Viz Vectar User Guide
Version 1.0 | Published May 07, 2020 ©
Compositing
When you enable (and configure) LiveMatte for an input, the onscreen monitor for that input shows the source keyed over a checkerboard pattern (when the Checkerboard option is selected in Overlays for the monitor).
If you select the (LiveMatte-enabled) input as Input A in an M/E tab in LiveMatte mode, the keyed source is overlaid on sources in lower input rows. The composite result shows when the output is assigned to either the PGM or Preview row.