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What is the best solution

February 5, 2013 - 5:49am #1


I want to make an application to show a real size car with an ipad.

I want to have a trackable on the floor and and the wall, that's why I'm using multi target.

I want to be at very close distance to see details on the car. But I also want to be far to see the entire car.

What is the best solution multi target ? One target ?

I'm trying a very complex tagret (1 meter * 1 meter), and the tracking results are not as best as a small target. Is the complexity of the target improve the tracking performance ?


thank you

What is the best solution

February 5, 2013 - 9:53am #5

Hi, a 5-star rating (as opposed to 3-star) would likely improve the situation, so it is definitely worth trying

(for a quick test, you could use chips.jpg and stones.jpg targets that are available with our samples; I believe stones only has 4 star, while chips has 5 stars, but in any case they are both very good targets).

Another thing you may want to try is to change the camera mode to MODE_OPTIMIZE_QUALITY (as opposed to MODE_DEFAULT); in Unity this parameter can be set through the Inspector in QCARBehaviour (see Camera Device Mode Settings box)

Last thing: as you also say (device loosing focus), your issue seems pretty much related to the ability of the camera to keep focus on the targets;

you may want to try changing the FocusMode for your camera, and test the available options to see which ones yields the best results:

to change the FocusMode, you can use this API:


What is the best solution

February 5, 2013 - 9:42am #4

thank you for your answer.

My target have 3 stars. Sometimes, my ipad seems loose the focus. 

When I'm going the floor to the wall quickly, I have the same problem, I loose the focus and my 3D model is hidden during 1 second. 

With 5 stars marker, is that problem disappears ?

What is the best solution

February 5, 2013 - 7:55am #3

To complement the MT, for close perspectives, you can use local ImageTargets and other MultiTargets. For these, you wouldn't need to render the entire car model, simply the elements that should be apparent from that perspective, and you would align these models with the larger model's position.

What is the best solution

February 5, 2013 - 6:27am #2

Hi, Multi-Target sounds like a good solution for your use case (better than using a single target), because it allows you to keep consistent tracking regardless of whether your camera is mainly facing the wall or the floor (i.e. at some viewing angles Vuforia will be able to track the wall target, while at other angles it will track the floor target...).

If performance are not satisfcatory, this could depend on the target quality (star-rating): what rating do you get from the Target Manager ?




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