Primitives versus Entities

[rob_m...@hotmail.com]

We just downloaded Cesium 1.15, and I'm confused about the future of primitives. The change log for 1.15 says:

◦Deprecated RectanglePrimitive . It will be removed in 1.17. Use RectangleGeometry or Entity.rectangle instead.
◦Deprecated EllipsoidPrimitive . It will be removed in 1.17. Use EllipsoidGeometry or Entity.ellipsoid instead.

We currently use both of these primitive objects. I have updated most of our code to use Entity.<object> instead. But there are some places where performance seems to take quite a hit when using Entities instead of Primitives.

A simple example of the performance issue is loading about 1,000 EllipsoidPrimitive versus Entity.ellipsoid objects. Loading the Entity.ellipsoid objects takes about 3 to 4 times longer. Updating the color or size of these objects also takes about 3 to 4 times longer than updating the EllipsoidPrimitive objects.

Another issue I'm having is I'm experiencing a crash when I try to update the size of a bunch (about 1,000) of Entity.ellipsoid objects based on zoom level. I have a listener attached to the ScreenSpaceEventType.WHEEL and I the camera height to scale the size of the ellipsoids. This worked without any problems with EllipsoidPrimitives, but the browser quickly crashes with Entity.ellipsoids. I have entities.suspendEvents and entities.resumeEvents around the resizing code just in case, but this makes no difference.

A couple of questions:
1) Will these primitives be removed in 1.17 as the change log states?
2) What's the best method to update properties of Entities (such as the material or radii of an ellipsoid) for best performance?

Thanks,
Rob

[Matthew Amato]

RectanglePrimitive existed before Geometry and Appearances were around and is now just a really lightweight wrapper over the underlying `Primitive` object.  Additionally, a lot of the features that have been added to Primitives over time were never carried over into RectanglePrimitive (like extruding and terrain draping).  This left RectanglePrimitive in a state of limbo and because we already have 2 other ways to create rectangles (Entities and Primitives) we decided it was better to remove it to help further streamline the Cesium API.  (The same is true for Polygon, which was also deprecated this past release).  Ultimately, they are a left-over part of Cesium that should have been deprecated a long time ago.

EllipsoidPrimitive is a bit of a different beast.  It uses raycasting for rendering instead of the Primitive object.  While the motivations for removing it from the public API are similar to RectanglePrimitive, EllipsoidPrimitive has several additional drawbacks (such as lack of 2D and Columbus View support as well as not working on a lot of handheld devices because raycasting needs better precision than what mobile devices usually offer).  EllipsoidPrimitive is used internally for Sun rendering, so it's not being physically removed from the code yet (but will be done from the public API so client apps should act as if it's no longer an option).

To answer your specific questions:

1. RectanglePrimitive and Polygon will both be removed, EllipsoidPrimitive will no longer be part of the public API, but will still exist as a private detail implementation.

2. At a high-level, don't simply re-assign the `radii` or `material` properties every time you need to update.  For non-simulation-time dynamic properties, use a CallbackProperty that lets use specify a function that computes the desired size.  For simulation clock-based dynamic properties, use TimeIntervaCollectionProperty or SampledProperty. There's lots of examples on the forum that you should be able to find.  If you are still having problems, please provide a code snippet of exactly what you are trying to do and I can provide some additional feedback.  This is an area long-overdue for a tutorial, maybe I'll try and finally carve out the time to write one soon.

For your zoom-level crash, if you can provide a working code-snippet (something in Sandcastle would be ideal), I'd be happy to debug it for you, ultimately using a CallbackProperty should fix this use case.

Hope that helps,

Matt

 

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[rob_m...@hotmail.com]

I have implemented the CallbackProperty concept, and that has eliminated the browser crash that I was experiencing. However, the time to load and the time to update is still VERY slow compared to what I was doing before with the EllipsoidPrimitives.

I've been trying to put together an example for Sandcastle to demonstrate the issue, but I'm having a problem using the CallbackProperty in Sandcastle (while it works fine on my local machine). Maybe there's something unique to Sandcastle I should be doing? If you run the example code below as is I'm getting an "undefined" error stating "this._callback is not a function". If you comment out the CallbackProperty lines and uncomment the hardcoded lines below them the spheres will load.

