Grass Valley Kayak HD v.6.9.3 - Manual (Page 79)

Kayak — User Manual 79
3-D Digital Effects Concepts
Tension Control
In the example below, the keyframes comprise a right angle, so the
TENSION control operates on a 45° line drawn through the keyframe. This
line is referred to as the Tension Vector and is parallel to a line drawn
between adjacent keyframes (
Figure 47 ).
The TENSION soft knob controls the length of the tension vector. The
length of the tension vector is inversely proportional to its parameter value.
For example, at a Tension setting of 0 (zero), this imaginary line extends an
equal distance into and out of the keyframe, and the path through the
middle keyframe is curved. The unmodified KF2 is said to have a correc-
tion value of 0.0.
Figure 47. Tension Control Setting Zero
In the example below, the TENSION control is increased to 1.0, so that the
Tension vector is shortened to non-existence through KF2 (
Figure 48 ). 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.
Tension = 0.0
KF1 KF2
KF3
Tension
Vector
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