by Major Banter on Mon Jul 29, 2013 6:14 pm
You know, you really should get this stuff resolved before you even begin planning anything, let alone working on core design.
To my awareness it CAN be done, as the Infected have been successfully ported to TF2 and Gmod, but that's little more than models, animations and general behaviour, most of which will involve some serious code work and a real grind of moving stuff from a newer codebase to an older one. It's port, port, port.
You won't get the Director across either, so you'd also have to create spawning parameters (e.g. brush based spawns) unless you intend to spawn every single zombie individually via Hammer.
Everything will have to revolve around this. It's a real damn chore to my awareness and will take a great deal of time even for an experienced coder - if anyone can confirm that I'd appreciate it.
Edit; although, thinking about it, if you get a really boss coder it could probably be done in good time.