Have you ever wanted to turn some detail brushwork into a prop? Well now you can!
You can also just export the map itself as a guide to build props around it.
Happy Mapping!

You need:
Hammer map editor : From your games specific SDK, found in the steam library.
Crafty : http://nemesis.thewavelength.net/index.php?p=46
Blender: https://www.blender.org/
Blender SMD plugin: http://steamreview.org/BlenderSourceTools/
(I use blender 2.77 if you use older blender like i do, you need to download an older smd plugin too.)
Crowbar: https://steamhost.cn/steamcommunity_com/groups/CrowbarTool

The guide about separating custom from original game content: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1507939076