[TF2] Propcombine fails to combine
Due to lack of documentation, it could be probable that the Issue might be due to wrongful setup of comp_propcombine_set.
Following Error is output when trying to combine a multiple of props with the same model:
[INFO] mdl_compiler.enter(): Found 0 existing models/maps/first_room30halfmethod_smallersize_backup/propcombine/*
[WARNING] propcombine.group_props_ent(): Unused comp_propcombine_set at -2731 -3168.97 888.021
[INFO] propcombine.combine(): Combined 531 props into 531 groups (0 this compile):
| - 0 grouped models
| - 0 ineligible
| - 531 failed to combine
|___
first_room30halfmethod_smallersize_backup.log


That looks wrong, yeah. What you need to do is change the mins/maxes to surround the props you want to combine together. It'd be easier though to use comp_propcombine_volume, so you can just use a brush, or enable the auto combine range option so it's automatic. The model filter isn't required also, that's there in case you want the set to apply to only some models.
Yeah would've loved to but it does not seem to be an option for some reason

It's a brush entity.
Alright, tried it with the method you mentioned above

i am getting this error message however

The issue there is actually from studiomdl, check the log file to see the full error. Since your box is pretty big, it might have hit a vertex limit or something - you want to do smaller sections. Also, use tools/toolspropcombine, it's designed to not produce collisions or the like.
Yeah i think the main issue could've been that i didn't use the toolspropcombine texture, though what's the best method of checking visually if it properly combined those props?
Turn on r_colorstaticprops, and each prop will be tinted a different colour. You could also browse models/maps/yourmapname/propcombine/ and inspect the results.
This seems to be resolved.