dv-community-map/CommunityMapTool/build_guide.md

Assuming Visual Studio Community:

1. Add the following to the lib folder from [steam common dir]/Derail Valley/DerailValley_Data/Managed/UnityModManager:

• Assembly-CSharp.dll
• BezierCurves.dll
• DV.Common.dll
• DV.OriginShiftInfo.dll
• DV.RailTrack.dll
• DV.UserManagement.dll
• DV.Utils.dll
• UnityEngine.dll
• UnityEngine.UI.dll
• UnityEngine.InputLegacyModule.dll
• UnityEngine.IMGUIModule.dll
• UnityEngine.CoreModule.dll
• /UnityModManager/0Harmony.dll
• /UnityModManager/UnityModManager.dll

2. Build Solution
3. Copy info.json and bin/debug/CommunityMapTool.dll to Derail Valley/Mods/CommunityMapTool
4. Run game using Unity Mod Manager

Mod functions are all within the UMM settings screen.