Unfortunately the old mod and this picture are not actually in 3d. They have just been colour shifted and badly at that.. you will not be able to achieve this with a simple colour channel split, this will require a new chunk of code to be written. you have to take into consideration Eye separation distance, the point of focus, the size of the display being used ( as that will alter the eye separation parameters ) and then the actual colour channel splitting, essentially it will have to show 2 of everything, one from each eye.
I actually do a fair amount of stuff using RB
glasses both still images and animation ( im also learning how to work with 3d without glasses, the kind where you go slightly cross eyed to see it ) and just to get a still image takes a fair bit of work. so i know making a game calculate that stuff on the fly isnt going to be easy.
Altho this is a mockup done in a 3d app, you can see what im talking about..
This first image is very similar to how the original 3d mod was done.. ( this is not 3d ) i just shifted the red channel slightly to the left
This second image is how the mod should have looked ( this is 3d ) i used two cameras set slightly apart, but both focused on the same place ( the middle yellow note ) to make 2 slightly different pictures, then i copied the red channel from the left image to the right image.
While im sure there is a way someone could do it with code, as long as they know enough. I do know of another way that may allow lots of people to have proper 3d Right now..
If you own one of the newish Nvidia gfx cards most of them have 3d stereoscopic display capabilities built in, you just need to download the drivers from nvidia, set a few options in the settings panel and it will then be active. All you have to do then is load any 3d game you like, hit your hotkey and it will run in red/blue 3d mode.
ive recently been playing Test drive unlimited 2, Duke nukem forever, Team fortress 2 and Brink in red/blue mode. plays well and looks cool..