GRASS VALLEY KAYENNE - V2.0 - Page 70

70 KAYENNE — User Manual
Section 2 — Concepts
Rotate — Picture rotation about the reference axis in the X, Y, and Z dimen-
sions (Figure 44). Rotate is limited to ± one half revolution, and will always
take the shortest path to the new position. Rotate uses Quaternian math to
calculate the move with increased accuracy. Multiple rotations are per
-
formed with the Spin function.
Figure 44. Rotate
Spin — Supports multiple rotations about the reference axis in the X, Y, and
Z directions. Spin supports fractional values, and is similar to Rotate when
the move is less than ±. one half revolution. Spin uses Euler math to calcu
-
late the move, which is not quite as precise as Quaternian, but permits mul-
tiple 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 45. Aspect, Skew, Perspective
Aspect — Scaling the X or Y components of the picture. X axis changes affect
horizontal size, Y axis changes affect vertical size (
Figure 45). Z axis
changes affect both X and Y dimensions, and is the same as Size.
Skew — Slanting the picture in the X (horizontal) and Y (vertical) directions
(
Figure 45).
Perspective — Changing the viewer’s apparent viewpoint of a picture. This
only applies when a picture is tilted so part of it is farther from the viewer.
Y Rotate
(Around X Axis)
Z Axis Rotate
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Y
Z
X
X Rotate
(Around Y Axis)
Y
Z
X
Y
Z
X
Aspect Skew Perspective
Y
Z
X
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Y
Z
X
Y
Z
X