NewTek TriCaster 300 - Manual (Page 190)

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Again, if you drag just one of the numeric gadgets below the Size button (with lock disabled), you
modify just one dimension of the overlay stream – width or height.
Position and Size can be reset by clicking Reset Positioning, and can be toggled on or off by
clicking the Position button located to the left of the Configure button (gear). You will likely have
realized by now that simply using the Virtual Input controls considered so far, you could scale a
live video source down, and position it above another source to create a picture-in-picture effect,
or even two live insets (with a black background).
12.3 OVERLAY
Figure 163
Another switcher-style source selector is situated right above the Input A row in Virtual Input
tabs. It is labeled Overlay. Just above that at right, you will also see local transition controls that
are quite similar to those found in the Switcher’s Transition pane.
Really, the Virtual Input Overlay feature matches the DSK channels found in the Switcher’s main
Transition section in almost all respects. Unlike the DSKs, though, its inclusion in Virtual Input
tabs make it a ‘pre-Switcher’ sub-layer (along with Input A and B).
This means that the Overlay is applied before that composition is sent to the Switcher. Thus
content in a VI Overlay appears beneath anything displayed via the two (Switcher) DSK channels.
The Overlay selection and Position controls work just like their Input A and B cousins, discussed
earlier (see Section 12.2).