three.js 使用geojson ，实现中国地图区域，边缘流动效果

three.js 使用geojson ，实现中国地图区域，边缘流动效果

在线链接：https://threehub.cn/#/codeMirror?navigation=ThreeJS&classify=expand&id=geoBorder

国内站点预览：http://threehub.cn

github地址: https://github.com/z2586300277/three-cesium-examples

import * as THREE from 'three'
import { OrbitControls } from 'three/examples/jsm/controls/OrbitControls.js'const box = document.getElementById('box')const scene = new THREE.Scene()const camera = new THREE.PerspectiveCamera(75, box.clientWidth / box.clientHeight, 0.1, 1000)camera.position.set(0, 0, 500)const renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true, logarithmicDepthBuffer: true })renderer.setSize(box.clientWidth, box.clientHeight)box.appendChild(renderer.domElement)const controls = new OrbitControls(camera, renderer.domElement)controls.enableDamping = truescene.add(new THREE.AmbientLight(0xffffff, 1))const directionalLight = new THREE.DirectionalLight(0xffffff, 2)directionalLight.position.set(300, 300, 300)scene.add(directionalLight)const map = new THREE.TextureLoader().load(`https://file.threehub.cn/` + 'images/channels/lmap.png')map.wrapS = THREE.RepeatWrappingmap.wrapT = THREE.RepeatWrappingmap.needsUpdate = trueanimate()function animate() {requestAnimationFrame(animate)map.offset.x += 0.001controls.update()renderer.render(scene, camera)}window.onresize = () => {renderer.setSize(box.clientWidth, box.clientHeight)camera.aspect = box.clientWidth / box.clientHeightcamera.updateProjectionMatrix()}/* 边界 */
const group = new THREE.Group()fetch(`https://file.threehub.cn/` + 'files/json/chinaBound.json').then(r => r.json()).then(res => {const { features } = resfeatures.forEach((i) => {if (i.geometry.type === 'MultiPolygon') i.geometry.coordinates.forEach((j) => j.forEach((z) => createShapeWithCoord(group, z)))else if (i.geometry.type === 'Polygon') i.geometry.coordinates.forEach((j) => createShapeWithCoord(group, j))else if (i.geometry.type === 'LineString') i.geometry.coordinates.length > 1 && createShapeWithCoord(group, i.geometry.coordinates)})translationOriginForGroup(group)scene.add(group)})function createShapeWithCoord(group, coordinates) {if (coordinates.length < 1000) return // 设置点数限制 如果点太少则不绘制const curvePoints = coordinates.map((k) => coordToVector3(k))const curve = new THREE.CatmullRomCurve3(curvePoints)const geometry = new THREE.TubeGeometry(curve, curvePoints.length - 1, 1, 40, false)const material = new THREE.MeshPhongMaterial({ color: 0xffffff , map , transparent: true })const mesh = new THREE.Mesh(geometry, material)translationOriginForMesh(mesh)group.attach(mesh)}function coordToVector3(coord, slace = 10000) {const [lng, lat] = coordconst x = lng * 20037508.34 / 180const y = Math.log(Math.tan((90 + lat) * Math.PI / 360)) / (Math.PI / 180) * 20037508.34 / 180return new THREE.Vector3(x / slace, y / slace, 0)}function translationOriginForMesh(mesh) {const boundingBox = new THREE.Box3().setFromObject(mesh)boundingBox.getCenter(mesh.position)mesh.geometry.center()}// 设置组中心点
function translationOriginForGroup(group) {const boundingBox = new THREE.Box3().setFromObject(group)boundingBox.getCenter(group.position)group.traverse((c) => {c.isMesh && c.position.sub(group.position)})group.position.set(0, 0, 0)}/*** 名称: 地理边界* 作者: 优雅永不过时 https://github.com/z2586300277
*/