Hi - I'm just getting started with ARKit and have following questions for people who are already ahead a. I have to place some 3D characters on a plane. When my app starts how long do I keep tracking? When should I stop tracking? As I understand the first plane info might not be perfect and ARKit updates plane info as it finds new info, so Im not sure when to stop tracking the plane? b. If I want to let users place characters on their hand I'll have to use feature points tracking for it right? c. I want my characters limited to the plane boundaries, how can I know if I have reached the plane boundary? Yogee.