Questions:
1) Is there something special I need to do in Sandcastle to get CallbackProperties to work?
2) Is there something I can do to speed up the loading of these spheres and to speed up changing the properties of these spheres?

Sandcastle Example below:
(I don't know of any special code tags so just pasting code from Sandcastle)

var viewer = new Cesium.Viewer('cesiumContainer');
var VORMODE = 1;

function getSize() {
var cameraHeight = viewer.camera.positionCartographic.height;

var minSize = 50.0;
var maxSize = 20000.0;
var size = cameraHeight / 50.0;

if (size < minSize) {
size = minSize;
}
if (size > maxSize) {
size = maxSize;
}

return new Cesium.Cartesian3(size, size, size);
}

function getColor(MON) {
switch (VORMODE) {
case 1:
return new Cesium.Color(1.0, 1.0, 0.0, 1.0);

case 2:
if (MON === 1) {
return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
}
break;

case 3:
if (MON === 0) {
return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
}
break;

case 4:
if (MON === 1) {
return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
}
else {
return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
}
break;
}
}

function getVisibility(MON) {
switch (VORMODE) {
case 1:
return true;

case 2:
if (MON === 1) {
return true;
}
else {
return false;
}
break;

case 3:
if (MON === 0) {
return true;
}
else {
return false;
}
break;

case 4:
return true;

case 5:
return false;
}
}

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var arrData = strData.split(";",-1);

for (var i=0; i<arrData.length; i++){

var strFields = arrData[i].split(",",-1);

var LAT = parseFloat(strFields[0]);
var LON = parseFloat(strFields[1]);
var MON = parseInt(strFields[2],10);

//console.log("MON = " + MON);
//console.log("Lat = " + LAT);
//console.log("Lon = " + LON);
viewer.entities.add({
position: Cesium.Cartesian3.fromDegrees(LON, LAT, 0.0),
ellipsoid: {
radii: new Cesium.CallbackProperty(getSize, false),
material: new Cesium.CallbackProperty(getColor(MON), false),
show: new Cesium.CallbackProperty(getVisibility(MON), false)
// radii: new Cesium.Cartesian3(30000.0, 30000.0, 30000.0),
// material: new Cesium.Color(1.0, 1.0, 0.0, 1.0),
// show: true
},
MON: MON
});

}


//Sandcastle.addToolbarButton('1', function(){
// VORMODE = 1;
//});

Sandcastle.addToolbarMenu([
{
text : 'Current',
onselect : function() {
VORMODE = 1;
}
},
{
text : 'MON',
onselect : function() {
VORMODE = 2;
}
},
{
text : 'Discontinued',
onselect : function() {
VORMODE = 3;
}
},
{
text : 'MON & Discontinued',
onselect : function() {
VORMODE = 4;
}
},
{
text : 'Clear',
onselect : function() {
VORMODE = 5;
}
}
]);

[rob_m...@hotmail.com]

I've experimented with the ellipsoid subdivisions, stackPartitions and slicePartitions, and the performance is significantly improved by reducing these settings. So I thought I would hook these up to CallbackProperties. The initial load time is definitely improved, but the time to update these properties is really long.

Am I doing something wrong?

Here's the code to run in Sandcastle. I still can't get Sandcastle to work with the CallbackProperties.

Sandcastle Example:

var viewer = new Cesium.Viewer('cesiumContainer');
var VORMODE = 1;

// *****************************************************************************

function getSize() {
var cameraHeight = viewer.camera.positionCartographic.height;

var minSize = 50.0;
var maxSize = 20000.0;
var size = cameraHeight / 50.0;

if (size < minSize) {
size = minSize;
}
if (size > maxSize) {
size = maxSize;
}

return new Cesium.Cartesian3(size, size, size);
}

// *****************************************************************************

function getColor(MON) {
switch (VORMODE) {
case 1:
return new Cesium.Color(1.0, 1.0, 0.0, 1.0);

case 2:
if (MON === 1) {
return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
}
break;

case 3:
if (MON === 0) {
return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
}
break;

case 4:
if (MON === 1) {
return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
}
else {
return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
}
break;
}
}

