Wikitude

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".

@Piyush, I havent tried this in Unity so not sure if it will work there. 

What I had to do in the JS-PhoneGap version is to have a 2D multi-object tracker look for fake name tags (which act like QR codes), which then triggers and load the correct 3D Object Trackers. To figure out when a user "wants" to look at a new 3D target, I just use a basic timeout in trackable.onObjectLoss. 

Here is the general steps:

1. Initialize a 2D collectionResource
2. Initialize a 3D collectionResource
3. Create a 2D multi object tracker that scans for multiple images at a time - this scans for a fake name tag of objects (like a QR code, but nicer looking)
4. When it recognizes a tag, load a corresponding 3D tracker and assets. Also pause the 2D tracker
5. 3Dtracker onObjectLoss -> after 3000 ms destroy the 3D tracker and resume 2D tracking

Hi, I am new to AR and exploring wikitude. I am trying to track multiple objects, but not at once. My use case is that I wish to track different objects kept in different rooms, so no two objects will be in a single frame. I have uploaded the images of the objects in the same project but different object targets and downloaded the wto file. Now to proceed from here, I have a object tracker in my unity project which has trackable as child. I have set the path of wto file in my object tracker. How to I go from here to find which object was recognized? I want to load different prefabs upon different object recognized. So for example, if object 1 is recognized, I want to load prefab 1. Then when I move to second object, it should recognize object 2 and load prefab 2.

can you please give suggestion how to do multiple object detection within a same scene 

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.

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?

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 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?

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

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!