# cesium-裁剪模型
使用和裁剪地面差不多的方式进行模型裁剪
# 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>Hello World!</title>
<script src="../Cesium-1.89/Build/Cesium/Cesium.js"></script>
<style>
@import url(../Cesium-1.89/Build/Cesium/Widgets/widgets.css);
html,
body,
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
#eye {
position: absolute;
width: 20%;
height: 20%;
bottom: 0;
right: 0;
z-index: 999;
background: red;
border: solid blue 1px;
}
#show {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<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 onclick="cameraLookAtTransform()">模型定位</button>
<button onclick="clipModel()">裁剪模型</button>
</div>
</div>
<div id="slider"></div>
<video id="daolu" muted autoplay loop crossorigin controls>
<source src="../../static/data/daolu.mp4" type="video/mp4"/>
</video>
<script>
//Cesium token
let cesium_tk = "token";
Cesium.Ion.defaultAccessToken = cesium_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: 'styleId',
accessToken: 'accessToken',
scaleFactor: true
});
let viewer = new Cesium.Viewer('cesiumContainer', {
imageryProvider: layer,
geocoder: false,
homeButton: false,
sceneModePicker: false,
baseLayerPicker: false,
navigationHelpButton: false,
animation: false,
timeline: false,
fullscreenButton: false,
vrButton: false
});
viewer._cesiumWidget._creditContainer.style.display = "none";
let model = new Cesium.Cesium3DTileset({
url: '../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]),
});
let tileset = viewer.scene.primitives.add(model);
//模型定位
function cameraLookAtTransform() {
var boundingSphere = model.boundingSphere
viewer.camera.viewBoundingSphere(boundingSphere, new Cesium.HeadingPitchRange(Cesium.Math.toRadians(120.0), Cesium.Math.toRadians(-10), boundingSphere.radius * 2.5))
viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY)
}
function clipModel() {
let m_b3dm = model;
this.clippingPlanes = m_b3dm.clippingPlanes = loadClip();
let clippingPlanes = this.clippingPlanes;
let boundingSphere = m_b3dm.boundingSphere;
for (let i = 0; i < clippingPlanes.length; ++i) {
let plane = clippingPlanes.get(i);
let planeEntity = viewer.entities.add({ //添加平面实体 直观裁切面
id: '裁切面' + i,
position: boundingSphere.center,// offset, 根据3dtiles同步调整裁切面高度
plane: {
dimensions: new Cesium.Cartesian2(150, 150),//(radius * 2.5, radius * 2.5),
material: Cesium.Color.WHITE.withAlpha(0.0),
plane: new Cesium.CallbackProperty(createPlaneUpdateFunction(plane), false),//回调方法
outline: true,
outlineColor: Cesium.Color.WHITE
}
});
}
CreateSlider('slider', 200, 20, 300, 'slider');
}
function loadClip() {
this.clippingPlanes = new Cesium.ClippingPlaneCollection({
planes: [
new Cesium.ClippingPlane(new Cesium.Cartesian3(1.0, 0.0, 0), 0),
],
edgeColor: Cesium.Color.RED,
edgeWidth: 1.0,
unionClippingRegions: true, //true 才能多个切割
})
return this.clippingPlanes
}
function createPlaneUpdateFunction(plane) {
return function () {
if (window.localStorage.getItem('slider')) {
plane.distance = window.localStorage.getItem('slider');
return plane;
}
plane.distance = 0;
return plane;
};
}
function CreateSlider(f_id, left, top, max, localStoragename) {
let fEve = document.getElementById(f_id);
window.localStorage.setItem(localStoragename, 0);
let sliderDiv = document.createElement('div');
sliderDiv.style.position = 'absolute';
sliderDiv.style.left = left + 'px';
sliderDiv.style.top = top + 'px';
sliderDiv.style.zIndex = 99;
//滑动长条
let outerDiv = document.createElement('div');
outerDiv.style.position = 'absolute';
outerDiv.style.width = max + 'px';
outerDiv.style.height = '8px';
outerDiv.style.margin = '6px 0 0 0';
outerDiv.style.background = '#fff';
outerDiv.style.border = 'none';
outerDiv.style.borderRadius = '3px';
sliderDiv.appendChild(outerDiv);
//滑动条指针
let innerDiv = document.createElement('div');
innerDiv.style.position = 'absolute';
innerDiv.style.height = '20px';
innerDiv.style.width = '5px';
innerDiv.style.left = max / 2 + 'px';
innerDiv.style.background = 'chocolate';
innerDiv.style.border = '1px solid';
innerDiv.style.borderRadius = '3px';
sliderDiv.appendChild(innerDiv);
fEve.appendChild(sliderDiv);
function getPos(ev) {
let scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
let scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
return {x: ev.clientX + scrollLeft, y: ev.clientY + scrollTop};
}
function getStyle(obj, name) {
if (obj.currentStyle) {
return obj.currentStyle[name];
} else {
return getComputedStyle(obj, false)[name];
}
}
innerDiv.onmousedown = function (ev) {
let oEvent = ev || event;
let pos = getPos(oEvent);
let disx = pos.x - parseInt(getStyle(innerDiv, 'left'));
document.onmousemove = function (ev) {
let oEvent = ev || event;
let pos = getPos(oEvent);
let l = pos.x - disx;
if (l < 0) {
l = 0;
}
if (l > parseInt(getStyle(outerDiv, 'width')) - parseInt(getStyle(innerDiv, 'width'))) {
l = parseInt(getStyle(outerDiv, 'width')) - parseInt(getStyle(innerDiv, 'width'))
}
innerDiv.style.left = l + 'px';
window.localStorage.setItem(localStoragename, l - max / 2);
}
document.onmouseup = function () {
document.onmousemove = null;
document.onmouseup = null;
}
return false;
}
}
</script>
</body>
</html>
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# 实现效果
