An example of a technique that has now gone on to be known as Machinima (film made using a real-time rendering engine). Quake Movies really took off after the release of KeyGrip (for Quake1), and then KeyGrip 2 (for Quake2). These allowed non-linear editing of the demo files, as well as the ability to move the camera at a later stage (in KeyGrip 2)