The crane has a lot of complexity and intricate parts that would be difficult to capture. See the "Supported Objects" section of the Object Reco guide for more info about ideal object targets:

https://developer.vuforia.com/library/articles/Training/Object-Recognition

Also note that your object should be placed entirely in the upper right cuadrant not only the base of it and the background should be a plain color one (e.g. white or gray)

Thank you for your reply, but how should I place my object in the upper right cudrant if its size exceeds this cudrant by far (see schreenshot) ?

Place the object so everything is in that quadrant. It does not matter if the left most part of the object is not touching the ground.

Hi,

First of all think about printing the scan pattern to an A3 paper sheet. You have to scale the content by 137% later on.

I had some figures that also exceeded the upper right quadrant. I recognized that features get recorded, which exceed the upper and the right border of the pattern.

Me too, getting issue when scanning the big object. It get lost easiy when you move away from scanning target.

How big is the size of the scanned objevct that the app still work? 

Thanks

You can scan big objects but they have to be featured, if the part of the object you are scanning does not have enough points and the target is not anymore in view you will lose your object easily in the capture app. If the object is created with just a few points it will not be a strong target in a object reco app.

As a rule of thumb (from my experience so far):
An object with the dimensions 14cm x 5cm x 4cm (like a bigger action figure) needs approximately 150 feature points from one site to achive good tracking results. I had a figure which had only 75 features in the front view - this was not enough for a stable tracking.

Have a look at this thread: https://developer.vuforia.com/forum/object-recognition/improve-initial-recognition

Thank you guys. I just give it a try on a big objects such as open computer case, it works great as long as it have lot of features. 

Hi 

Did u get any solution for scanning bigger object???

Could you supply the object scanning target artwork as a vector image so we can try printing it off at a larger scale? The jpg that is linked on the website loses quality if we try to go much higher than A2 with it. 

The maximum recommended print size for the object scanning target is A3. Apologies, but we cannot support formats for printing larger sizes at this time.

I get trouble wen my app only work with the 1st object target it track, if I re-run my app then track other object target, it works but not with the remain. Anyone please help me fix it to work with all object target be tracked! thank you so much!

quyetnguyen wrote:

I get trouble wen my app only work with the 1st object target it track, if I re-run my app then track other object target, it works but not with the remain. Anyone please help me fix it to work with all object target be tracked! thank you so much!

check out this thread: https://developer.vuforia.com/forum/object-recognition/only-track-object-target-tracked-first-time