Tektronix Grass Valley 3000 - Manual (Page 248)

B-8
Appendix B — Keyframe Facts
In Example 2, the TENSION control is increased to 1.00, so that the
Tension vector is shortened to non-existence through KF2.
The path enters and leaves the middle keyframe in a straight line
as it takes on an S-Linear motion; decelerating as it enters the
middle keyframe and accelerating as it leaves.
Example 2
Tension = 1.0
KF1
KF2
KF3
No Tension Vector