ZDoom

I had to clip out the 'int side' part of it though in an effort to help minimize the impact on the engine, but there are functions already out there which you can use to get it, I think.

Oh well, just realized, there is already the same feature realised in code submissions forum.

virtual bool CanCrossLine (Line l, int side)

It would be nice to have virtual function:

[code]virtual bool CanCrossLine (Line l, int side)[/code]
for actors, that would allow to set custom rules if said actor can cross a specific line.

This idea originally came from a need to have a customizable generalization of the +CantLeaveFloorPic flag, to prevent selected actors to enter water (or different way forbidden) sectors.