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269 lines
6.3 KiB
269 lines
6.3 KiB
2 years ago
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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 - cameras</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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b {
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color: lightgreen;
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}
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</style>
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</head>
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<body>
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<div id="info"><a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> - cameras<br/>
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<b>O</b> orthographic <b>P</b> perspective
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</div>
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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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<script type="importmap">
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{
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"imports": {
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"three": "../build/three.module.js",
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"three/addons/": "./jsm/"
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}
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}
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</script>
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<script type="module">
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import * as THREE from 'three';
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import Stats from 'three/addons/libs/stats.module.js';
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let SCREEN_WIDTH = window.innerWidth;
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let SCREEN_HEIGHT = window.innerHeight;
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let aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
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let container, stats;
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let camera, scene, renderer, mesh;
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let cameraRig, activeCamera, activeHelper;
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let cameraPerspective, cameraOrtho;
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let cameraPerspectiveHelper, cameraOrthoHelper;
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const frustumSize = 600;
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init();
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animate();
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function init() {
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container = document.createElement( 'div' );
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document.body.appendChild( container );
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scene = new THREE.Scene();
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//
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camera = new THREE.PerspectiveCamera( 50, 0.5 * aspect, 1, 10000 );
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camera.position.z = 2500;
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cameraPerspective = new THREE.PerspectiveCamera( 50, 0.5 * aspect, 150, 1000 );
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cameraPerspectiveHelper = new THREE.CameraHelper( cameraPerspective );
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scene.add( cameraPerspectiveHelper );
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//
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cameraOrtho = new THREE.OrthographicCamera( 0.5 * frustumSize * aspect / - 2, 0.5 * frustumSize * aspect / 2, frustumSize / 2, frustumSize / - 2, 150, 1000 );
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cameraOrthoHelper = new THREE.CameraHelper( cameraOrtho );
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scene.add( cameraOrthoHelper );
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//
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activeCamera = cameraPerspective;
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activeHelper = cameraPerspectiveHelper;
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// counteract different front orientation of cameras vs rig
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cameraOrtho.rotation.y = Math.PI;
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cameraPerspective.rotation.y = Math.PI;
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cameraRig = new THREE.Group();
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cameraRig.add( cameraPerspective );
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cameraRig.add( cameraOrtho );
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scene.add( cameraRig );
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//
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mesh = new THREE.Mesh(
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new THREE.SphereGeometry( 100, 16, 8 ),
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new THREE.MeshBasicMaterial( { color: 0xffffff, wireframe: true } )
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);
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scene.add( mesh );
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const mesh2 = new THREE.Mesh(
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new THREE.SphereGeometry( 50, 16, 8 ),
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new THREE.MeshBasicMaterial( { color: 0x00ff00, wireframe: true } )
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);
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mesh2.position.y = 150;
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mesh.add( mesh2 );
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const mesh3 = new THREE.Mesh(
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new THREE.SphereGeometry( 5, 16, 8 ),
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new THREE.MeshBasicMaterial( { color: 0x0000ff, wireframe: true } )
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);
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mesh3.position.z = 150;
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cameraRig.add( mesh3 );
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//
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const geometry = new THREE.BufferGeometry();
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const vertices = [];
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for ( let i = 0; i < 10000; i ++ ) {
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vertices.push( THREE.MathUtils.randFloatSpread( 2000 ) ); // x
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vertices.push( THREE.MathUtils.randFloatSpread( 2000 ) ); // y
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vertices.push( THREE.MathUtils.randFloatSpread( 2000 ) ); // z
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}
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geometry.setAttribute( 'position', new THREE.Float32BufferAttribute( vertices, 3 ) );
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const particles = new THREE.Points( geometry, new THREE.PointsMaterial( { color: 0x888888 } ) );
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scene.add( particles );
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//
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renderer = new THREE.WebGLRenderer( { antialias: true } );
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renderer.setPixelRatio( window.devicePixelRatio );
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renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
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container.appendChild( renderer.domElement );
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renderer.autoClear = false;
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//
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stats = new Stats();
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container.appendChild( stats.dom );
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//
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window.addEventListener( 'resize', onWindowResize );
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document.addEventListener( 'keydown', onKeyDown );
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}
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//
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function onKeyDown( event ) {
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switch ( event.keyCode ) {
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case 79: /*O*/
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activeCamera = cameraOrtho;
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activeHelper = cameraOrthoHelper;
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break;
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case 80: /*P*/
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activeCamera = cameraPerspective;
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activeHelper = cameraPerspectiveHelper;
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break;
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}
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}
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//
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function onWindowResize() {
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SCREEN_WIDTH = window.innerWidth;
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SCREEN_HEIGHT = window.innerHeight;
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aspect = SCREEN_WIDTH / SCREEN_HEIGHT;
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renderer.setSize( SCREEN_WIDTH, SCREEN_HEIGHT );
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camera.aspect = 0.5 * aspect;
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camera.updateProjectionMatrix();
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cameraPerspective.aspect = 0.5 * aspect;
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cameraPerspective.updateProjectionMatrix();
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cameraOrtho.left = - 0.5 * frustumSize * aspect / 2;
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cameraOrtho.right = 0.5 * frustumSize * aspect / 2;
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cameraOrtho.top = frustumSize / 2;
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cameraOrtho.bottom = - frustumSize / 2;
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cameraOrtho.updateProjectionMatrix();
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}
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//
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function animate() {
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requestAnimationFrame( animate );
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render();
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stats.update();
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}
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function render() {
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const r = Date.now() * 0.0005;
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mesh.position.x = 700 * Math.cos( r );
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mesh.position.z = 700 * Math.sin( r );
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mesh.position.y = 700 * Math.sin( r );
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mesh.children[ 0 ].position.x = 70 * Math.cos( 2 * r );
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mesh.children[ 0 ].position.z = 70 * Math.sin( r );
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if ( activeCamera === cameraPerspective ) {
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cameraPerspective.fov = 35 + 30 * Math.sin( 0.5 * r );
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cameraPerspective.far = mesh.position.length();
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cameraPerspective.updateProjectionMatrix();
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cameraPerspectiveHelper.update();
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cameraPerspectiveHelper.visible = true;
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cameraOrthoHelper.visible = false;
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} else {
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cameraOrtho.far = mesh.position.length();
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cameraOrtho.updateProjectionMatrix();
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cameraOrthoHelper.update();
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cameraOrthoHelper.visible = true;
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cameraPerspectiveHelper.visible = false;
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}
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cameraRig.lookAt( mesh.position );
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renderer.clear();
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activeHelper.visible = false;
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renderer.setViewport( 0, 0, SCREEN_WIDTH / 2, SCREEN_HEIGHT );
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renderer.render( scene, activeCamera );
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activeHelper.visible = true;
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renderer.setViewport( SCREEN_WIDTH / 2, 0, SCREEN_WIDTH / 2, SCREEN_HEIGHT );
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renderer.render( scene, camera );
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}
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</script>
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</body>
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</html>
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