Apps/Sandcastle/gallery/Geometry Height Reference.html

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<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="An example for how to use the HeightReference property on different geometry entities.">
    <meta name="cesium-sandcastle-labels" content="Geometries">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script>
    <script type="text/javascript">
        if(typeof require === 'function') {
            require.config({
                baseUrl : '../../../Source',
                waitSeconds : 120
            });
        }
    </script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
</style>
<div id="cesiumContainer" class="fullSize"></div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar"></div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
var cesiumTerrainProvider = Cesium.createWorldTerrain();
var ellipsoidTerrainProvider = new Cesium.EllipsoidTerrainProvider();

var viewer = new Cesium.Viewer('cesiumContainer', {
    baseLayerPicker : false,
    terrainProvider : cesiumTerrainProvider
});

// depth test against terrain is required to make the polygons clamp to terrain
// instead of showing through it from underground
viewer.scene.globe.depthTestAgainstTerrain = true;

Sandcastle.addToolbarMenu([{
    text : 'Polygons',
    onselect : function() {
        viewer.entities.removeAll();
        addPolygons();
    }
}, {
    text : 'Boxes, Cylinders and Ellipsoids',
    onselect : function() {
        viewer.entities.removeAll();
        addGeometries();
    }
}]);

Sandcastle.addToolbarMenu([{
    text : 'Terrain Enabled',
    onselect : function() {
        viewer.scene.terrainProvider = cesiumTerrainProvider;
    }
}, {
    text : 'Terrain Disabled',
    onselect : function() {
        viewer.scene.terrainProvider = ellipsoidTerrainProvider;
    }
}]);

var longitude = 6.950615989890521;
var latitude = 45.79546589994886;
var delta = 0.001;

function addGeometry(i, j) {
    var west = longitude + delta * i;
    var north = latitude + delta * j + delta;

    var type = Math.floor(Math.random() * 3);
    if (type === 0) {
        viewer.entities.add({
            position: Cesium.Cartesian3.fromDegrees(west, north, 0.0),
            box : {
                dimensions : new Cesium.Cartesian3(40.0, 30.0, 50.0),
                material : Cesium.Color.fromRandom({alpha : 1.0}),
                heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
            }
        });
    } else if (type === 1) {
        viewer.entities.add({
            position: Cesium.Cartesian3.fromDegrees(west, north, 0.0),
            cylinder : {
                length :50.0,
                topRadius : 20.0,
                bottomRadius : 20.0,
                material : Cesium.Color.fromRandom({alpha : 1.0}),
                heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
            }
        });
    } else {
        viewer.entities.add({
            position: Cesium.Cartesian3.fromDegrees(west, north, 0.0),
            ellipsoid : {
                radii : new Cesium.Cartesian3(20.0, 15.0, 25.0),
                material : Cesium.Color.fromRandom({alpha : 1.0}),
                heightReference: Cesium.HeightReference.CLAMP_TO_GROUND
            }
        });
    }
}

function addGeometries(){
    for (var i = 0; i < 4; i++) {
        for (var j = 0; j < 4; j++) {
            addGeometry(i, j);
        }
    }
    viewer.zoomTo(viewer.entities);
}

function addPolygon(i, j) {
    var west = longitude + delta * i;
    var east = longitude + delta * i + delta;

    var south = latitude + delta * j;
    var north = latitude + delta * j + delta;
    var a = Cesium.Cartesian3.fromDegrees(west, south);
    var b = Cesium.Cartesian3.fromDegrees(west, north);
    var c = Cesium.Cartesian3.fromDegrees(east, north);
    var d = Cesium.Cartesian3.fromDegrees(east, south);

    var positions = [a, b, c, d];
    viewer.entities.add({
        polygon : {
            hierarchy : positions,
            material : Cesium.Color.fromRandom({alpha : 1}),
            height : 40.0,
            heightReference : Cesium.HeightReference.RELATIVE_TO_GROUND,
            extrudedHeight : 0.0,
            extrudedHeightReference : Cesium.HeightReference.CLAMP_TO_GROUND
        }
    });
}

function addPolygons() {
    // create 16 polygons that are side-by-side
    for (var i = 0; i < 4; i++) {
        for (var j = 0; j < 4; j++) {
            addPolygon(i, j);
        }
    }
    viewer.camera.lookAt(Cesium.Cartesian3.fromDegrees(longitude, latitude, 1500), new Cesium.HeadingPitchRange(-Cesium.Math.PI/2, -Cesium.Math.PI_OVER_FOUR, 2000));
    viewer.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);
}
//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    startup(Cesium);
} else if (typeof require === 'function') {
    require(['Cesium'], startup);
}
</script>
</body>
</html>