Here's a video. http://www.youtube.com/watch?v=gu9yddYHZD8
Valve broken shadertest/gooinglass in ob update. So heres my fix as another option instead, this is for mappers and normal players.
Place "shadertest" folder in the materials folder
E.G. "C:\Program Files\Steam\steamapps\USER-STEAM-USER-NAME\half-life 2 deathmatch\hl2mp\materials\shadertest"
Made By: gtamike_TSGK
Unzip and place the "materials" folder in your "materials" folder for your game.
E.G. Overwrite the folder "materials" with the one you just downloaded.
Place the folder here. C:\Program Files\Steam\steamapps\YOUR-STEAM-NAME-HERE\half-life 2 deathmatch\hl2mp\
I also added a test map called "shadertestfireglass.bsp" and SDK Hammer .VMF "shadertestfireglass.vmf"