GRASS VALLEY Kayak - Aspect; Rotate; Spin

66 Kayak — User Manual
Section 2 — Concepts
Rotate
Picture rotation about the reference axis in the X, Y, and Z dimensions
(Figure 34). Rotate is limited to ± one half revolution, and will always take
the shortest path to the new position. Rotate uses Quaternion math to cal-
culate the move with increased accuracy. Multiple rotations are performed
with the Spin function.
Figure 34. Rotate
Spin
Supports multiple rotations about the reference axis in the X, Y, and Z direc-
tions. Spin supports fractional values, and is similar to Rotate when the
move is less than ±. one half revolution. Spin uses Euler math to calculate
the move, which is not quite as precise as Quaternion, but permits multiple
rotations. Spin applies transform values in Z, X, Y order, so editing effects
in this axis order provides the best control of the effect.
Note Following broadcast conventions, moving the Joystick forward or back along
the Joystick’s Y axis rotates the top of the picture forward or back (a rotation
about the X reference axis). Similarly, moving the Joystick left or right along
the Joystick’s X axis rotates the side picture left or right (a rotation about the
Y reference axis).
Figure 35. Aspect, Skew, Perspective
Aspect
Scaling the X or Y components of the picture. X axis changes affect hori-
zontal size, Y axis changes affect vertical size (Figure 35). Z axis changes
affect both X and Y dimensions, and is the same as Size.
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Y
Z
X
Y
Z
X
Y
Z
X
X Rotate
(Around Y Axis)
Y Rotate
(Around X Axis)
Z Axis Rotate
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Y
Z
X
Aspect
Y
Z
X
Skew
Y
Z
X
Perspective