three.js绘制地球、飞机与轨迹的效果示例

作者：zhangqh 字体：[增加减小] 来源：互联网时间：2017-05-11

zhangqh通过本文主要向大家介绍了使用three.js的项目,three.js mtl,three.js,three.js官网,three.js教程等相关知识,希望对您有所帮助,也希望大家支持linkedu.com www.linkedu.com

对于three.js不太熟悉的朋友们可以参考这篇文章，threejs官网：https://threejs.org/

首先我们来看下要实现的效果

这个缩小后的图片，下面我们来看下近距离的动态效果。。

效果比较简陋，需要后期再处理。。。

下面进入主题，代码篇。。

HTML部分：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>全球航班</title>
 
 <style>
 html{overflow: hidden;}
 body { margin: 0;}
 </style>

 <script src="js/jquery.min.js"></script>
</head>
<body>
 <!-- 地国 -->
 <div id="zh_globe_container"></div> <!-- 容器 -->
 
 <script src="js/threejs/Detector.js"></script> <!-- webGL浏览器支持检测 -->
 <script src="js/threejs/three.min.js"></script> <!-- 核心js -->
 <script src="js/threejs/stats.min.js"></script> <!-- 性能测试 -->
 <script src="js/threejs/OrbitControls.js"></script> <!-- 地球控制 -->
 <script src="js/socketio-1.4.5.js"></script> <!-- socket -->

 <script src="js/globe.js"></script> <!-- -->
</body>
</html>

</div>

JS部分(globe.js)

1、实现地球

地球贴图(可以在网上下载)

// 地球
function globe() {
 var globeTextureLoader = new THREE.TextureLoader();
 globeTextureLoader.load('images/textures/earth.jpg', function (texture) {
 var globeGgeometry = new THREE.SphereGeometry(200, 100, 100);
 var globeMaterial = new THREE.MeshStandardMaterial({map: texture});
 var globeMesh = new THREE.Mesh(globeGgeometry, globeMaterial);
 group.add(globeMesh);
 group.rotation.x = THREE.Math.degToRad(35);
 group.rotation.y = THREE.Math.degToRad(170);
 });
}

</div>

2、添加球面光源(这里使用的是半球光)

// 光
function lights() {
 var hemisphereLight = new THREE.HemisphereLight(0xffffff, 0x333333, 2);
 hemisphereLight.position.x = 0;
 hemisphereLight.position.y = 0;
 hemisphereLight.position.z = -200;
 group.add(hemisphereLight);
}

</div>

3、添加星点

// 星点
function stars() {
 var starsGeometry = new THREE.Geometry();
 for (var i = 0; i < 2000; i ++) {
 var starVector = new THREE.Vector3(
 THREE.Math.randFloatSpread(2000),
 THREE.Math.randFloatSpread(2000),
 THREE.Math.randFloatSpread(2000)
 );
 starsGeometry.vertices.push(starVector);
 }
 var starsMaterial = new THREE.PointsMaterial({color: 0x888888})
 var starsPoint = new THREE.Points(starsGeometry, starsMaterial);
 group.add(starsPoint);
}

</div>

4、添加飞机

这里需要我们把经纬度坐标转成 xyz 坐标

// 获取position
function getPosition(lng, lat, alt) {
 var phi = (90-lat)*(Math.PI/180),
 theta = (lng+180)*(Math.PI/180),
 radius = alt+200,
 x = -(radius * Math.sin(phi) * Math.cos(theta)),
 z = (radius * Math.sin(phi) * Math.sin(theta)),
 y = (radius * Math.cos(phi));
 return {x: x, y: y, z: z};
}

</div>

画飞机

// 飞机形状(不想画的，可以下载个 飞机模型 使用加载器加载进来)
var planeShape = new THREE.Shape();
planeShape.moveTo( 0, 0);
planeShape.lineTo(0.2, -0.2);
planeShape.lineTo(0.2, -1.3);
planeShape.lineTo(1.6,-2.7);
planeShape.lineTo(1.6,-3);
planeShape.lineTo(0.2, -2.1);
planeShape.lineTo(0.2, -3);
planeShape.lineTo(0.5, -3.4);
planeShape.lineTo(0.5, -3.7);
planeShape.lineTo(0, -3.3);
planeShape.lineTo(-0.5, -3.7);
planeShape.lineTo(-0.5, -3.4);
planeShape.lineTo(-0.2, -3);
planeShape.lineTo(-0.2, -2.1);
planeShape.lineTo(-1.6,-3);
planeShape.lineTo(-1.6,-2.7);
planeShape.lineTo(-0.2, -1.3);
planeShape.lineTo(-0.2, -0.2);
var planeGeometry = new THREE.ShapeGeometry(planeShape);
// 飞机材质
var planeMaterial = new THREE.MeshPhongMaterial({color: 0x0FB4DD, side: THREE.DoubleSide, depthTest: true});