// *****************************************************************************

function getVisibility(MON) {
switch (VORMODE) {
case 1:
return true;

case 2:
if (MON === 1) {
return true;
}
else {
return false;
}
break;

case 3:
if (MON === 0) {
return true;
}
else {
return false;
}
break;

case 4:
return true;

case 5:
return false;
}
}

// *****************************************************************************
function getSubdivisions() {
var cameraHeight = viewer.camera.positionCartographic.height;

if (cameraHeight > 6000000) { return 16; } else
if (cameraHeight > 2000000) { return 32; } else
if (cameraHeight > 1000000) { return 64; } else
{ return 128;}

}

// *****************************************************************************
function getPartitions() {
var cameraHeight = viewer.camera.positionCartographic.height;

if (cameraHeight > 6000000) { return 8; } else
if (cameraHeight > 2000000) { return 16; } else
if (cameraHeight > 1000000) { return 32; } else
{ return 64;}

show: new Cesium.CallbackProperty(getVisibility(MON), false),
subdivisions: new Cesium.CallbackProperty(getSubdivisions, false),
stackPartitions: new Cesium.CallbackProperty(getPartitions, false),
slicePartitions: new Cesium.CallbackProperty(getPartitions, false)

// radii: new Cesium.Cartesian3(30000.0, 30000.0, 30000.0),
// material: new Cesium.Color(1.0, 1.0, 0.0, 1.0),
// show: true,

// subdivisions: 16,
// stackPartitions: 8,
// slicePartitions: 8
},
MON: MON

[Hannah Pinkos]

Hello,

Your error is in these two lines of code:

            material: new Cesium.CallbackProperty(getColor(MON), false),
            show: new Cesium.CallbackProperty(getVisibility(MON), false),

Once you call getColor with the parameter MON, it returns a Color.  CallbackProperty expects a function as the first argument, so it would need to be something along the lines of new Cesium.CallbackProperty(getColor, false) instead.

Best,

Hannah

[rob_m...@hotmail.com]

Hannah,

Thank you for the response. However, I guess I'm still confused. getColor is a function. And I need to pass a parameter to the function...

Can I not pass parameters to functions used with a CallbackProperty?

Can you modify the example I provided to demonstrate how to make it work?

By the way this code works fine in my development environment and on the web. It is just VERY slow when using the CallbackProperties.

[Hannah Pinkos]

You need to have the getColor function return a function then.  Like this:

function getColor(MON) {
    return function(){

        switch (VORMODE) {
            case 1:
                return new Cesium.Color(1.0, 1.0, 0.0, 1.0);

            case 2:
                if (MON === 1) {
                    return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
                }
                break;

            case 3:
                if (MON === 0) {
                    return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
                }
                break;

            case 4:
                if (MON === 1) {
                    return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
                }
                else {
                    return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
                }
                break;
        }

    };
}

The CallbackProperty will call the function that was returned every update

-Hannah

[rob_m...@hotmail.com]

Hannah,

I'm needing to pass a parameter unique to the entity and change the entity's property based on that parameter. I've been experimenting with what you suggested, but I can't seem to get it to work.

How do I pass the "MON" parameter (which is different for each entity created) to the CallbackProperty function?

I'm sorry if I'm missing something simple here. Can you turn my example into a working example?

[rob_m...@hotmail.com]

I must be missing something simple here... but I'm sure not seeing it. Can anyone help me understand how to make this work?

[rob_m...@hotmail.com]

By the way let me separate the issues...

The code I posted here works in my development environment and on the web. It just doesn't work in Sandcastle when I include the lines with CallbackProperty. However, the ellipsoids take a long time to load. They also take a very long time to update. And I'm wondering how to improve their performance.

1) How do I get code with CallbackProperty to work in Sandcastle?
2) Is there another approach to using CallbackProperty that will improve the performance in this scenario?

Thanks,
Rob

[Matthew Amato]

Rob, I'm hoping to look at your code this weekend, but a quick glance shows that the below code is incorrect:

    material: new Cesium.CallbackProperty(getColor(MON), false),
    show: new Cesium.CallbackProperty(getVisibility(MON), false)

CallbackProperty requires a callback function (the signature is "function(time, result)".  In your case, getColor(MON) returns a value, not a function, same for getVisibility(MON).

