"invisble one-way wall" problem Created 17 years ago2006-09-05 11:40:36 UTC by eightballrota

Okay. I try to figure most problems out myself now, but this one has me stumped. I have a few invisible objects that block the players path at three spots in my bar map when there shouldn't be any objects. Its an open area behind the bar, I didn't put any thing there in hammer, but when the map is compiled (without vis or rad mind you) there is something preventing movement, but only from one direction. If I strafe right, I get stopped by thin air. If I go around and strafe left, I can pass normally. It seems there is a one-way invisble wall. I've looked in hammer, and nothing is sticking out. Is this a bug in hammer or something? I can post the map if anyone is willing to investigate.

Everytime I encounter an error these days, I log it and the solution--if I can find it--in a big txt file. Here is my entry on invisible brushes:

--Invisible Brushes: If your running into an invisible brush in the game, and it's nowhere to be found in Hammer, try deleting/redoing all the brushes around that area... should fix the problem.

If they're is any complex architecture close to the problem area, func_wall it, and it should also eliminate the problem.

Another possibility is that you have some brushes visgrouped you forgot about, but this is reaching now

Elon says this is caused by a leaf saw into leaf error, which I will have to check out further.

I actually went back to a previous build that didnt have the error, and copied/pasted my new work into it, and it worked okay. Thank god for betas!!! (i think im up to beta 16 or something now) It just bugged me that I couldnt figure it out, esecially since I don't have any visgroups set up.

@ rowleybob:

I had one of those that was driving me crazy. I'd put a new tunnel through somewhere that hadn't had one originally. It was narrow, but should have been wide enough to fit through -- but when I tested I couldn't get through. Spent an hour carefully widening it (lots of fiddly brushes, not much room to work with) and tested again. Same thing. Suddenly it clicked...

Went into Hammer and turned my "clipping" level back on. Sure enough, I had a clipping block right through that area (to simplify calcs for a complex-but-unreachable bit the other side of the wall...)

sigh

It's usually a rogue vertex that's not quite on the grid.

It could be caused by anything - V.Manipulation, Carving, Even Hollowing - or inserting bad prefabs... Or even by the editor - when you resize several brushes at once.

Good way to avoid it is just to map out one brush at a time.