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Start/Stop AR At runtime

Hi,

 

I use vuforia in a custom rendering engine, openGl based, in Android.

My goal is to start/stop the Vuforia's engine at runtime, without stoping the 3D engien render.

But, when pausing / starting the AR, the 3D engine state change, somewhere deeper in Android lifecycle and the engine stop rendering.

I know I won't have the details of the action made during Vuforia's pause/resume, but How can I just pause Vuforia without any effect on the lifecycle of the fragment/activity ?

 

Thanks a lot :)

Regards,

Vincent.