three.js 3d 智慧园区

一、页面效果

使用three.js实现智慧城市 智慧园区

 

二、技术选择

中间的建筑相关的显示和效果都是threejs实现的

左右两侧用的是echarts

三、代码结构

1. 画布

用js自己创建一个放置画布的div

 container = document.createElement('div')
 document.body.appendChild(container)

2. 场景的创建

之后的比如几何体 摄像机 光源都是放在场景里面

  scene = new THREE.Scene();

  renderer = new THREE.WebGLRenderer({ antiakuas: true })

  renderer.setClearColor(new THREE.Color("rgba(3,19,52)"), 1)//整个画布的背景颜色

  renderer.setSize(window.innerWidth, window.innerHeight)

renderer.shadowMapEnabled = true;//需要阴影映射

container.appendChild(renderer.domElement)

3. 摄像机

摄像机是有两种类型的

• 透视投影摄像机:PerspectiveCamera会让物体近大远小；
• 正交投影摄像机：OrthographicCamera物体渲染的大小是一致的；

camera = new THREE.PerspectiveCamera(90, window.innerWidth / window.innerHeight, 1, 1000)

camera.position.set(0, 150, 300)//相机位置

camera.lookAt(new THREE.Vector3(0, 0, 0))//相机观看物体的位置

4.光源

光有基本的四种类型：

环境光( AmbientLight )：笼罩在整个空间无处不在的光

点光源( PointLight )：向四面八方发射的单点光源

聚光灯( SpotLight )：发射出锥形状的光， 模拟手电筒，台灯等光源

平行光( DirectinalLight )：平行的一束光，模拟从很远处照射的太阳光

        var ambientLight = new THREE.AmbientLight(0x606060)//环境光

        scene.add(ambientLight)

        var spotLight = new THREE.SpotLight(0xffffff)

        spotLight.position.set(200, 160, 85)

        spotLight.castShadow = true

        scene.add(spotLight)

5.创建栅格平面

Geometry这是存储几何体相关的信息，是为了减少CPU的消耗

栅格用的是线段画出来的

function plane() {

        var geometry = new THREE.Geometry();

        geometry.vertices.push(new THREE.Vector3(-800, 0, 0));

        geometry.vertices.push(new THREE.Vector3(800, 0, 0));

        for (var i = 0; i < 50; i++) {

            var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({ color: "rgba(38,55,84,1)", opacity: 1 }));

            line.position.z = (i * 50) - 800;

            scene.add(line);

 

            var line = new THREE.Line(geometry, new THREE.LineBasicMaterial({ color: "rgba(38,55,84,1)", opacity: 1 }));

            line.position.x = (i * 50) - 800;

            line.rotation.y = 90 * Math.PI / 180;

            scene.add(line);

        }

    }

6.建筑

建筑用的是立方体，需要注意的是可以自己设置一个图片，然后将图片作为纹理贴到立方体上面来；

根据移动立方体的位置，来拼合成建筑；

var loader = new THREE.TextureLoader();

loader.load("./img/cude1.png", (texture) => {

    var geometry = new THREE.BoxGeometry(30, 5, 20);

    var material = new THREE.MeshBasicMaterial({ color: 0x739783, map: texture });

    buildArr[i] = new THREE.Mesh(geometry, material);

    buildArr[i].position.x = 10

    buildArr[i].position.y = 5 + i * 5

    buildArr[i].position.z = -10

    scene.add(buildArr[i]);

})

7.视角的移动

当我们看到视角的远近，其实是摄像机的移动，我们通过修改摄像机的位置，来达到响应的目的；

var cameraz = 10;

var camerax = 10;

var timer;

timer = setInterval(function () {

    cameraz += 1

    camerax += 1

    camera.position.x = 50 - cameraz

    camera.position.z = 100 + cameraz

    if (cameraz >= 300 && camerax >= 50) {

        clearInterval(timer)

    }

}, 30)

for (var i = 0; i < 30; i++) {

    buildArr[i].position.y = 5 + i * 5

}

8.车流

我们先是设置一下管道的几何体和小球，然后同样的修改小球的x y z值来进行流动，需要注意的是小球需要根据管道的路径进行流动，

    var curve = new THREE.CatmullRomCurve3([

        new THREE.Vector3(-150, 2, -280),

        new THREE.Vector3(-110, 2, -50),

        new THREE.Vector3(-10, 2, 0),

        new THREE.Vector3(100, 2, 100),

        new THREE.Vector3(140, 2, 200)

    ], false/*是否闭合*/);

function traffic() {

    //一条

    var tubeGeometry2 = new THREE.TubeGeometry(curve, 100, 2, 50, false);

    var tubeMaterial2 = new THREE.MeshPhongMaterial({

        color: "rgb(45,245,216)",

        transparent: true,

        opacity: 1,

    });

    var tube2 = new THREE.Mesh(tubeGeometry2, tubeMaterial2);

    scene.add(tube2);

    //物体

    geometryP = new THREE.BoxGeometry(5, 5, 5);

    var materialP = new THREE.MeshBasicMaterial({ color: 'rgb(165,244,7)' });

    circleP = new THREE.Mesh(geometryP, materialP);

    scene.add(circleP);

    geometryP.rotateY(Math.PI / 2);

    //circleP.position.set(-80, -40, 0);

}

if (progress > 1.0) {

    circleP.position.set(-150, 2, -280);

    progress = 0

    //return;    //停留在管道末端,否则会一直跑到起点 循环再跑

}

progress += 0.001; //0.0009;

if (curve) {

    let point = curve.getPoint(progress);

    if (point && point.x) {

        circleP.position.set(point.x, point.y, point.z);

    }

}

9.事件

 window.addEventListener("click", onDocumentMouseMove, false)

 

四、相关资料

Threejs：https://threejs.org/docs/#manual/zh/introduction/Creating-a-scene

Echarts:  https://www.echartsjs.com/zh/index.html

github : https://github.com/zhangyxhuomu/Data-visualization-3d/tree/master/three-3d/three-3d