re: freezing the model

Here a description of one way to accomplish that - https://ar.qualcomm.at/content/how-disable-pose-updates-rendered-model-aka-freezing-model-disabling-tracking

That example is for Android, but could easily be applied to iOS as well.

Hi, i'm new user of this SDK then maybe my answer can not be the best way you go find.

in your case i just use a variable (can be global) to save the pose of tracker every frame. Then if the tracker is visible, change the value of this variable pose you create, else just stay the same and always use this variable to manipulate the matrix of the object.

Hope i can help u, sorry the english, i'm Brazilian. =] 

Hi ,

Thanks for the quick response..

So can I point at stones and display teapot and when I am not tracking stones anymore can I still have that teapot at the same position with the help of last known pose? If yes how can I do this?

Thanks..

If you want to do tracking witout any marker (markerless), then this is currently impossible. Please make a feature request for markerless tracking (SLAM) in the wish list thread. 

If you simply want to display the last known pose when the marker was last visible, modify the code wich removes the AR content so it never removes it.