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background-v01.html
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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.x = - 0.;
camera.position.y = 350;
camera.position.z = 40.;
const useFog = true;
const useOrbitCamera = false;
const showHelpers = false;
const camSpeed = 0.2;
if ( useOrbitCamera ) {
const controls = new OrbitControls( camera, canvas );
controls.target.set( 0, 100.01, 0.2 );
controls.update();
}
renderer.shadowMap.enabled = true;
const hemiLight = new THREE.HemisphereLight( 0xffffff, 0xffffff, 2 );
hemiLight.color.setHSL( 0.6, 1, 0.6 );
hemiLight.groundColor.setHSL( 0.095, 1, 0.75 );
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 loader = new GLTFLoader();
const camRadius = 600;
const camHeight = 160;
const camTarget = [ 0, 30, 0 ];
const fogNear = 1350;
const fogFar = 1500;
loader.load( 'resources/models/mountain_landscape/scene.gltf', ( gltf ) => {
gltf.scene.traverse( ( child ) => {
if ( child.isMesh ) {
child.castShadow = true;
child.receiveShadow = true;
}
} );
scene.add( gltf.scene );
} );
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( 4000, 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;
}
function render( time ) {
time *= 0.001;
time += 80;
if ( resizeRendererToDisplaySize( renderer ) ) {
camera.aspect = canvas.clientWidth / canvas.clientHeight;
camera.updateProjectionMatrix();
}
if ( ! useOrbitCamera ) {
const angle = Math.sin( time * camSpeed ) + Math.PI * .75;
camera.position.set( Math.cos( angle ) * camRadius, camHeight, Math.sin( angle ) * camRadius );
camera.lookAt( ...camTarget );
}
renderer.render( scene, camera );
requestAnimationFrame( render );
}
requestAnimationFrame( render );
}
main();
</script>
</html>