Also, for the material, new Cesium.CallbackProperty(getColor(MON), false), should be new Cesium.ColorMaterialProperty(new Cesium.CallbackProperty(...)), since it's the color property of the material that's changing, not the material itself.

When I tweaked this in Sandcastle, everything worked (still too a while to load).  I'll post more feedback as soon as I have the time.

[rob_m...@hotmail.com]

Matthew,

Thank you for the response. I'll continue to look for some examples and see what I can figure out.

When you get a chance I would really appreciate an example that I can learn from. I kind of get the concept, but I'm struggling with how to implement it.

Thanks again,
Rob

[rob_m...@hotmail.com]

Matthew,

I updated getColor and getVisibility as you directed and modified the ellipsoid material callback. After doing this the example runs in Sandcastle (thank you!), and changing between the options in the dropdownlist is pretty quick.

However, zooming in and out is VERY slow at the points where the camera height is used to update the ellipsoid subdivisions, stackPartitions and slicePartitions.

I would LOVE some pointers on how to make this better if you have the time!

Below is the updated coded...

var viewer = new Cesium.Viewer('cesiumContainer', {
animation: false,
timeline: false,
baseLayerPicker: false,
geocoder: false,
homeButton: false,
infoBox: false,
sceneModePicker: false,
selectionIndicator: false,
navigationHelpButton: false,
scene3DOnly: true,
fullscreenButton: false

});

var VORMODE = 1;

// *****************************************************************************
function getSize() {
var cameraHeight = viewer.camera.positionCartographic.height;

var minSize = 50.0;
var maxSize = 20000.0;
var size = cameraHeight / 50.0;

if (size < minSize) {
size = minSize;
}
if (size > maxSize) {
size = maxSize;
}

return new Cesium.Cartesian3(size, size, size);
}

// *****************************************************************************

function getColor(MON) {
return function() {
switch (VORMODE) {
case 1:
return new Cesium.Color(1.0, 1.0, 0.0, 1.0);

case 2:
if (MON === 1) {
return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
}
break;

case 3:
if (MON === 0) {
return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
}
break;

case 4:
if (MON === 1) {
return new Cesium.Color(0.0, 1.0, 0.0, 1.0);
}
else {
return new Cesium.Color(1.0, 0.5, 0.0, 1.0);
}
break;
}
};
}

// *****************************************************************************
function getVisibility(MON) {

return function() {
switch (VORMODE) {
case 1:

return true;

case 2:
if (MON === 1) {

return true;
}
else {
return false;

}
break;

case 3:
if (MON === 0) {

viewer.entities.add({
position: Cesium.Cartesian3.fromDegrees(LON, LAT, 0.0),
ellipsoid: {
radii: new Cesium.CallbackProperty(getSize, false),

material: new Cesium.ColorMaterialProperty(new Cesium.CallbackProperty(getColor(MON), false)),

show: new Cesium.CallbackProperty(getVisibility(MON), false),
subdivisions: new Cesium.CallbackProperty(getSubdivisions, false),
stackPartitions: new Cesium.CallbackProperty(getPartitions, false),
slicePartitions: new Cesium.CallbackProperty(getPartitions, false)

[rob_m...@hotmail.com]

I spent some time this weekend experimenting with using EllipsoidGeometry instead of the Entity.ellipsoid. Drawing the EllipsoidGeometry is no problem, but I'm not being successful in changing the color or size of the instances once I've drawn all the ellipsoids.

I am providing a unique ID to each geometryInstance, and I'm setting the ellipsoid primitive's appearance to PerInstanceColorAppearance as well as setting releaseGeometryInstances to false. I'm then looping through the primitive ellipsoids and using getGeometryInstanceAttributes to get their attributes, but I'm getting undefined returned.

After reading more on the geometryInstances I'm wondering if I will be able to change their size or if the instances have to be recreated to change their size?

