How to make a Dynamic/Map Background (Video)
So in this tutorial I'm going to show you how to make a Dynamic Background or a Menu Background Map.
A Quick note: Background maps are the 3D moving backgrounds that appear behind the menus when the game is first launched. They are compiled BSPs, just like standard game maps. Background maps are designed to be used for single player games like Half-Life 2, although any mod can use them. The background map can change as the player unlocks chapters of the game, depending on the author's preferences. - Valve
The tools which we are using in the tutorial:
Photoshop CS5 or whatever you have to edit your scteenshots/images with
VTFedit: (Download link)
and of course Hammer Editor, to make the map...
So I made this video here, so just sit back and relax or whatever :P
Go to youtube to check out a bigger version if you don't see what is in the video...
Sorry about my voice and I suck at Engrish :P
Good luck :)
Here is the stuff for the vmt file