Momentum Mod is not officially supported by Hammer++, but can be made compatible by following this guide.
Prerequisites:
- GCFScape
 - Hammer++ CS:GO Build
 - About 42 GB of disk space (depending on how many games are mounted)
 
Hammer++ Configuration #
- Install GCFScape and extract the Hammer++ .zip file into your 
Counter-Strike Global Offensive\binfolder. - Run hammerplusplus.exe
 - Copy the following configuration:
 

Mounting Games #
In order for Hammer++ to load content from the various games that Momentum Mod mounts, follow these steps:
- Extract materials, models, and sounds from .vpk files:
- Extract 
Counter-Strike Global Offensive\csgo\pak01_dir.vpkintoCounter-Strike Global Offensive\csgo\csgo_content - Extract 
Counter-Strike Source\cstrike\cstrike_pak_dir.vpkintoCounter-Strike Global Offensive\csgo\cstrike_content - Extract 
Portal 2\portal2\pak01_dir.vpkintoCounter-Strike Global Offensive\csgo\portal2_content - Extract 
Team Fortress 2\tf\tf2_misc_dir.vpkandTeam Fortress 2\tf\tf2_textures_dir.vpkintoCounter-Strike Global Offensive\csgo\tf2_content 
 - Extract 
 - Mount Momentum Mod content by running this command in a command prompt: 
mklink /D "<path to steam games>\Counter-Strike Global Offensive\csgo\momentum_content" "<path to steam games>\Momentum Mod Playtest\momentum" - Open 
Momentum Mod Playtest\momentum\gameinfo.txtand copy the following contents into the SearchPaths section: 
game        "csgo/csgo_content"
game        "csgo/cstrike_content"
game        "csgo/portal2_content"
game        "csgo/tf2_content"
game        "csgo/momentum_content"
- Open Hammer++ and the content from these games should load now.
 
Warning: If Hammer++ crashes on startup, you may have to delete the particles folders that were extracted from the .vpk files.
Lights.rad Setup #
In order to support light emitting textures from Portal 2, copy the contents from Portal 2\portal2\lights.rad and paste them into Counter-Strike Global Offensive\csgo\lights.rad