Here's the code I'm using to create the primitives...

sphere = new Cesium.Primitive({
geometryInstances: new Cesium.GeometryInstance({
geometry: Cesium.EllipsoidGeometry.createGeometry(new Cesium.EllipsoidGeometry({
radii: new Cesium.Cartesian3(300.0, 300.0, 300.0),
vertexFormat: Cesium.VertexFormat.POSITION_AND_NORMAL
})),
modelMatrix: Cesium.Matrix4.multiplyByTranslation(Cesium.Transforms.eastNorthUpToFixedFrame(
Cesium.Cartesian3.fromDegrees(LON, LAT)), new Cesium.Cartesian3(0.0, 0.0, 0.0), new Cesium.Matrix4()),
id: uniqueID,
attributes: {
color: Cesium.ColorGeometryInstanceAttribute.fromColor(new Cesium.Color(1.0, 1.0, 0.0, 1.0))
}
}),
appearance: new Cesium.PerInstanceColorAppearance(),
releaseGeometryInstances: false
});
viwer.scene.primitives.add(sphere);

[rob_m...@hotmail.com]

I've finally figured out how to update the color of my EllipsoidGeometry instances.

Is there any way to update the size of these instances? I want to change the size of the ellipsoids based on the camera height.

I've been trying to use the modelMatrix to change the size, but so far I can't figure this out.

The code I'm using to create the EllipsoidGeometry instances is...

sphere = new Cesium.Primitive({
geometryInstances: new Cesium.GeometryInstance({
geometry: Cesium.EllipsoidGeometry.createGeometry(new Cesium.EllipsoidGeometry({

radii: new Cesium.Cartesian3(10000.0, 10000.0, 10000.0),

vertexFormat: Cesium.VertexFormat.POSITION_AND_NORMAL
})),
modelMatrix: Cesium.Matrix4.multiplyByTranslation(Cesium.Transforms.eastNorthUpToFixedFrame(

Cesium.Cartesian3.fromDegrees(LON, LAT, 0.0)), new Cesium.Cartesian3(0.0, 0.0, 0.0), new Cesium.Matrix4()),

id: uniqueID,
attributes: {
color: Cesium.ColorGeometryInstanceAttribute.fromColor(new Cesium.Color(1.0, 1.0, 0.0, 1.0))
}
}),
appearance: new Cesium.PerInstanceColorAppearance(),

releaseGeometryInstances: false,
allowPicking: false
});
scene.primitives.add(sphere);

Any help would be greatly appreciated!!

[Hannah Pinkos]

Hello,

Here's a modelMatrix that adds a uniform scale to the ellipsoid:

var modelMatrix = Cesium.Matrix4.multiplyByTranslation(
    Cesium.Matrix4.multiply(Cesium.Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid),
                            Cesium.Matrix4.fromUniformScale(3), new Cesium.Matrix4()),
    new Cesium.Cartesian3(0.0, 0.0, radii.z), new Cesium.Matrix4()
);

Hope this helps!

-Hannah

[rob_m...@hotmail.com]

Hi Hannah,

Thank you for the response!

I'm trying to apply the code you provided like this...

myEllipsoid.modelMatrix = Cesium.Matrix4.multiplyByTranslation(

Cesium.Matrix4.multiply(Cesium.Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid),
Cesium.Matrix4.fromUniformScale(3), new Cesium.Matrix4()),
new Cesium.Cartesian3(0.0, 0.0, radii.z), new Cesium.Matrix4()
);

But I get "radii is not defined". Is radii the geometry radii of my ellipsoid geometry instance? And if so how do I get a reference to it?

Thanks,
Rob

[rob_m...@hotmail.com]

By the way are there tags I should put around code when posting in the forums? I see that your code has a border around it...

[Hannah Pinkos]

Whoops! Sorry, radii is a Cartesian3 that has the radius values for the ellipsoid.  Here's the code sample I was using:

var radii = new Cesium.Cartesian3(200000.0, 200000.0, 300000.0);

var positionOnEllipsoid = Cesium.Cartesian3.fromDegrees(-100.0, 40.0);
var modelMatrix = Cesium.Matrix4.multiplyByTranslation(

    Cesium.Matrix4.multiply(Cesium.Transforms.eastNorthUpToFixedFrame(positionOnEllipsoid),
                            Cesium.Matrix4.fromUniformScale(3), new Cesium.Matrix4()),
    new Cesium.Cartesian3(0.0, 0.0, radii.z), new Cesium.Matrix4()
);

var ellipsoidGeometry = new Cesium.EllipsoidGeometry({
    vertexFormat : Cesium.PerInstanceColorAppearance.VERTEX_FORMAT,
    radii : radii
});

And the code highlighting is done by the text editor google provides in the forum.  I highlight the text and click the { } button on the end of the toolbar.

