NDICast is an app created in Vuo 2.1.0, it looks at the primary and secondary displays connected to your Mac and allows the user to choose which display they would like to screen mirror over to NDI. NDICast appropriately scales the resulting image to the broadcast resolution chosen. By default the settings are Primary Display at 1080p resolution.
I created this app to allow me to broadcast my displays over the network to another computer. It’s very exciting that NDI is now supported natively in VUO!