Creating machinima with a video game engine usually requires accepting one of two truths: either that it will require a lot of fudging or that it will have all the sophistication of playing with action figures. Valve Software isn't very happy with that dichotomy, which is why it's posting its very own movie-making tool, Source Filmmaker, as a public beta. Any game that runs on the Source engine, whether it's Left 4 Dead 2, Portal 2 or another in the family, can have gameplay run-th
