Good morning Pablo,
I'm afraid the reference for the snap to screen feature for the AR.InstantTrackable is missing for some reason. But the behaviour should be identical to AR.ImageDrawables, meaning you can follow the corresponding sample.
reference - this is the reference for the AR.ImageTrackable, but AR.InstantTrackable does have the same snap to screen related properties
For complete sample code please check the snap to screen sample of the 3D models section.
I need to know how to force an 3D Model animation to snap to screen, i'm using instant tracking because the main functionality is display an animation without image tracking.
Is that possible?