Strange Invisible Walls Created 8 years ago2016-04-28 22:31:13 UTC by X-LAyer2

Hey TWHL, long time no see. I've got a problem I've never personally encountered before and haven't been able to dig up any info on through Google. Basically, after compiling my map I've found two instances where there are invisible walls that can be passed through from one side but not the other.

The first I've encountered is through a doorway, which can be passed through normally going the direction you're supposed to be travelling, but if you try to backtrack you'll be blocked. Even more oddly is that sometimes it seems like you can jump over or crouch under this wall to bypass it.

The second appeared in the middle of a random hallway, but also has disappeared completely after recompiling the map with no changes made (the first one has remained despite multiple compiles).

Obviously I didn't construct anything of the sort in Hammer, and I don't think I'm seeing any errors in the log either.

If you're interested, here's a link to the map files. Maybe someone can see something I'm missing, it has been 4 years since I made a map after all.

You'll find the invisible wall right in the first doorway if you try to backtrack once walking through it.

https://www.dropbox.com/sh/mlcl4hef5yzwg5v/AAA3Sxt9SEn1AzNpPzp-n7Vva?dl=0

I have seen this problem before and it's in my mp farm map. It's caused by rotated architecture because apparently hammer and gold src doesn't really like anything other than nice clean edges. It will cause strange clipping issues randomly.

I'd say first step is look for any malformed brushes. If you've been doing any vertex manipulating or clipping, check those brushes for invalidity to make sure they aren't causing the trouble.
I'm pretty sure invalid brushes have caused strange clipping errors for me in the past.

texture the unseen faces with bevel?

If the error is persistent, make that whole doorway func_illusionary and den use simple clip brushes to approximate the doorway. Also double check your compile log that there is nothing weird going on.

As a test, maybe try a different cliptype to see if it makes any difference. (not 100% sure, but think I always used

-cliptype simple

)

I'll check out your map when I get home from work if you haven't sorted it by then..

well its an old bug, what compile tools are u using?

Seems to have been the door, not entirely sure why since it was just a simple rectangular sliding door, but I deleted it and made a new one which fixed the problem.

Thanks for your suggestions guys.

Have you used the "carve" tool?
I remember, I got sometimes some strange clip-brushes when I used it.

Nah, I had it pounded into my head long ago that carving is best avoided.