Grass Valley NewsEdit XT v.5.5 - Manual (Page 208)

Chapter 11 Creating Video Effects (Option)
206 Digital News Production
Defining 3D Source and Target Space (NewsEdit XT only)
NewsEdit uses two frames of reference for its 3D transformation effects: source
space and target space.
• The source space uses an object's (channel) coordinate system for reference.
• The target space uses the coordinate system of the next higher level for
reference.
The combination of source and target space is useful in effects editing; one space
can use a simple context for image transforms, while the other can use a more
complex coordinate system. Manipulating the two spaces simultaneously can
create complex effects.
The simplest way to visualize source vs. target space is to move a rotated picture
across the screen using two coordinate systems:
• The rotated picture is the source space, or frame of reference. The source's
coordinate system is transformed with the picture so that the x, y, and z axes
are defined relative to the 'face' of the picture.
• The monitor screen is the target space, or frame of reference. The target's
coordinate system is unchanged -- x is left to right, y is up and down, z is closer
and farther. In this case the target space is also the global frame of reference,
having the same coordinate system as the screen.