Coop Things in Singleplayer

[Hell-met]

Hey

Apologies if this is in the wrong subforum, also apologies if this is obvious or stupid.

I wish to play all Dooms, Heretics and Hexens in Singleplayer but with all coop actors activated. Weapons, monsters, items, props. I don't want to do a local solo co-op server because there's player respawning and that's kind of lame - I want a genuine SP run but with all the extra stuff.

Is there a mod or command line I'm missing? Anything like it? I'm using GZdoom g4.2.1.

Thank you!

[_mental_]

This is not possible at the moment. in single player, cooperative and deathmatch things are discarded by the engine at early stage of level loading.
There is a chance, however, that we extend this feature suggestion with generic thing manipulation. With such option, a quite simple mod can do what you want.

[StroggVorbis]

While it won't disable respawning, you can fake a coop or deathmatch session without setting up more than one node.
Just use "map <mapname> coop|dm"
This will cause all coop/dm only actors to appear, but the game will still pause when hitting Esc, similar to Singleplayer.
You can also save and load like normal.
You could disable respawning under Gameplay Options, but I don't know if this will cause the use button to load the latest save again.

The alternative would be to make a copy of your IWADs, open the maps in Doom Builder or SLADE, select all things and remove their multiplayer only flag, then load the modified levels as PWADs.

[Hell-met]

While it won't disable respawning, you can fake a coop or deathmatch session without setting up more than one node.
Just use "map <mapname> coop|dm"
This will cause all coop/dm only actors to appear, but the game will still pause when hitting Esc, similar to Singleplayer.
You can also save and load like normal.

This seems like my best bet. Thanks. I'm rather surprised no one thought of this so many years later. Nearly all Doom2 levels have an extra cyberdemon and I like the challenge.

but I don't know if this will cause the use button to load the latest save again.

It's fine, I'm a grown up and I can handle pressing F3

[_mental_]

I'm rather surprised no one thought of this so many years later.

Single host multiplayer (-host 1 command line option) is here for at least 14 years. The second argument of map CCMD is just a bit more convenient way to do the same.