You can’t cross-fade between cameras inside Aximmetry. This is because it only renders one perspective at a time. In order to cross-fade it would need to render the scene twice, effectively cutting the performance in half during the fade. You could program a custom “dip to black” fade in/out by triggering a smooth brightness animation from 1 to 0 and back to 1, while delaying the cut until the brightness reaches zero, effectively hiding the cut between cameras. If you want true cross-fade, you would have to use a professional studio setup, with one Aximmetry workstation per camera and an external video switcher. 

This sounds very interesting for solving our completely unrelated problems with Unreal being slow to render certain surfaces that are lit using Lumen. How would that look in practice? 

@Stefan: what it would look like? You mean visually or how to set it up? It’s just an animated curve played in both directions. If the curve from full bright to full black takes 1 second, you would delay the camera switch with one second but trigger the animation the same time you click the camera switch. It’s not a workable, general solution. Multiple workstations and external switching is the way to go if you need real-time UE5 rendering for all cameras.