Desktop Virtual Reality is a new kind of 3D, in witch you change the position of the camera according with the position of the head of the player.
You have the feeling that you are looking throw a window
A very famous video is
thisMe and 2 friends made
our version, using the engine ogre3D (for the graphics) and wiiuse (for the wiimote)
We made depth too, and that's not very easy to find in the videos out there...