Unity (C#) - How to check if an object is in camera view?

Question

C++ / C#

How to check if an object is in the camera's field of view? The game is 2D, what are the ways to check this?

Answer 1

so there is also a built-in
https://docs.unity3d.com/ScriptReference/MonoBehav...
there is really an important point about "ANY camera", but usually this does not interfere)

Answer 2

https://docs.unity3d.com/ScriptReference/GeometryU...