I'm making Doom E1 M1 (Hangar) map for multiplayer and I'd like to have some classic doom scenery. For those who don't know, it's basically a texture that always faces the player (faking a 3D effect, more like a 2.5D). I've tried using a particle effect with not so good results. Any ideas or if it's even possible?

I think powerups in this map work that way
https://haloce3.com/downloads/multiplayer/original-multiplayer/containment-segment/

See if there's a checkbox for two-sided or something in .scenery
Not entirely sure but I recall seeing something like that somewhere in Guerilla

Detail Object Collections do exactly this.

I looked up the tutorial for detail_objects and when I try in sapien nothing shows up.

all you'll see in Sapien will be little lines protruding from the ground if done correctly. I know, it's dumb.

Sweet! Someone replied to the thread and now I can reply again. I don't know where the "Edit" function is for a previous post that it mentions, and it won't allow me to post under myself.

Anyway, yeah I found out that I had to save the bsp in sapien so that it would show the detail_object_collection. One of the problems with them that I've noticed is that they tend to bleed into one another. I can sit one in a spot and then one in another, if getting behind one of them and facing the other, it will show the other through it. But, for one of them, they appear ok. It's really weird. Here's some example images:

From barrel 2 to barrel 1 (the bleeding)



From barrel 1 to barrel 2 (seems ok)

You can't really fix that, they just render in the order they are stored in the BSP.