Can we modify the 360 Bird eye view stitching to just few cameras?

Hi,

I would like to modify the 360 degree Bird eye view to just viewing lets say 180 degree view with 3 cameras or even 270 degree view with 5 cameras. The provided example is good enough to run the demo with all the cameras but am looking to see if the above mentioned possibilities exist or the existing function can be modified to work with my expectations!

-Dinesh