GRASS VALLEY zodiak, User Manual

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Zodiak User Manual 77
3-D Digital Effects Concepts
Rotate
— Picture rotation about the reference axis in the X, Y, and Z dimen-
sions ( Figure 47 ). 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 47. 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 froward 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 48. 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 48 ). 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 48 ).
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