Fixed Image Tracker flips upside down 3D element - Bug

Spark AR
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#1

Hi Popul-AR friends,

I have found a bug with Fixed Image Tracker that flips upside down my 3D element associated with it. But can’t replicate it to understand why it happens. I think maybe is because of the inclination the phone has… but that shouldn’t happen.

I leave you a video, so you can understand better.

Thanks!

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#2

That is really strange. I would report it to the spark team, using the “report problem” option in the menu.

As a workaround, maybe you could try checking the worldTransform.rotationZ of the model, and if it’s upside down, then you can flip it.

#3

Thanks @josh_beckwith,

Do you know if this is the Module of the FixedTargetTracking: https://sparkar.facebook.com/ar-studio/learn/reference/classes/scenemodule.targettracker

So I can try if the target is being tracked what orientation initially has… because I need to do this at the start, before the animation of the object starts jumping…

#4

Yeah, you should be able to use that isTracking boolean. I’ve noticed that sometimes transforms take a few frames to actually apply. To avoid the jank, you might need to use a delay to wait for the corrective transform to apply

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