The Source engine is a 3D game engine developed by Valve Corporation. Its unique features include a large degree of modularity and flexibility, an artist-driven, shader-based renderer, accurate lip sync and facial expression technology, and a powerful, efficient and completely network-enabled physics system.
Learn how to use GCFScape and VMEX to extract and decompile an official Valve map to bring it into Hammer.
Posted by Silverfisk on May 24th, 2010
First we launch the game with the console enabled to find the name of the map we want. Then we download GCFScape and unpack it to our [...]/Steam/steamapps/ folder.
Then we use GCFScape to open up the desired GCF file and unpack the map we found the name of using the console earlier.
We then download VMEX and JRE 5 (Java Runtime Environment) which is required for VMEX to function. Then we install the JRE, unpack VMEX and use it to decompile the map which we then open up in Hammer.