【Cesium开发实战】地下模型功能的实现，可设置透明度及显示隐藏
Cesium有很多很强大的功能，可以在地球上实现很多炫酷的3D效果。今天给大家分享一个可自定义高度的电子围栏。
1.话不多说，先展示
地下模型
2.设计思路
按项目需求，需要对加载在地下部分的模型控制显示隐藏，以及透明度的设置。增加控制面板，是否可查看地下掩埋模型、是否按距离衰减、透明度的设置。
3.具体代码
<template>
<div id="toolbar" class="page">
<table>
<tbody>
<tr>
<td>是否可查看地下掩埋模型</td>
<td>
<input type="checkbox" v-model="viewModel.translucencyEnabled">
</td>
</tr>
<tr>
<td>按距离衰减</td>
<td>
<input type="checkbox" v-model="viewModel.fadeByDistance">
</td>
</tr>
<tr>
<td>透明度</td>
<td>
<input type="range" min="0.0" max="1.0" step="0.1" v-model="viewModel.alpha">
<input type="text" size="5" v-model="viewModel.alpha">
</td>
</tr>
</tbody>
</table>
</div>
</template>
<script setup lang="ts">
import { onMounted, onUnmounted, reactive, watch } from 'vue';
import { Cesium } from '/@/utils/cesium';
const props = defineProps(['viewer']);
const scene = props.viewer.scene;
const globe = scene.globe;
scene.screenSpaceCameraController.enableCollisionDetection = false;
globe.translucency.frontFaceAlphaByDistance = new Cesium.NearFarScalar(
400.0,
0.0,
800.0,
1.0
);
const longitude = 112.396876;
const latitude = 37.934629;
const height = 1100;
const position = Cesium.Cartesian3.fromDegrees(
longitude,
latitude,
height
);
const url = "/src/assets/cesium/ParcLeadMine.glb";
const entity = props.viewer.entities.add({
name: url,
position: position,
model: {
uri: url,
},
});
props.viewer.flyTo(entity);
const polygon = props.viewer.entities.add({
polygon: {
hierarchy: new Cesium.PolygonHierarchy(
Cesium.Cartesian3.fromDegreesArrayHeights([
-3.8152789692233817,
53.124521420389996,
200.20779492422255,
-3.8165955002619016,
53.12555934545405,
205.85834336951655,
-3.8201599842222054,
53.12388420656903,
230.82362697069453,
-3.8198667503545027,
53.123748567587455,
225.53297006293968,
-3.8190548496317476,
53.1240486000822,
221.82677773619432,
-3.817536387097508,
53.122763476393764,
209.94136782255705,
-3.8169125359199336,
53.12285547981627,
210.96626238861327,
-3.8166873871853073,
53.12299403424474,
211.02223937734595,
-3.8163695374580873,
53.12300505277307,
211.25942926271824,
-3.8162743040622313,
53.12281471203994,
212.35109129094147,
-3.8159746138174193,
53.12280996651767,
214.87977416348798,
-3.815429896849304,
53.1236135347983,
209.72496223706005,
])
),
material: Cesium.Color.LIME.withAlpha(0.5),
classificationType: Cesium.ClassificationType.TERRAIN,
},
});
const polyline = props.viewer.entities.add({
polyline: {
positions: Cesium.Cartesian3.fromDegreesArrayHeights([
-3.8098444201746373,
53.1190304262546,
286.1875170545701,
-3.8099801237370663,
53.119539531697576,
288.7733884242394,
-3.810165716635671,
53.11979180761567,
290.9294630315179,
-3.8104840812145357,
53.12007534956926,
292.6392327626228,
-3.8105689502073554,
53.120259094792196,
292.222036965774,
-3.811027311824268,
53.120409248874196,
289.61356291617307,
-3.811530473295422,
53.12063281057782,
284.01098712543586,
-3.8120545342562693,
53.120742539082435,
280.118191867836,
-3.812444493044727,
53.120813289759326,
276.0400221387852,
-3.812779626711285,
53.12094275348024,
271.1187399484896,
-3.8133560322579494,
53.12104757866638,
263.3495497598578,
-3.8137266493960085,
53.12120789867194,
257.73878624321316,
-3.8142552291751133,
53.121321248522904,
251.87265828778177,
-3.814322603988525,
53.12174170121103,
238.7082749547689,
-3.8143764268391314,
53.1219492923309,
235.0371831845662,
-3.8148156514145786,
53.12210819668669,
230.2458816627467,
-3.8155394721966163,
53.1222990144029,
221.33319292262706,
-3.8159828072920927,
53.12203093429715,
223.66664756982703,
-3.816678108944717,
53.12183939425214,
223.8787312412801,
-3.817466081093726,
53.121751900508535,
224.52293229989735,
-3.8183082996527955,
53.12173266141031,
223.3672181535749,
]),
width: 8,
material: new Cesium.PolylineOutlineMaterialProperty({
color: Cesium.Color.YELLOW,
outlineWidth: 2,
outlineColor: Cesium.Color.BLACK,
}),
clampToGround: true,
},
});
var viewModel = reactive({
translucencyEnabled: true,
fadeByDistance: true,
showVectorData: false,
alpha: 0.5,
});
function update() {
globe.translucency.enabled = viewModel.translucencyEnabled;
let alpha = Number(viewModel.alpha);
alpha = !isNaN(alpha) ? alpha : 1.0;
alpha = Cesium.Math.clamp(alpha, 0.0, 1.0);
globe.translucency.frontFaceAlphaByDistance.nearValue = alpha;
globe.translucency.frontFaceAlphaByDistance.farValue = viewModel.fadeByDistance
? 1.0
: alpha;
polygon.show = viewModel.showVectorData;
polyline.show = viewModel.showVectorData;
}
//监听高程
watch(viewModel, (val) => {
if (val) {
update();
}
});
onMounted(() => {
//开启高程
props.viewer.terrainProvider = new Cesium.CesiumTerrainProvider({
url: window.__env__.VITE_TERRAIN_PROVIDER_URL,
});
update();
});
onUnmounted(() => {
props.viewer.terrainProvider = new Cesium.EllipsoidTerrainProvider();
});
</script>
<style scoped>
.page {
position: absolute;
right: 10px;
top: 10px;
color: #fff;
background: #fff;
padding: 10px;
border-radius: 5px;
width: 400px;
}
#toolbar {
color: rgba(42, 42, 42, 0.8);
padding: 4px;
border-radius: 4px;
}
#toolbar input {
vertical-align: middle;
padding-top: 2px;
padding-bottom: 2px;
}
#toolbar .header {
font-weight: bold;
}
</style>
项目需要加载自己的高程数据，大家可以开启Cesium中的高程。
4.3D模型资源
原文地址：https://blog.csdn.net/qq_34512796/article/details/140298660
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