I’ve got an object that will rotate smoothly in a (say…) 180-frame-long rotY IPO in an ordinary render-sequence.
In GameBlender, I link an Always sensor (firing every 180 frames) to an IPO actuator (frame-ranges 0…179) and…
… I get an animation that isn’t smooth. Not at all. It rotates “forward,” then jitters and seems to rotate backward. Absolutely horrid.