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Issue Trackable Found, when Vuforia is activated after being deactivated

April 19, 2018 - 1:23am #1

Hi,

we found a bug in Unity 2017.3 and upwards using Vuforia 7.x.

 

We reproduced it with new and clean Unity Projects, which only used Vuforia for Android and iOS and the Vuforia Examples.

 

1. Setup a new scene

2. Add Vuforia Camera

3. Add ImageTarget (for exampe Astronaut or Oxygen)

4. Start the playback mode

5. Scan the Target

6. Debug Log shows "Trackable xxx found"

7. Disable the VuforiaBehaviour while the target is being tracked

8. Log shows "StopVuforia" and "Trackable xxx lost"

9. Move the camera away from the target or hide the target, however, make it not visible for the camera

10. Enable the VuforiaBehaviour

11. Log shows "StartVuforia" and "Trackable xxx found" and immediately "Trackable xxx lost"

 

Point 11 does not happen always, but very often. And that´s the problem and bug. The target is not been seen, but is fired as tracked. And if this triggers something in your app, this is not desired to happen, when the camera is not pointed at the target at this moment.

 

The same setup done with Unity 2017.2 and Vuforia 6.5.x does not lead to this error. Here point 11 always finishes with "StartVuforia" only.

 

We reproduced this with Apps using different Unity/Vuforia Versions and with this "Vuforia Only Dummy Projects" like explained in this example. Unity Editor and Device.

 

Will there be a fix soon?

 

Greetings,

 

Martin from KIDS

Issue Trackable Found, when Vuforia is activated after being deactivated

July 3, 2019 - 10:08am #4

Hello,

The tracking state can be updated for each camera frame. Thus, "noise" from trackable status changes can occur.

Can you please describe why this makes Vuforia Engine unusable? For the Ground Plane feature in our Core Samples, we demonstrate a use case where trackable status results are filtered to help with the increased toggling UX elements that key on these values.

Thanks,

Vuforia Engine Support

Issue Trackable Found, when Vuforia is activated after being deactivated

July 3, 2019 - 5:20am #3

Same issue here

For me that make almost vuforia unusable .. 

 

 

Issue Trackable Found, when Vuforia is activated after being deactivated

April 11, 2019 - 1:55am #2

Facing the exact same bug with Unity 2018.2.9f1 and Vuforia 8.0.10. It is quite frustrating.

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