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- <!-- Licensed under a BSD license. See license.html for license -->
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
- <title>Three.js - Fundamentals</title>
- <link href="resources/threejs-tutorials.css" rel="stylesheet" />
- <style>
- html, body {
- margin: 0;
- height: 100%;
- }
- canvas {
- width: 100%;
- height: 100%;
- display: block;
- }
- </style>
- </head>
- <body>
- <canvas id="c"></canvas>
- </body>
- <script type="importmap">
- {
- "imports": {
- "three": "../../build/three.module.js",
- "three/addons/": "../../examples/jsm/"
- }
- }
- </script>
- <script type="module">
- import * as THREE from 'three';
- import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
- import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
- function main() {
- const canvas = document.querySelector( '#c' );
- const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
- const scene = new THREE.Scene();
- const aspect = 2; // the canvas default
- const fov = 35;
- const near = 0.1;
- const far = 5000;
- const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
- camera.position.set( - 580, 55, 390 );
- const maxFovX = 40;
- const numBirds = 40;
- const minMax = 700;
- const birdSpeed = 100;
- const useFog = true;
- const useOrbitCamera = true;
- const showHelpers = false;
- if ( useOrbitCamera ) {
- const controls = new OrbitControls( camera, canvas );
- controls.target.set( 0, 0, 0 );
- controls.update();
- }
- renderer.shadowMap.enabled = true;
- const hemiLight = new THREE.HemisphereLight( 0xffffff, 0xffffff, 2 );
- hemiLight.color.setHSL( 0.6, 1, 0.5 );
- hemiLight.groundColor.setHSL( 0.095, 1, 0.5 );
- hemiLight.position.set( 0, 50, 0 );
- scene.add( hemiLight );
- if ( showHelpers ) {
- const hemiLightHelper = new THREE.HemisphereLightHelper( hemiLight, 10 );
- scene.add( hemiLightHelper );
- }
- const dirLight = new THREE.DirectionalLight( 0xffffff, 3 );
- dirLight.color.setHSL( 0.1, 1, 0.95 );
- dirLight.position.set( - 300, 220, 245 );
- scene.add( dirLight );
- dirLight.castShadow = true;
- dirLight.shadow.mapSize.width = 2048;
- dirLight.shadow.mapSize.height = 2048;
- const d = 350;
- dirLight.shadow.camera.left = - d;
- dirLight.shadow.camera.right = d;
- dirLight.shadow.camera.top = d;
- dirLight.shadow.camera.bottom = - d;
- dirLight.shadow.camera.near = 100;
- dirLight.shadow.camera.far = 950;
- dirLight.shadow.bias = - 0.005;
- if ( showHelpers ) {
- const dirLightHeper = new THREE.DirectionalLightHelper( dirLight, 10 );
- scene.add( dirLightHeper );
- }
- const birds = [];
- const loader = new GLTFLoader();
- const fogNear = 1350;
- const fogFar = 1500;
- function rand( min, max ) {
- if ( min === undefined ) {
- min = 0;
- max = 1;
- } else if ( max === undefined ) {
- max = min;
- min = 0;
- }
- return min + Math.random() * ( max - min );
- }
- loader.load( 'resources/models/flamingo/Flamingo.glb', ( gltf ) => {
- const orig = gltf.scene.children[ 0 ];
- orig.castShadow = true;
- orig.receiveShadow = true;
- for ( let i = 0; i < numBirds; ++ i ) {
- const u = i / ( numBirds - 1 );
- const mesh = orig.clone();
- mesh.position.set(
- rand( - 150, 150 ),
- ( u * 2 - 1 ) * 200,
- ( minMax * 2 * i * 1.7 ) % ( minMax * 2 ) - minMax / 2,
- );
- scene.add( mesh );
- mesh.material = mesh.material.clone();
- mesh.material.color.setHSL( rand(), 1, 0.8 );
- const mixer = new THREE.AnimationMixer( mesh );
- mixer.clipAction( gltf.animations[ 0 ] ).setDuration( 1 ).play();
- mixer.update( rand( 10 ) );
- mixer.timeScale = rand( 0.9, 1.1 );
- birds.push( {
- mixer,
- mesh,
- } );
- }
- } );
- window.s = scene;
- if ( useFog ) {
- const vertexShader = `
- varying vec3 vWorldPosition;
- void main() {
- vec4 worldPosition = modelMatrix * vec4( position, 1.0 );
- vWorldPosition = worldPosition.xyz;
- gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
- }
- `;
- const fragmentShader = `
- uniform vec3 topColor;
- uniform vec3 bottomColor;
- uniform float offset;
- uniform float exponent;
- varying vec3 vWorldPosition;
- void main() {
- float h = normalize( vWorldPosition + offset ).y;
- gl_FragColor = vec4( mix( bottomColor, topColor, max( pow( max( h , 0.0), exponent ), 0.0 ) ), 1.0 );
- }
- `;
- const uniforms = {
- topColor: { value: new THREE.Color( 0x88AABB ) },
- bottomColor: { value: new THREE.Color( 0xEFCB7F ) },
- offset: { value: 730 },
- exponent: { value: 0.3 },
- };
- uniforms.topColor.value.copy( hemiLight.color );
- scene.fog = new THREE.Fog( scene.background, fogNear, fogFar );
- scene.fog.color.copy( uniforms.bottomColor.value );
- const skyGeo = new THREE.SphereGeometry( 3000, 32, 15 );
- const skyMat = new THREE.ShaderMaterial( { vertexShader: vertexShader, fragmentShader: fragmentShader, uniforms: uniforms, side: THREE.BackSide } );
- const sky = new THREE.Mesh( skyGeo, skyMat );
- scene.add( sky );
- }
- function resizeRendererToDisplaySize( renderer ) {
- const canvas = renderer.domElement;
- const width = canvas.clientWidth;
- const height = canvas.clientHeight;
- if ( width === canvas.width && height === canvas.height ) {
- return false;
- }
- renderer.setSize( width, height, false );
- return true;
- }
- let then = 0;
- function render( now ) {
- now *= 0.001;
- const deltaTime = now - then;
- then = now;
- if ( resizeRendererToDisplaySize( renderer ) ) {
- const aspect = canvas.clientWidth / canvas.clientHeight;
- const fovX = THREE.MathUtils.radToDeg( 2 * Math.atan( Math.tan( THREE.MathUtils.degToRad( fov ) * 0.5 ) * aspect ) );
- const newFovY = THREE.MathUtils.radToDeg( 2 * Math.atan( Math.tan( THREE.MathUtils.degToRad( maxFovX ) * .5 ) / aspect ) );
- camera.fov = fovX > maxFovX ? newFovY : fov;
- camera.aspect = aspect;
- camera.updateProjectionMatrix();
- }
- for ( const { mesh, mixer } of birds ) {
- mixer.update( deltaTime );
- mesh.position.z = ( mesh.position.z + minMax + mixer.timeScale * birdSpeed * deltaTime ) % ( minMax * 2 ) - minMax;
- }
- renderer.render( scene, camera );
- requestAnimationFrame( render );
- }
- requestAnimationFrame( render );
- }
- main();
- </script>
- </html>
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