The Compositing Mode button determines how the transparency in a video track is generated.

Hold Ctrl while clicking the Make Compositing Child button to move a track and all its child tracks in one level.įor examples of how parent/child track relationships affect 3D compositing, click here. When you have multiple levels of parent and child tracks, clicking the Make Compositing Child button moves the track in one level and clicking the Make Compositing Parent button moves out one level. You can also produce complex compositing by creating nested parent/child groups with compositing parents and children at various levels. In this example, the third track is also a parent, so it is displayed behind the composite of tracks one and two. The third track is also a child, so it is displayed behind track two. The circular region in the mask is transparent, so the second track shows through. In this first example, there are three tracks.

how they are composited together) is determined by the parent track.Ĭlick the Make Compositing Child button on a parent track to make a child track.Ĭlick the Make Compositing Parent button on a child track to make a parent track.

In general terms, the parent track is the highest track in a group of tracks (often only two) and the behavior of the child tracks (i.e. The key to understanding overlays, masks, transparency, and compositing is to understand the parent/child relationship between tracks.

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