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Image Target and Positional Tracking

May 17, 2018 - 3:35am #4

Is the Positional Tracking compatible with Image Targets?

When i set Device Tracker with Rotational Tracking, Image Targets work correctly (iPhone SE), but position is not tracking. When Device Tracker is set to Positional Tracking, position is tracking but Image Targets can't be detected.

Any suggestion?

Image Target and Positional Tracking

May 17, 2018 - 1:51pm #3

Hello tonimarquez84,

Positional Tracking is not currently available for Image Targets, but it will be in a future release. More information on this will come in the future. Keep an eye on the developer portal and forums.


Vuforia Support

Image Target and Positional Tracking

May 18, 2018 - 12:27am #2

Thank you Strasza for your fast answer! This post can be closed.

Image Target and Positional Tracking

September 28, 2018 - 7:25am #1

Hi Vuforia Support,

Can you help me understand something? My current interpretation is that there is an option in the Device Tracker section called Fusion Mode, where we can set "Optimize for Image Targets and VuMarks", but that according to this reply, the POSITIONAL tracking does not actually work in conjunction with Image Targets? That would be a bit strange, so perhaps I am misunderstanding something.

In any event, the goal of our (enterprise-level) app is to use Positional tracking on a Surface Pro 4 tablet, where an image target is used for scale initialization, since we understand that automatic scale really only works on ARCore/ARKit devices. We want to visualize a structure that is about 1.6 meters high, from about 3 to 5 meters away.

Unity version is 2018.2.10f1, Vuforia version (per the Configuration panel in the Editor) is 7.5.20.

I have set the World Center mode on the ARCamera to DEVICE. I have commented out OnTrackingLost() in DefaultTrackableEventHandler.OnTrackableStateChanged() in case the position tracking does work, but it is just not visible because the augmentation gets hidden when the marker goes out of view. When I then run the app, it can be seen that the augmentation is indeed not registered in space anymore when the image target goes out of view. Instead it seem to 'stick to the screen', for lack of a better description.

Do you know of a fix?

If not, what would be the recommended way to provide scale-accurate (up to a few % of scale error is allowed) augmentations of a large size, in unknown environments, on the Surface Pro 4?

Thanks from TWNKLS, users of Vuforia since QCAR 1.0 beta :)

PS: we cannot replicate the 2x to 3x improved larger distance for initialization that is mentioned in the release notes for version 7.5, at least not on this device when the Camera Device Mode is MODE_DEFAULT. The Image Target still needs to fill something like 25 to 30% of the image for initialization. However, when the Device Mode is set to MODE_OPTIMIZE_QUALITY, the initialization distance is indeed better than before. 

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