FM ActionLink - Stadiums 3D

The club's stadium in 3D, right on the game's stadium screen.

Skins

How to change the skin

Open BepInEx\config\FMActionLink.Stadiums3D.cfg and change the skin line. With the game open, the change applies within about a second.

Example, to use ASF:

skin = asf

Accepted valuesdefaultctrl26asf

On MrTini23, leave skin = default: this plugin works on it with no adjustment.

Check for BepInEx 6
Open the game folder (the one with fm.exe) and look for a BepInEx folder. If it is not there, follow "Don't have BepInEx 6 yet?" below first.
Copy the plugin
Extract the .zip into the game folder, merging with the BepInEx folder that is already there. You should end up with BepInEx\plugins\FMActionLink.Stadiums3D\FMActionLink.Stadiums3D.dll.
Install the CustomStadium mod
The plugin uses the CustomStadium stadiums (by bassyboy), the same ones StadiumInjection uses in matches. Without it, the plugin warns "Stadium mod not found".
Start the game
Open Football Manager 26. To confirm the plugin loaded, open BepInEx\LogOutput.log and look for the plugin's name.

Don't have BepInEx 6 yet?

Download the right build
FM26 uses BepInEx 6 for Unity IL2CPP, not 5. Download the file named BepInEx-Unity.IL2CPP-win-x64-... (build 755 or newer). Do not take the Mono files or anything labelled 5.x. You can tell them apart once extracted: BepInEx 6 IL2CPP has a dotnet folder next to the BepInEx folder; 5 does not.
Extract into the game folder
Extract the file into your Football Manager 26 folder, the one containing fm.exe. Next to fm.exe you should see the BepInEx and dotnet folders and a winhttp.dll file.
Start the game once and wait
On first launch BepInEx reads the whole game and generates its files. This takes several minutes, and the game may look frozen or show a black window. Let it finish.
Confirm it worked
The file BepInEx\LogOutput.log now exists and the BepInEx\interop folder is full of .dll files. Only then install the plugin.

How to use

Open the club screen
The club's real stadium spins in the empty part of the header (default and ctrl26 skins) or in the "Stadium" card of the ASF skin. The title is the stadium's name in the game.
Click to enlarge
In the large window, drag to rotate and tilt, use the mouse wheel to zoom and double-click to go back to the starting view.
Tune it in the config file
Edit BepInEx\config\FMActionLink.Stadiums3D.cfg: skin (default, ctrl26 or asf) and stadium_3d (off turns everything off). The file is re-read every second.

Good to know

Clubs without a 3D stadium show "No 3D stadium for this club". On the ASF skin they show the skin's photo with a red notice.
The original stadiums are never changed. To open quickly, the plugin prepares lighter copies of your league's stadiums in the background after the save loads: opening an original takes 6 to 20 seconds; the copy, about 0.1.
Stadiums that float, such as Grêmio, Etihad and Inter, get their ground adjusted automatically.