@bonemap said:

You can create a fisheye lens effect with the 3D Stage Orientation actor. It has a FOV property that simulates a camera lens. There are other camera controls there as well. It requires a 3D object - perhaps 3D Quad or 3D Projector with a Virtual Stage routed to it. I know it is not as simple as a pass through video actor, but just so you know it is there.

I got a question yesterday about how to do dome projections and it turns out that fisheye effects are a great solution for that, which led me to re-discover this topic. 

I'm performing this act of thread necromancy because I've made an example file based on what the ever-brilliant @bonemap wrote here: fisheye-using-3d-actors-2023-11-17-3.2.6.zip

Hi,

The 3D render is now called Virtual stage. And the fisheye is a freeframe plugin that you can download - I am not sure if these are still available though.