@Marjan which version of unity you're running it on? I was having some strange behaviors on 4.1 + Xcode5 earlier today (Extended mode enabled but clearly not working on the ipad, while it did on the editor i need to test further tomorrow).

The target's orientation is significant to the registration of the augmentation - so if you rotate it, the augmentation will rotate as well. Also changing targets in the scene is going to affect the extended tracking feature as well. 

Extended tracking is best suited to stable scenes. If you need to manipulate the targets, turn off the extended tracking - you can disable and re-enable extended tracking programmatically when changing targets. 

If you can give us an idea of your requirements, we can advise on how to best accomplish them. 

Also check online for free screen recording software that willl enable you to capture your scene from Vuforia's Play Mode in Unity.

No, i don´t know how to rcord this in action.

But i figured this:

1. Set Up you scene in Untity as usual, enable extended.

2. now, run this, everything will be fine fist.

3. Best you have your marker in a table. now, walk araund the table to the opposite site, whle extended is the mode. So stay a bit far of the marker.

As soon as i am on the other side, my scene flips. Or i don´t know if it flips or goes to some angle.

Well as i read, the background should not change, but if i go around it or turn the marker image, well, than this might mean change.

My testers here are all wild, they exchange marker images, turn them around, move around, they run around it and this leads to the described issue.

Extended works well for me if i stay at position and move the iPad left/right up/down. But walking around it is no good.

I remember there is some other Extenden Mode (forgot what its name is right now) but in unity with the delevered scripts, there is only extend or not. So i don´t know if the other mode would help.

Can you share a video of the 180 degrees rotation issue ? That would help.

So, to get this clear...

First i thought thy gyroskope is somehow invoked.

But now i think you are somehow capturing the videoimage to create something like a bigger/growing marker image?

If so, the setup (table or wall) would benefit from heigh contrast patterns? A completly white table would be bad?

Or does this work in a different way?

Just wondering, because we have an issue like this:

A. Marker is found, Objects are drawn, good

B. Move away from the marker, tracking switches to extended, all is good

C. Move closer to the marker again... All of a sudden the Objects are all rotated by 180 degrees around Vector up. Thus, as if the we approch it from the other side of the table.

And i have no idea how to avoid this.

Yes - Extended Tracking utilizes the reference target as an anchor, and enables you to capture additional features of the environment to maintain a coordinate reference away from the target itself. So you can move the camera away from the target and still maintain stable and consistent positioning and trajectory for other targets and virtual objects.

I

Okay, having read the docs and toyed with 2.8 samples a bit, I'm loving this.  I'm a little confused about more advanced possible use cases.  For example, the docs say that while in persistent mode: "if an additional target is detected and tracked, this is appended to all existing targets that are being tracked".  Does this mean that Vuforia 2.8 now do things that would have required the UCS code until now?

AlessandroB wrote:

A good starting point is the developer guide:

https://developer.vuforia.com/resources/dev-guide/extended-tracking

Ah - I'm fairly certain that page wasn't yet linked off the developer.vuforia.com landing page when I asked the question.  Thank you.

A good starting point is the developer guide:

https://developer.vuforia.com/resources/dev-guide/extended-tracking

All comments are then welcome.