Render Mirror

Hey,
Im trying to create mirror in my game. Everyone uses script from http://wiki.unity3d.com/index.php/MirrorReflection4 but I find it very difficult to understand. Also it doesn't render infinite recursion when mirrors are facing each other.
Also I cant find any good tutorial how mirrors work. Has anyone any clues or deep understanding how it works?
Im trying the approach with second camera rendering to a render texture.

 

I've the same problem here.
I'm using unity 2017.3.1.
The shader and script from that link don't work. Any official tutorial about this very common thread?

 

A second camera reflected in the mirror is the usual way. Do note that you should clip pixels in the reflection that fall behind the mirror. And you should reverse the face culling. (Or, as I do, also flip the projection matrix upside down and map the resulting RenderTexture upside down.)

Doing infinite recursion this way would require an infinite amount of time, so that won't work.