It is for a architecture project?
Maybe you can try this…
I don’t like this solution because i makeing a game and the performance drops a lot…
but maybe for a architecture project it does not matter…
Anyway in a mirror you will have not a perfect reflection (like a real mirror)
Not if you don’t have a mega-super graphics cart… even so maybe you will have not a perfect reflection.
Real-time rendering has many limitations and reflections are one of them.