How to Stop Key Drift
by Matt Estela
Note: Since writing this Armando Afre (who originally explained this whole concept on the mailing list) has pointed out that it really should be called 'spline drift' or 'channel drift'. You'll understand why by the time you finish this tut.
Once you move beyond flying logos and spaceship fly-by's, you'll come up
against an ugly artifact of 3d keyframing: key drift. Say you're trying to
make your character do a jump. This could be broken down into the following
poses:
Working straight from these key poses, I created these in an action. Here's
what it looked like: