I’m looking for a function which actually uses something like the Unity scopes, but then also for bandwidth saving for Photon. So I am not talking about groups in Photon as these do not save any bandwidth!
Any idea / example code how this would be done?
This article describes a clever use of PUN’s Interest Groups:
http://www.m2h.nl/network-traffic-culling
The solution is not directly built-in to PUN, so you need to implement it accordingly.
See this article that describes the same approach (racing game with 16 players):
http://blog.exitgames.com/2014/12/radial-g-devstory/