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