Thanks for your advice. With the system you recommended it is perfect for making a cube map. I needed to make the shape of the parallelepiped. I found the solution by setting the viewing angle of the camera. I created a 3d parallelepiped on sketchup to understand what the viewing angle had to be and then I inserted it into the camera. I made the comps with the right proportions of my paralelepiped and then orienting the 6 cameras (5 in my case, I don’t need the ceiling face) in the right direction wuth the same position and I got the result I wanted. In practice I have done manually what the after effects VR does, but simply adapting it to the shape of the parallelepiped. Bye!