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Just straight up Quake 2

This is a fully functioning Quake II simulator running inside pure gmod Lua.

Every asset (maps, textures, models, sounds, etc.) is generated on-demand from .pak files.
In order to play this you need to show those files to garrysmod.

Copy the 'baseq2' folder from Quake II into your 'garrysmod/data/quake2' folder.
Do not use the NightDive 'rerelease' folder (its maps have too many brush surfaces for gmod).

Most of the features in this addon are designed to work in singleplayer.
It can work in multiplayer, but I recommend only playing with people you trust.
Everyone effectively has some control over the server gamestate (i.e. map transitions).

Basic multiplayer is supported, but the latency is terrible at the moment because
the simulation is currently emulated at 10hz and lacks any prediction.
So if your ping is over 80, it's not gonna be a fun time.

If you decide to host this to play with friends keep in mind that each player
must also have Quake II set up in their /data directories.

By default all maps are downloaded at runtime to clients after they are generated.
If you wish to bypass this, consider hosting the following addon on your dedicated server:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=3333685917

It contains pre-compiled versions of all the maps that ship with retail Quake II (w/o textures).
This will save you and your friends some slow download times as you play through the campaign.

This has been a 2+ year project for me and I've tried to cover as much ground as possible.
However there are still bugs and QoL things that haven't made it in yet.

Please make discussion posts on this workshop page if you encounter issues or have a request.
If a discussion already exists, post in there to boost visibility. I'll keep my eyes on it.