Thanks.

Issue solved.

Are you using Unity 3.5?

If so, that's a known issue, please see..

http://ar.qualcomm.at/node/2001747

You'll need to add..

if (GUI.changed)
{
// Let Unity know that there is new data for serialization.
EditorUtility.SetDirty(tb);
}

to OnInspectorGUI in TrackerEditor.cs

Hi

When i am putting my option to "none" or "user" it will automatically go back to "auto" after i make a build.

Even after pressing play button in Unity editor my AR camera setting goes back to "auto".

Am i missing something here?

No, there shouldn't be a performance difference between the different world center modes.

- Kim

Hello Kim,

thanks a lot for your help, I've now changed the parameter to NONE (although USER also worked) and it works like a charm :-)
Just a small tech question: if my scene contains let's say over 10 trackers,
will there be any potential performance issues by using the World Center to NONE or USER instead of AUTO (e.g. takes a little bit more time to find the initial tracker and compute the position of all others) ?

This is probably an artifact of how the tracker arranges the objects in the scene. Is your light bound to any of the trackables or the camera? If not, you might experience this drift, as the camera and trackable objects are moved in relation to each other over time, while the light stays stationary.

This is the purpose of the World Center Mode setting on the ARCamera:

AUTO:
The first trackable found is used to move the camera (i.e. the trackable stays still in the scene while the camera moves around it). All other trackables are then moved in relation to the camera.

USER:
Same as above, but you can select a single trackable to act as the world center, and it never moves in the scene.

NONE:
The camera never moves, instead all the trackables move around it.

With AUTO, the trackables will drift in world space over time as they are lost and found in different combinations. With USER one of your trackables will be the world center and will be anchored in world space. With NONE the trackables will all move around a fixed camera. In your case I might suggest using USER, especially if one of your trackables is the predominate one.

You could also play around with parenting the light to the trackables, reparenting to a visible trackable whenever necessary...

- Kim