Focus camera on object

CesiumJS
1

I have a question about using the “Focus camera on object” widget on an object in a Cesium application. The behavior is seen when the object is a trajectory-type object not attached to the ground. It appears the viewer is fixed just to the port side of the object.

An example of this behavior is in the “3D Models” Sandcastle example. Zoom in on the Aircraft and you will see the viewer is looking at the port nacelle instead of the center of the airplane. Choose the Ground Vehicle and zoom in on it and it appears to be the center of the vehicle. What is the difference and is there a way to attach the viewer to the center?

2

You’re talking about using the trackedEntity property of the viewer, right?

I initially assumed it was just a matter of the geometry itself being offset from its origin, but you can verify this isn’t true in this modified Sandcastle which places a red sphere at the origin of each model. The hot air balloon for example also has the camera offset from its model origin.

This may be a function of how CesiumJS computes the bounding sphere for glTF models, which can be seen here: https://github.com/CesiumGS/cesium/blob/638c6ebffe86a17637acc8dc5c223f404131f993/Source/Scene/ModelUtility.js#L192

Are you seeing a significant difference in the model origin and the “camera focus point” in your models?

3

Yes I am seeing a decent difference in the origin and camera focus point. I have an example file I can share but I can’t upload a file since this is a new account.

4

I am including some czml output where you can see the effect since I can’t attach the file. It occurs at Jun 16 2020 17:36:51
Here is the czml:
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“name”:“FOO”,
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}
}
]

5

Thanks for sharing. I can’t run that since the forum replaces the straight quotes with opening/closing quotes. I’m looking into why it’s not allowing you to attach the file - can you share the screenshot/text of the error you’re seeing when you try to attach it?

Otherwise you can wrap this in code blocks, or upload it Cesium ion (https://cesium.com/ion/) and share a Sandcastle link.

6

Sorry here is the Sandcastle link. I didn’t realize I could share that way. Let me know if this works.

7

Generally if you have other objects on the entity (like a model, as well as a polyline and a label) that will offset the origin to be the combined center of all those, so that’s where the issue may be.

One workaround I’ve done in the past is simply to create a new entity that’s a single point or a sphere, place that relative to the model wherever I want the focus to be, and use a CallbackProperty to keep it moving with the original model. That way you can control exactly where the camera’s focus is. Or try removing the labels/lines and put those in a separate entity so they don’t alter the camera focus.

1 Like
8

Thank you for your help Omar. I had a similar problem and your suggestion of adding a separate entity ended up not change the camera’s orientation when tracking it!

9

I can’t give you a specific solution for your exact problem, but I can hopefully point you to some directions of things to try and maybe that will help.

For czml I use something like this:

//  // .add(
  //   CzmlDataSource.load("./customCZML/CameraPath1.czml")
//   )
//   .then((ds) => {
//     const tourpath = ds.entities.getById("Aircraft/CameraPath1");
//     viewer.zoomTo(tourpath);
//     viewer.selectedEntity = tourpath;
//     setTimeout(() => {
//       viewer.camera.rotateDown(0.55);
//       viewer.camera.rotateLeft(0.5);
//     }, 1500);
//   });

and for entity I think I would try and use viewFrom, but I don’t have as much experience with entity api.

The forum has some topics on viewFrom, I’ve only seen it used in a few cases and couldn’t find an example I recalled seeing recently, sorry.