I am developing an application which will have a very large image target (at least 2 feet tall and a foot wide) and I want to enable the tracking to work at extremely close ranges and not lose the tracker.
As such, I broke the target image down into 8 fragments and made each one an image target, arranged them in Unity so that they are all in their proper respective places, but I've noticed a slight issue:
If the first target detected isn't the correct one (top-left most?) then the 3D model appears offset. I have determined that this is due to the WorldCenterMode setting being set to "first target."
However, my attempts at using any of the other modes have rendered the application non-operational, where it (appears) to never detect the targets at all, and certainly doesn't track them.
I made a recording, available here: http://youtu.be/iLidm5vdD3Q
You can see that it works very well in the "first target" mode with the exception of being offset if the centered target is the wrong one, but in the other two modes it doesn't work at all. You can hear my coworkers talking about it (our designer was showing it off to a couple of other folks just as I was setting up to record the issue).