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How to increase the number of targets in an object collection

Is it possible to increase the number of current targets in an object collection?


After adding 10 object target movies, we received an error "You have reached the maximum of allowed targets in the current target collection".


Hello Yetzer,

We strongly recommend that when you create a .wto file, you should not add more than 10 object targets. Otherwise, this could greatly influence the performance of your app.

Thanks
Eva

 

Hi,

i have 3 targets in a single .WTO. How can I use these 3 targets  in the same way as multiple target image recognition (we are using unity3D)? Is it possible?


Thank you!

Hello Federica,

Object Recognition does not work simultaneously like 'Multiple Image Recognition'. You provide the .wto file that contains these objects and then you start tracking each object. It will work if you track each object separately but not all together.

Thanks
Eva

 

Thank you Eva!

First question: we can have more trackable under an objectTracker ?


Another question: I've already imported a 3d Object (.fbx) in Unity3D: now i need to place this 3d object in a determinatig position of the scene (I'm using "Tracking Object" as an example): I saw that i can  rotate e scale the object directly from my 3D software, but I can not move it in space, so that it is perfectly positioned above the framed object . Do I have to do it from unity (within the asset, or in the trackable) or from the outside? Do you have an example?


Thank you



Hello Federica,

I apologize for the late response. I am afraid though that I do not exactly understand your first question. If you want to have more than one objects in the video you are recording and that you will later use to convert it to your .wto file then, yes this is possible. You can create a .wto file with up to 10 objects there.

Regarding your second question, you can have the model either placed directly as a child GameObject for the Trackable GameObject and position it locally, or assign a prefab with your model in the Drawable field of the Object Trackable component. You can have a position set for that prefab. Please see the Object Tracking scene from our sample project.

 

Thanks

Eva

Hi Wikitude, 


Can you post an example of tracking multiple objects? 


I have two objects in my WTO file, and instantiated two AR.objectTrackable, one for each. However, the app seems to ever only recognize one object. What should I do?

Hi Andy,


You should use the exact same approach that you are using when recognising multiple images. So if you have a look at our example here for multiple image targets, you do exactly the same but you just replace the .wtc file with the .wto file and instead of AR.ImageTrackers you define AR.ObjectTracker.


Thanks

Eva

Hi Eva,


I've tried using the code below. It seems to only ever detect one of my objects. 

I've downloaded my WTO file from this project in my wikitude studio: 5ad8bb0a4a8cdf1aa9074a4f

this.targetCollectionResource = new AR.TargetCollectionResource("assets/myWTOfile.wto", {});

this.tracker = new AR.ObjectTracker(this.targetCollectionResource, {
    maximumNumberOfConcurrentlyTrackableTargets: 5, // a maximum of 5 targets can be tracked simultaneously
    extendedRangeRecognition: AR.CONST.IMAGE_RECOGNITION_RANGE_EXTENSION.OFF,
    onTargetsLoaded : ()=>{},
    onError         : (errorMessage)=>{ alert(errorMessage)}
});

this.objectTrackable = new AR.ObjectTrackable(this.tracker, "*", {
    drawables: {
        cam: []
    },
    onObjectRecognized: function (targetName) {
         alert(targetName + ' found');
    },
    onObjectLost: function (targetName) { 
        alert(targetName + ' lost') 
    }, 
    onError: function(errorMessage) {
        alert(errorMessage);
    }
});

  Thanks Eva.


 

 

Hi, 


I've modified the code for multiple image targets, however the multitracking always only detects one object. What else do I need to do to get multiple tracking to work?

Hello Andy,


I deeply apologize for the inconvenience but there has been a misunderstanding from my side. Multiple object recognition is possible but not at once. So there is nothing wrong at your code, this is the Wikitude SDK standard behavior. Again, I am sorry for the misunderstanding.


Thanks

Eva

Hi Eva,


No worries. Thanks for double checking.

I think I will pursue using "2D detection that then triggers a specific object tracker" method to get a similar effect. 


Hope multi object tracking comes soon.

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