On Fri, 20 Jan 1995 00:45:15 +0100, jern@spaceaix.jhuapl.edu said:
jern> Considering reaction times you might want to set a t offset of,
jern> say, -5. As in, hey, I really meant the frame I say a half sec
jern> ago. Or, use an mpeg viewer that has freeze frame, step, fast
jern> forward, back, etc.
Well, just as you specify *areas* of XY space (eg: a circle),
you'd probably also specify *volumes* of XYT spacetime (eg: a sphere,
possibly of diameter `t').