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Unable to recognize multiple trackables not simultaneously

July 11, 2012 - 3:20am #1

Hi everybody,

I'm a newbie playing few weeks with Vuforia for iOS. I slightly modified ImageTarget example to play video instead 3D objects using a Queue that stores each video frame and renderFrameQCar method in EAGLView.mm binds 25 frames per second.

My problem, instead, relies on recognizing different trackables. In ImageTargetsAppDelegate's applicationdidFinishLaunchingWithOptions: I added this

[qUtils addTargetName:@"page_1" atPath:@"page_1.xml"];

[qUtils addTargetName:@"page_2" atPath:@"page_2.xml"];

But only the first one (page_1) get recognized (the default as they say). If I swap those two lines of code than only the second page gets recognized.

The problem is that in renderFrameQCar's for cycle:

state.getNumActiveTrackables();

returns 0 while capturing the second trackable and 1 while capturing the first. Can anyone could figure out why?

I didn't even understood which is the method that actually recognizes the trackable because I couldn't find any. It would be great to have some more infos about writing an iOS program from scratch that uses Vuforia Smile.

 

Thanks for anyone's time.

Cheers.

 

nodelay
Joined:
April 24, 2012
Posts: 8
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Unable to recognize multiple trackables not simultaneously

July 12, 2012 - 3:59am #7

Great - glad to be of help :)

NalinS
Joined:
May 21, 2012
Posts: 2989
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Unable to recognize multiple trackables not simultaneously

July 11, 2012 - 7:51am #6

NalinS wrote:

Hi nodelay

In that case can I suggest you look at the video playback sample we posted up:

https://ar.qualcomm.at/content/video-playback-sample-app-posted

https://ar.qualcomm.at/content/video-playback-sample-guidelines

Here it shows two simultaneous image targets being recognised and you can press play on either video that is being overlayed.

This should be a better starting point..

 

HTH

N

 

 

Oh Lord! 

This is such a beautiful news. Thanks, you really save my day.

I downloaded the files, compiled and everything is working properly. Thanks, this is exactly what I was looking at. 

nodelay
Joined:
April 24, 2012
Posts: 8
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Unable to recognize multiple trackables not simultaneously

July 11, 2012 - 7:05am #5

Actually, looking at your code again you can only have one active dataset at a time :)

This is the problem...

What you need to do is to put all the images you want to track into a single dataset, and then set #simultaneousTargets and it should work...

 

HTH

N

 

NalinS
Joined:
May 21, 2012
Posts: 2989
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Unable to recognize multiple trackables not simultaneously

July 11, 2012 - 7:00am #4

Hi nodelay

In that case can I suggest you look at the video playback sample we posted up:

https://ar.qualcomm.at/content/video-playback-sample-app-posted

https://ar.qualcomm.at/content/video-playback-sample-guidelines

Here it shows two simultaneous image targets being recognised and you can press play on either video that is being overlayed.

This should be a better starting point..

 

HTH

N

 

NalinS
Joined:
May 21, 2012
Posts: 2989
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Unable to recognize multiple trackables not simultaneously

July 11, 2012 - 5:51am #3

NalinS wrote:

Hi nodelay

In EAGLView.mm have you tried setting the following:

QCAR::setHint(QCAR::HINT_MAX_SIMULTANEOUS_IMAGE_TARGETS, 2);

...in the PostInitQCAR function

HTH

 

N

 

 

Yeah I already did, but nothing happened, any other hints?

Thanks anyway

nodelay
Joined:
April 24, 2012
Posts: 8
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Unable to recognize multiple trackables not simultaneously

July 11, 2012 - 3:56am #2

Hi nodelay

In EAGLView.mm have you tried setting the following:

QCAR::setHint(QCAR::HINT_MAX_SIMULTANEOUS_IMAGE_TARGETS, 2);

...in the PostInitQCAR function

HTH

 

N

 

NalinS
Joined:
May 21, 2012
Posts: 2989
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