my tap gesture only work on one model - Augmented Reality

Hi everyone! I'm totally new to programming and trying to learn AR by working on a simple AR app.

Right now I have a tap gesture for loading my cat model [link to my code](re-tap to relocate the cat), however, I want to add a button for confirm my cat model's position and then make my tap function only work for my other models (ball/heart/fish models).

I have no idea how to make that happened. Can anyone give me some guide please??

my tap gesture only work on one model - Augmented Reality
 
 
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