How gltf work with czml?

CesiumJS
1

Hi, All,
I'm going to let the spacecraft in gltf demo fly on a track, which a czml defined?
Another question, can I create a czml server to give the real time position for this craft? Only example or document here?

Thanks,
Shawn

2

Shawn,

We did this for the Cygnus app. In the gltf branch, there is a new DynamicModel for 3D models. Later, CZML will also be able to drive animating individual parts of the model. Keep an eye on the glTF roadmap.

I don’t have any examples handy but Matt might.

Patrick

3

Hi, Patrick,
I checked out Cygnus app. The source code is obfuscated. Matt, do you have simple example for this?

Thanks,
Shawn

4

Actually, the gltf branch does have a demo, in cesium\Apps\CesiumViewer2\Gallery\model\modelDemo.czml.

–Ed.

{
“id”:"/Application/STK/Scenario/LoopingFighterWithWingman/Aircraft/Leader",

"availability":"2010-12-08T16:59:30Z/2010-12-08T17:22:26.7907302876993Z",
"model":{
 "uri":{
   "gltf":"duck/duck.json"
 },
 "scale":1.0,

 "show":true
},
"label":{
5

Hi,Ed,
Czml and gltf worked. lol. Thanks a lot. But, one issue here. When I load other model to replace duck. The model's heading and spinning cannot be controlled. It doesn't head to the moving direction. How to set these two things?

Thanks
Shawn

6

That’s the “orientation” parameter in CZML. Our current exporters only write it out if something needs to be oriented correctly, like a sensor cone or an ellipsoid volume. It is not written for points, billboards, labels, etc. This has been causing me a headache recently, and last night I resorted to attaching a sensor cone to an object, and copy-and-pasting the resulting orientation to the model. Not a long-term solution obviously.

Once models become official, the exporters will need to write their orientations along with the object.

–Ed.

7

Ed, if you’re using the STK Components CesiumPacketGenerator, you can force orientation to be written (even if it doesn’t appear to be needed) by adding this:

CesiumPacketGenerator packetGenerator = …;

packetGenerator.CesiumSources.Add(OrientationAxesCesiumSource.Instance);

Kevin

8

Shall I just adjust the orientation of model in a editor, like 3Dmax. Then convert to gltf format. Maybe that's a quick solution.

9

Hi,Kevin,How can I find STK Components CesiumPacketGenerator?

在 2013年12月12日星期四UTC+8下午10时50分20秒，Kevin Ring写道：

10

Hi,

If you’re an STK Components customer, contact customer support or your salesperson and tell them you would like to try out the pre-release Cesium library.

Kevin

11

Is the czml with gltf model can only rendring in the gltf branch

How can I add this function to b26 or the later version?

在 2014年4月8日星期二UTC+8上午6时08分52秒，Kevin Ring写道：