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241 lines
5.5 KiB
HTML
241 lines
5.5 KiB
HTML
2 months ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Three.js - Billboard Trees Static Billboards</title>
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<style>
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html, body {
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height: 100%;
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margin: 0;
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}
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#c {
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width: 100%;
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height: 100%;
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display: block;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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</body>
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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/": "../../examples/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 { OrbitControls } from 'three/addons/controls/OrbitControls.js';
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function main() {
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const canvas = document.querySelector( '#c' );
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const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );
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const fov = 75;
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const aspect = 2; // the canvas default
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const near = 0.1;
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const far = 1000;
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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camera.position.set( 0, 2, 5 );
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const controls = new OrbitControls( camera, canvas );
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controls.target.set( 0, 2, 0 );
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controls.minPolarAngle = 0;
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controls.maxPolarAngle = Math.PI / 2;
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controls.update();
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const scene = new THREE.Scene();
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function addLight( position ) {
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const color = 0xFFFFFF;
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const intensity = 3;
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const light = new THREE.DirectionalLight( color, intensity );
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light.position.set( ...position );
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scene.add( light );
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scene.add( light.target );
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}
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addLight( [ - 3, 1, 1 ] );
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addLight( [ 2, 1, .5 ] );
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const trunkRadius = .2;
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const trunkHeight = 1;
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const trunkRadialSegments = 12;
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const trunkGeometry = new THREE.CylinderGeometry(
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trunkRadius, trunkRadius, trunkHeight, trunkRadialSegments );
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const topRadius = trunkRadius * 4;
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const topHeight = trunkHeight * 2;
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const topSegments = 12;
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const topGeometry = new THREE.ConeGeometry(
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topRadius, topHeight, topSegments );
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const trunkMaterial = new THREE.MeshPhongMaterial( { color: 'brown' } );
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const topMaterial = new THREE.MeshPhongMaterial( { color: 'green' } );
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function makeTree( x, z ) {
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const root = new THREE.Object3D();
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const trunk = new THREE.Mesh( trunkGeometry, trunkMaterial );
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trunk.position.y = trunkHeight / 2;
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root.add( trunk );
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const top = new THREE.Mesh( topGeometry, topMaterial );
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top.position.y = trunkHeight + topHeight / 2;
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root.add( top );
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root.position.set( x, 0, z );
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scene.add( root );
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return root;
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}
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function frameArea( sizeToFitOnScreen, boxSize, boxCenter, camera ) {
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const halfSizeToFitOnScreen = sizeToFitOnScreen * 0.5;
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const halfFovY = THREE.MathUtils.degToRad( camera.fov * .5 );
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const distance = halfSizeToFitOnScreen / Math.tan( halfFovY );
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camera.position.copy( boxCenter );
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camera.position.z += distance;
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// pick some near and far values for the frustum that
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// will contain the box.
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camera.near = boxSize / 100;
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camera.far = boxSize * 100;
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camera.updateProjectionMatrix();
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}
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function makeSpriteTexture( textureSize, obj ) {
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const rt = new THREE.WebGLRenderTarget( textureSize, textureSize );
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const aspect = 1; // because the render target is square
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const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
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scene.add( obj );
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// compute the box that contains obj
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const box = new THREE.Box3().setFromObject( obj );
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const boxSize = box.getSize( new THREE.Vector3() );
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const boxCenter = box.getCenter( new THREE.Vector3() );
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// set the camera to frame the box
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const fudge = 1.1;
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const size = Math.max( ...boxSize.toArray() ) * fudge;
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frameArea( size, size, boxCenter, camera );
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renderer.autoClear = false;
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renderer.setRenderTarget( rt );
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renderer.render( scene, camera );
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renderer.setRenderTarget( null );
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renderer.autoClear = true;
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scene.remove( obj );
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return {
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offset: boxCenter.multiplyScalar( fudge ),
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scale: size,
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texture: rt.texture,
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};
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}
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// make billboard texture
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const tree = makeTree( 0, 0 );
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const facadeSize = 64;
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const treeSpriteInfo = makeSpriteTexture( facadeSize, tree );
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function makeSprite( spriteInfo, x, z ) {
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const { texture, offset, scale } = spriteInfo;
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const mat = new THREE.SpriteMaterial( {
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map: texture,
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transparent: true,
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} );
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const sprite = new THREE.Sprite( mat );
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scene.add( sprite );
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sprite.position.set(
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offset.x + x,
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offset.y,
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offset.z + z );
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sprite.scale.set( scale, scale, scale );
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}
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for ( let z = - 50; z <= 50; z += 10 ) {
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for ( let x = - 50; x <= 50; x += 10 ) {
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makeSprite( treeSpriteInfo, x, z );
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}
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}
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scene.background = new THREE.Color( 'lightblue' );
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{
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const size = 400;
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const geometry = new THREE.PlaneGeometry( size, size );
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const material = new THREE.MeshPhongMaterial( { color: 'gray' } );
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const mesh = new THREE.Mesh( geometry, material );
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mesh.rotation.x = Math.PI * - 0.5;
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scene.add( mesh );
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}
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function resizeRendererToDisplaySize( renderer ) {
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const canvas = renderer.domElement;
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const width = canvas.clientWidth;
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const height = canvas.clientHeight;
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const needResize = canvas.width !== width || canvas.height !== height;
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if ( needResize ) {
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renderer.setSize( width, height, false );
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}
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return needResize;
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}
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function render() {
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if ( resizeRendererToDisplaySize( renderer ) ) {
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const canvas = renderer.domElement;
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camera.aspect = canvas.clientWidth / canvas.clientHeight;
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camera.updateProjectionMatrix();
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}
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renderer.render( scene, camera );
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requestAnimationFrame( render );
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}
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requestAnimationFrame( render );
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}
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main();
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</script>
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</html>
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