RENDER REGIONS FOR 360° SCENES?
Is there any way to only render certain parts of my equirectangular stereoscopic 360° scene?
I want to use a clean plate and only add the parts that are moving on top of it in post instead of rendering the whole scene for every frame. So ideally I am looking for something like CTRL+ B but to select something off the whole 360° scene instead of something within the camera object’s view. 
Do I get my point across? 
I’ll be so happy for any help or advice on this one.
Best,
Chris