Best,

Hannah

[rob_m...@hotmail.com]

Hannah,

I'm now able to size the ellipsoids using the modelMatrix! Thank you very much!!

The only issue I'm having now is that using the modelMatrix to size the ellipsoids is elevating them up above the earth's surface. These ellipsoids are supposed to sit on the globe.

How can I force these ellipsoids to stay at the earth's surface?

Thanks,
Rob

[rob_m...@hotmail.com]

Matthew,

If you do have time at some point I'd love to know if I was doing something wrong with the entity approach. From all I've read about the Entity API it seems like updating the size and color of 1000 ellipsoids shouldn't be a big deal from a performance standpoint.

My last attempt at the entity approach (after I updated the getColor and getVisiblity methods per your direction) had everything working. The performance, however, was really poor.

Thanks for any guidance...

Rob

[rob_m...@hotmail.com]

I see that the EllipsoidGraphics subdivisions, stackPartitions and slicePartitions are properties. So I'm suspicious that the performance hit is because I'm not setting these properties correctly in the CallbackProperty functions.

In order to get the material property to update correctly the ColorMaterialProperty had to be set with the CallbackProperty function.

Can someone explain to me how to properly set the subdivision, stackPartition and slicePartition properties in a CallbackProperty function? I'm not sure what property object to use.

Here's the creation of the ellipsoid entity I'm using...

cesiumViewerEntities.add({
parent: vorEntities,

position: Cesium.Cartesian3.fromDegrees(LON, LAT, 0.0),
ellipsoid: {
radii: new Cesium.CallbackProperty(getSize, false),

material: new Cesium.ColorMaterialProperty(new Cesium.CallbackProperty(getColor(MON), false)),

show: new Cesium.CallbackProperty(getVisibility(MON), false),
subdivisions: new Cesium.CallbackProperty(getSubdivisions, false)

stackPartitions: new Cesium.CallbackProperty(getPartitions, false),
slicePartitions: new Cesium.CallbackProperty(getPartitions, false)

},
MON: MON
});

[Hannah Pinkos]

Hi Rob,

Can you please paste a code sample?  Using the example I gave you, I would expect the ellipsoids to remain on the surface.

Thanks!

-Hannah

[rob_m...@hotmail.com]

Hi Hannah,

I've realized that this issue is related to using 3D terrain. Whether I use primitives or entities I can't force the ellipsoids or points onto the surface when I am using 3D terrain. Is there any way to force the ellipsoids or points to sit on the surface?

Below is a simple example for Sandcastle. If you zoom in close to the point and tilt the globe you'll see that the point is elevated. If you comment out the terrain provider then the point will be sitting on the globe.

var viewer = new Cesium.Viewer('cesiumContainer', {
animation: false,

baseLayerPicker: false,
fullscreenButton: false,

geocoder: false,
homeButton: false,
infoBox: false,
sceneModePicker: false,
selectionIndicator: false,

timeline: false,
navigationHelpButton: false,
navigationInstructionsInitiallyVisible: false,
scene3DOnly: true,
terrainProvider: new Cesium.CesiumTerrainProvider({
url: 'http://assets.agi.com/stk-terrain/world',
credit: ''
})
});

viewer.entities.add({
position : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
point : {
pixelSize : 10,
color : Cesium.Color.YELLOW
}
});

[Hannah Pinkos]

You can use the sampleTerrain to query the terrain for the positions with height.

Take a look at this example: http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=Terrain.html&label=Showcases

Look for the 'Sample Everest Terrain' function to see how sampleTerrain is used

-Hannah

[Rob Milton]

Hi Hannah,

Just wanted to follow up and say that the "sampleTerrain" method worked great!  This solved the issue with placing the objects "on the terrain".

Thanks for your help with this!

Rob

[Hannah Pinkos]

Great! Glad I was able to help =)

-Hannah