Mipmapping probably 

Pritchard! It was a brand new install made specifically for my mapping works and I had forgotten to set anisotropic filtering. It was set to 1, which would be the default I guess. I set it to 8 like I always do and the issue disappeared.

Pritchard, here's your prize: a coupon allowing you to facepalm me if we ever meet in person.
https://img.ifcdn.com/images/99bdb68b0fcad2043abbf97f1390375662d75e070a31a010cb1502dd48d5a7e5_1.jpg 

looks like mipmapping 

The Anisotropy is for the floor but I believe it allows the mipmapping to take place further away. You could probably remip those textures, esp the wall. If you didn't remip them then it will use the old full detail texture (albeit scaled down), you can do it in Wally. I think there is an option for Remip all actually. 

Anisotropic filtering fixed my corner overhead too.

Actually, it was TexMex that generated the mipmaps from the full-size textures. I did notice they looked slightly wonky in TexMex but I attributed it to the display method, like when you use a font in Word in a small size. You say Wally can do better? 

Do you have a link for Wally? I googled it and found a wallpaper changer. 

http://www.quaketerminus.com/tools/wally_155b.exe

I use Wally for packing WADs, TexMex is driving me nuts...
Shame that Slade can't pack Quake WADs, it's a very good tool. 

 

You can turn off the auto remipping option in TexMex. I don't know what happens if you do. Does then engine just create them on the fly? 

Pretty sure fitzquake/QS ignores the mipmaps in the bsp, software engines use them though.
Not sure about glquake and other gl engines. 

 

How can I make a button that doesn't move when it's pressed? Looking at the qc, a button that doesn't have the lip value set will default to a lip of 4, which means that setting lip to 0 essentially sets it to 4.

Does anyone know a way around this? I've been fiddling for a little while now with values and I can't find any values that work. 

signed zero may work. 

No dice :( 

if you make a worldspawn clone of the button and use hintskip, then texture only the face of the skip. Seems to work for me 

I'm currently trying to make enemies rise out of a liquid for my map. Unfortunately I seem to be running into trouble with the func_door brushes stopping when they are obstructed by the enemy, although they eventually will succeed if triggered multiple times. Any advice on avoiding this? 

I have no idea how to make worldspawn clones of the brush or hintskip. It sounds hard :/ I ended up "solving" the problem by altering the brush behind the button so that z-fighting never happens when the brush moves back. 

Here's a link with the bjptools-phong files where you can grab the hintskip wad. You can texture the skip and it will be a nonsolid/textured brush in game. 

Setting the lip equal to the thickness of the brush worked for me on a door used as a button. The brush is 16 units thick and the lip is set to 16. The movement is set to down (-1). 

I'm trying different things at this point, such as a func_train, but I still can't overcome the blocking issue posed by trying to lift flying monsters. Has anyone managed to do it in their map? :( 

Just a shot in the dark, but maybe func_plat would work? 

Does anyone know what causes this? Tried to quickly test my suggestion to Pritchard above by making a simple map with a water brush, func_plat and a couple of monsters, plus a trigger_once. If I delete the trigger_once I still get the error (it happens when I try to compile the map).

Using the latest version of tyrutils-ericw and a slightly outdated version of TrenchBroom2, FWIW. 

Check your.map file for stray entries I suppose. Also regular enemies should work fine. My issue is that I'm trying to move a flying enemy, so make sure you test that. (Specifically, the sentinel from Quoth)

Good luck :S 

I've just played the Arcane map found on Quaddicted and there's an exit teleporter rising from lava. Granted it's not monsters but if you can decompile it, maybe it could be of some help?