</div>

depthTest作用是能否透过球体看到飞机，如果是false则旋转到球体另一面也能看到飞机

添加飞机

// 添加飞机
function addPlane(item) {
 if(item.anum && item.lng && item.lat) {
 var plane = new THREE.Mesh(planeGeometry, planeMaterial);
 // 旋转
 plane.rotation.z = THREE.Math.degToRad(item.ang);
 // 定位
 var position = getPosition(item.lng, item.lat, 5);
 plane.position.set(position.x, position.y, position.z);
 // 显示/隐藏
 // plane.visible = false;
 // 保存
 planeMarkers[item.anum] = plane;
 // 添加到场景
 group.add(plane);
 // 绘制历史轨迹
 drawHistoryTrack(item.anum);
 }
}

</div>

绘制轨迹(使用socket来获取的飞行轨迹经纬度坐标点)

// 时间段
var curTime = Date.parse(new Date())/1000;
var depTime = curTime - 30*60;
// 轨迹线质
var trackMaterial = new THREE.LineBasicMaterial({color : 0x1B94B1});
// 绘制历史轨迹
function drawHistoryTrack(anum) {
 socket.emit("fullPath", anum, depTime, curTime, function(status, data){
 if(status) {
 var dLength = data.length;
 if(dLength>=2) {
 var trackCoordArr = [];
 for(var i=0; i<dLength; i++) {
  if(data[i].lng && data[i].alt) {
  trackCoordArr.push({lng: data[i].lng, lat: data[i].lat});
  }
 }

 var tcaLength = trackCoordArr.length;
 if(tcaLength>=2) {
  var tcaHalfLength = Math.ceil(tcaLength/2),
  vertexArr = [];

  // 这里只取了三个点(起点、中点、终点)
  var p1 = getPosition(trackCoordArr[0].lng, trackCoordArr[0].lat, 0),
  p2 = getPosition(trackCoordArr[tcaHalfLength].lng, trackCoordArr[tcaHalfLength].lat, tcaLength*0.01),
  p3 = getPosition(trackCoordArr[tcaLength-1].lng, trackCoordArr[tcaLength-1].lat, 0);

  var trackCurve = new THREE.CatmullRomCurve3([
  new THREE.Vector3(p1.x, p1.y, p1.z),
  new THREE.Vector3(p2.x, p2.y, p2.z),
  new THREE.Vector3(p3.x, p3.y, p3.z)
  ]);

  var trackGeometry = new THREE.Geometry(),
  verticesArr = trackCurve.getPoints(tcaLength);

  trackGeometry.vertices = verticesArr;
  
  var trackLine = new THREE.Line(trackGeometry, trackMaterial);
  group.add(trackLine);

  // 动画点
  addLightPoint(p1, tcaLength, verticesArr);
 }
 }
 }
 });
}

</div>

如果要绘制所有点，且头尾是在球面上的曲线，则需要两次循环

var tcaRemainLength = tcaLength-tcaHalfLength
for(var j=0; j<tcaHalfLength; j++) { // 前一半
 var p1 = getPosition(trackCoordArr[j].lng, trackCoordArr[j].lat, j*0.05);
 vertexArr.push(new THREE.Vector3(p1.x, p1.y, p1.z)); 
}
for(var k=tcaRemainLength; k>0; k--) { // 后一半
 var p2 = getPosition(trackCoordArr[tcaLength-k].lng, trackCoordArr[tcaLength-k].lat, k*0.05);
 vertexArr.push(new THREE.Vector3(p2.x, p2.y, p2.z)); 
}

var trackCurve = new THREE.CatmullRomCurve3(vertexArr);

</div>

这个部分看看就行了。。

光点动画

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three.js绘制地球、飞机与轨迹的效果示例

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