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