We like Source SDK Hammer editor!

1. Start Hammer

2. Go to 'Tools' and then 'Options...'

3. Go to the 'Game Configurations' tab (you should be there automatically.

4. Click the edit next to the Configuration box.

5. Click 'Add' and type in Garry's Mod 10. Click the 'Add' button under Game Data Files. Find the 'garrysmod.fgd' file in your garrysmod/garrysmod folder. Click Close

6. Make sure the texture and map type is Half-Life 2.

7. The Default PointEntity class can be whatever, it's the entity that is automatically loaded first when you start Hammer. I use info_player_start. The Default SolidEntity class can be whatever as well, it's the entity that a block automatically becomes first when tied to an entity. I use func_detail.

8. Game Executable: $SteamUserDir\garrysmod\garrysmod

9. Game Directory:
$SteamUserDir\garrysmod\garrysmod

10. Hammer VMF Directory: $SteamUserDir\sourcesdk_content\garrysmod\maps

11. Switch over to the 'Build Programs' tab at the top.

12. Configuration: Garry's Mod 10.

13. BSP Executable: $SteamUserDir\sourcesdk\bin\orangebox\bin\vbsp.exe

14. VIS Executable: $SteamUserDir\sourcesdk\bin\orangebox\bin\vvis.exe

15. RAD Executable: $SteamUserDir\sourcesdk\bin\orangebox\bin\vrad.exe

*NOTE* Steps 13, 14, and 15 might be different if you want to run it on a different engine.

16. Place compiled maps in this directory before running the game: $SteamUserDir\garrysmod\garrysmod\maps

17. Hit 'Apply' and restart Hammer.

18. 'Garry's Mod 10' should appear in the Source SDK current game list.


DO NOT RESET GAME CONFIGURATIONS! It will delete all that you just did.