GRASS VALLEY Kayak - Axis Location; Perspective; Skew; Source and Target Space

Kayak — User Manual 67
3-D Digital Effects Concepts
Skew
Slanting the picture in the X (horizontal) and Y (vertical) directions
(Figure 35).
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.
The farther portion appears smaller than the closer portion, and the
amount of perspective controls how much smaller the distant part is
(Figure 35 on page 66). Multi-channel perspective is discussed later in this
section.
Axis Location
The axis location of the channel determines the center point of translations,
spins, and rotations for that channel. You can move the axis to a new loca-
tion to change the behavior of that channel. The axis location can be within
or outside the screen area.
Z Axis Rotation at Different Axis Locations
Figure 36. Frame of Reference Axis Locations
Source and Target Space
The Kayak Digital Picture Manipulator uses source and target space frames
of reference.
• Source space for a control channel uses that channel’s coordinate
system for reference.
• Target space for a channel uses the next higher level’s coordinate
system for reference.
Being able to use both source and target space can help make effects editing
easier. One frame of reference may offer a simple and easy to understand
context for a picture transform, while in another frame of reference the
Y
Z
X
Axis at
Center of Picture
Different
Axis
Locations
Y
Z
X
Axis Off
Center of Picture
X
Y
Z
Axis Off Screen