const planeBack = new THREE.Mesh( planeGeo, new THREE.MeshPhongMaterial( { color: 0xff7fff } ) );
planeBack.position.z = - 50;
planeBack.position.y = 50;
//planeBack.rotateY( Math.PI );
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( 0xcccccc, 1.5, 250 );
mainLight.position.y = 60;
scene.add( mainLight );
const greenLight = new THREE.PointLight( 0x00ff00, 0.25, 1000 );
greenLight.position.set( 550, 50, 0 );
scene.add( greenLight );
const redLight = new THREE.PointLight( 0xff0000, 0.25, 1000 );
redLight.position.set( - 550, 50, 0 );
scene.add( redLight );
const blueLight = new THREE.PointLight( 0x7f7fff, 0.25, 1000 );
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 renderPortal( thisPortalMesh, otherPortalMesh, thisPortalTexture ) {
// set the portal camera position to be reflected about the portal plane
thisPortalMesh.worldToLocal( reflectedPosition.copy( camera.position ) );
reflectedPosition.x *= - 1.0; reflectedPosition.z *= - 1.0;
otherPortalMesh.localToWorld( reflectedPosition );
portalCamera.position.copy( reflectedPosition );
// grab the corners of the other portal
// - note: the portal is viewed backwards; flip the left/right coordinates
otherPortalMesh.localToWorld( bottomLeftCorner.set( 50.05, - 50.05, 0.0 ) );
otherPortalMesh.localToWorld( bottomRightCorner.set( - 50.05, - 50.05, 0.0 ) );
otherPortalMesh.localToWorld( topLeftCorner.set( 50.05, 50.05, 0.0 ) );
// set the projection matrix to encompass the portal's frame
CameraUtils.frameCorners( portalCamera, bottomLeftCorner, bottomRightCorner, topLeftCorner, false );
// render the portal
thisPortalTexture.texture.encoding = renderer.outputEncoding;
renderer.setRenderTarget( thisPortalTexture );
renderer.state.buffers.depth.setMask( true ); // make sure the depth buffer is writable so it can be properly cleared, see #18897
if ( renderer.autoClear === false ) renderer.clear();
thisPortalMesh.visible = false; // hide this portal from its own rendering
renderer.render( scene, portalCamera );
thisPortalMesh.visible = true; // re-enable this portal's visibility for general rendering
}
function animate() {
requestAnimationFrame( animate );
// move the bouncing sphere(s)
const timerOne = Date.now() * 0.01;
const timerTwo = timerOne + Math.PI * 10.0;
smallSphereOne.position.set(
Math.cos( timerOne * 0.1 ) * 30,
Math.abs( Math.cos( timerOne * 0.2 ) ) * 20 + 5,
Math.sin( timerOne * 0.1 ) * 30
);
smallSphereOne.rotation.y = ( Math.PI / 2 ) - timerOne * 0.1;
smallSphereOne.rotation.z = timerOne * 0.8;
smallSphereTwo.position.set(
Math.cos( timerTwo * 0.1 ) * 30,
Math.abs( Math.cos( timerTwo * 0.2 ) ) * 20 + 5,
Math.sin( timerTwo * 0.1 ) * 30
);
smallSphereTwo.rotation.y = ( Math.PI / 2 ) - timerTwo * 0.1;
smallSphereTwo.rotation.z = timerTwo * 0.8;
// save the original camera properties
const currentRenderTarget = renderer.getRenderTarget();
const currentXrEnabled = renderer.xr.enabled;
const currentShadowAutoUpdate = renderer.shadowMap.autoUpdate;
renderer.xr.enabled = false; // Avoid camera modification
renderer.shadowMap.autoUpdate = false; // Avoid re-computing shadows
// render the portal effect
renderPortal( leftPortal, rightPortal, leftPortalTexture );
renderPortal( rightPortal, leftPortal, rightPortalTexture );
// restore the original rendering properties
renderer.xr.enabled = currentXrEnabled;
renderer.shadowMap.autoUpdate = currentShadowAutoUpdate;
renderer.setRenderTarget( currentRenderTarget );
// render the main scene
renderer.render( scene, camera );
}