System information
For examples of how parent/child track relationships affect 3D compositing, see "3D Compositing" on page 
391.
Learning more about compositing modes and transparency
The Compositing  Mode button   determines how the transparency in a video  track is generated. Because 
lower tracks show through higher tracks, it  is the compositing mode of the higher track that determines how 
much of  the lower track shows though. The compositing mode of the lowest video  track adjusts its 
transparency against the background.
The mode can be selected by clicking the Compositing  Mode button and choosing a mode from the menu.
The following examples demonstrate how each of the compositing  modes would affect two simple tracks. 
Track one is a generated media event  with a transparent edge, and track two is a DV clip.
COMPOSITING VIDEO387










