Hi everyone,
This is CF3 Systems.
I’ve released CF3 Interaction Authority, a UE5 multiplayer interaction system focused on server authoritative validation, replicated state, and late-join-safe interaction examples.
The goal is to solve a common multiplayer problem:
client sends interaction intent
server validates the target
server applies the result
replicated state rebuilds correctly for other clients and late joiners
Included demo examples:
replicated door interaction
replicated pickup interaction
persistent button interaction
momentary button interaction
optional interaction prompt UI
range and line-of-sight validation
The system is designed so the authority logic stays separate from the demo UI and player setup.
Proof video:
Fab product page:
Documentation:
This thread is for product questions, setup help, feedback, and future update notes.
Feedback on the proof video, documentation, or multiplayer setup flow would be appreciated.