GRASS VALLEY zodiak, User Manual

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84 Zodiak User Manual
Section 2 — Concepts
Path Control
Paths
Keyframes specify parameter values at specific times in an effect. Most of
the duration of an effect, however, occurs between these keyframes. The
Zodiak system interpolates parameter values between keyframes (inbe-
tweening). The trajectory, or path, a manipulated picture travels between
keyframes is determined by how these inbetween values are interpolated.
The Zodiak system offers you several path controls (
Figure 58 ):
HOLD
— No interpolation. Keyframes hold their values for their durations,
then change all at once for the next keyframe.
LINEAR
— Applies a linear interpolation between keyframes; no acceleration
or deceleration is applied. Movement is mechanical with a constant
velocity.
S-LINEAR
— Applies a linear or straight line motion between keyframes,
with acceleration and deceleration applied at the beginning and end of
each keyframe.At each S-Linear keyframe the motion is stopped for two
fields.
CURVE
— This selection causes a rounded path through the keyframe. Paths
are user adjustable with path modifiers (tension, continuity, and bias)
described below.
Figure 58. Path Types
Hold Linear
0721_06_45_r1
S-Linear Curve
KF1
Slow
Fast
Fast
Stop
Constant
Speed
Slow
Slow
Slow
Fast
Fast
Slow
KF2
KF3
KF1
KF2
KF3
KF 1
KF2
KF3
KF1
KF2
KF3