Last time when I heard from him he was working on a GUI version. The rest of this document was written mostly by him. This, together with existing features, will make it an even more powerful tool. There are no format restrictions for a .scr file that I can remember. Some mistakes in .scr files will be caught but basically if you get a seg fault, the problem is in your .scr file.
Animation is done by specifying trajectories of actors.
Coordinates are interpolated with a cubic spline. The examples should make this clear. Notes and limitations Motion Blur is not working. Known bugs - the usual problem of a camera passing through the point it is looking at is not correctly addressed. The standard RM lights are supported and they are specified RM style except that parameters can be time dependent via formulae.