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217 lines
5.8 KiB
217 lines
5.8 KiB
<!-- 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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<!-- Import maps polyfill -->
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<!-- Remove this when import maps will be widely supported -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>
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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({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 = 1;
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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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