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Detect Camera's relative position to a box collider like in Holograms App
In the built in Holograms app, I found that the "menu" ("adjust" button and "delete" button) will show up at different side of the box collider according to user's relative position to the Holograms, so as user goes to the other side of the Hologram, the menu also goes to the other side of the Hologram.
I am trying to implement this functionality in Unity. But I cannot figure out the logic behind to decide where the menu should shows up.