Hi, Oh well I mirrored the map and have hit the too many t-junctions problem in VBSP (rather than, as I would have expected VRAD). As I understand things the error is due to there being too many func_detail brushes touching world geometry. I have a lot of stairs and, as much of the map is old mines the pit props are also func_details (touching world brush walls). At present the stairs are just driven into walls (no holding rails) so I'm guessing that each step is causing junctions. If I add funct_detail rails will this reduce the t-junctions, or make it worse? I guess I could switch the walls to power 2 displacements? Or would this cause excessive vis leaves where the player cannot actually go/see? Or should I make func_lod rails? Any thoughts as to the easiest/best simplest way? Thanks in advance.