# cesium-添加地下模型
在加载模型的时候，可能会出现地下模型，这时就需要开启深度检测了，不然模型会在视图中乱飘
开启深度检测后，如果加载了图层，就有可能遮挡住地下模型
这是就需要使用根据距离改变地下透视程度
# 核心代码
/**
* 根据距离改变地下透视程度
*/
undergroundState() {
let viewer = this._viewer;
let scene = viewer.scene;
let globe = scene.globe;
scene.screenSpaceCameraController.enableCollisionDetection = false;
globe.translucency.frontFaceAlphaByDistance = new Cesium.NearFarScalar(
400.0,
0.0,
800.0,
1.0
);
globe.translucency.enabled = true;
globe.translucency.frontFaceAlphaByDistance.nearValue = Cesium.Math.clamp(0.3, 0.0, 0.1);
globe.translucency.frontFaceAlphaByDistance.farValue = 1.0;
},
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# 完整代码
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Use correct character set. -->
<meta charset="utf-8"/>
<!-- Tell IE to use the latest, best version. -->
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<!-- Make the application on mobile take up the full browser screen and disable user scaling. -->
<meta name="viewport"
content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"/>
<title>cesium-操作面要素透明度</title>
<script src="https://data.sunbt.ltd/lib/Cesium-1.89/Build/Cesium/Cesium.js"></script>
<script src="../../static/lib/vue.min.js"></script>
<script src="../../static/lib/jquery-3.6.0.min.js"></script>
<script src="../../static/data/geodata.js"></script>
<style>
@import url(https://data.sunbt.ltd/lib/Cesium-1.89/Build/Cesium/Widgets/widgets.css);
html,
body, #temp {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
</style>
</head>
<body>
<div id="temp">
<div style="display: -webkit-flex;display: flex;width: 100%;height: 100%">
<div style="width: 90%;height: 100%">
<div id="cesiumContainer"></div>
</div>
<div style="width: 10%;height: 100%;background-color: #d3d3d3;padding: 30px">
<button class="btn" @click="undergroundModel">地下模型</button>
</div>
</div>
</div>
<script>
let EarthComp = new Vue({
el: "#temp",
data: {
_viewer: undefined,
model: null
},
mounted: function () {
let that = this;
this.earthInit();
},
methods: {
/**
* 地球初始化
*/
earthInit() {
let that=this;
//天地图token
let TDT_tk = "92e1a5834c7d3187b1dde67550b7a774";
//Cesium token
let cesium_tk = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJkYWRlMmQ1Ni1iNGMxLTRhY2YtYmExYi1jNjYyNTUxNDhjYzgiLCJpZCI6MjMwODAsInNjb3BlcyI6WyJhc2wiLCJhc3IiLCJhc3ciLCJnYyIsInByIl0sImlhdCI6MTU4OTE4NzE1NH0.QrUVmI13wKIqFwmnsGSR6aMr8FEtbO7jsTA0mqnvbdM";
//标注
let TDT_CIA_C = "http://{s}.tianditu.gov.cn/cia_c/wmts?service=wmts&request=GetTile&version=1.0.0" +
"&LAYER=cia&tileMatrixSet=c&TileMatrix={TileMatrix}&TileRow={TileRow}&TileCol={TileCol}" +
"&style=default&format=tiles&tk=" + TDT_tk;
// 添加mapbox自定义地图实例
let layer = new Cesium.MapboxStyleImageryProvider({
url: 'https://api.mapbox.com/styles/v1',
username: 'sungang',
styleId: 'cky44gl8m0rwn15pqt8ovyhrs',
accessToken: 'pk.eyJ1Ijoic3VuZ2FuZyIsImEiOiJja2VqaW5rbWwwdWc2MnlwaGVrMnBhbnRuIn0.UlFQNpPyJjiYfETSNo5Zkg',
scaleFactor: true
});
//初始页面加载
Cesium.Ion.defaultAccessToken = cesium_tk;
let viewer = new Cesium.Viewer('cesiumContainer', {
geocoder: false, // 位置查找工具
baseLayerPicker: false,// 图层选择器（地形影像服务）
timeline: false, // 底部时间线
homeButton: false,// 视角返回初始位置
fullscreenButton: false, // 全屏
animation: false, // 左下角仪表盘（动画器件）
sceneModePicker: false,// 选择视角的模式（球体、平铺、斜视平铺）
navigationHelpButton: false, //导航帮助按钮
imageryProvider: layer
});
//调用影响中文注记服务
viewer.imageryLayers.addImageryProvider(new Cesium.WebMapTileServiceImageryProvider({
url: TDT_CIA_C,
layer: "tdtImg_c",
style: "default",
format: "tiles",
tileMatrixSetID: "c",
subdomains: ["t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7"],
tilingScheme: new Cesium.GeographicTilingScheme(),
tileMatrixLabels: ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19"],
maximumLevel: 50,
show: false
}))
this._viewer = viewer;
// 去除版权信息
this._viewer._cesiumWidget._creditContainer.style.display = "none";
let model = new Cesium.Cesium3DTileset({
url: 'http://njzy.natapp1.cc/res/data/3dtiles/tianjie/tileset.json',
modelMatrix: Cesium.Matrix4.fromArray(
[0.9972458032561666, 0.04372029028528979, 0.05991113506964879, 0,
-0.03623787897545647, 0.9920229449104262, -0.12073646051879428, 0,
-0.06471185374661931, 0.11823287609043515, 0.9908750491338749, 0,
-663.0794944260269, 1211.490494620055, 2974.1003134818748, 1]),
});
this.model=viewer.scene.primitives.add(model);
this._viewer.flyTo(model, {
offset: {
heading: Cesium.Math.toRadians(20.0),//方向
pitch: Cesium.Math.toRadians(-25),//倾斜角度
range: 1000
}
});
},
undergroundModel() {
let that = this;
//关闭深度检测
let globe = this._viewer.scene.globe;
globe.depthTestAgainstTerrain = false;
this._viewer.scene.primitives.add(new Cesium.Cesium3DTileset({
url: 'http://192.168.1.243:8088/data/3dtiles/tianjie/tileset.json',
modelMatrix: Cesium.Matrix4.fromArray([0.9972433273083445, 0.04373131442771638, 0.05994429311791549, 0, -0.03624054324752937, 0.9920147125640941, -0.12080328257751138, 0, -0.06474850704152399, 0.1182978537201852, 0.9908648992880364, 0, -640.4182153767906, 1170.067138605751, 2946.0255522700027, 1]),
}));
this.undergroundState()
},
/**
* 根据距离改变地下透视程度
*/
undergroundState() {
let viewer = this._viewer;
let scene = viewer.scene;
let globe = scene.globe;
scene.screenSpaceCameraController.enableCollisionDetection = false;
globe.translucency.frontFaceAlphaByDistance = new Cesium.NearFarScalar(
400.0,
0.0,
800.0,
1.0
);
globe.translucency.enabled = true;
globe.translucency.frontFaceAlphaByDistance.nearValue = Cesium.Math.clamp(0.3, 0.0, 0.1);
globe.translucency.frontFaceAlphaByDistance.farValue = 1.0;
},
}
})
</script>
</body>
</html>
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# 示例效果
