Dome projection

Hiya,

For special visualisations, we have a Dome at the office.
This one is made for an Elumens lens.
To view content in the dome it must be deformed into a fisheye like projection. It is not a pure fisheye, the center of perspective is not in the center of the image. It’s slightly below that. This is done because the projector with fisheye lens stands at about 75cm above ground, and people using (viewing) the dome are standing. This way the perspective is right for the user (viewer)
The only way now is to render 4 separate camers and stitch them afterwards.

Does anyone know if there is a way to render the deformation directly.
I’ve seen fisheye renders, but they all have the perspective-center in the middle of the image.