pannini view leaving me with holes

Hi,

I know that, the problem is - at the nadir and zenith point the values in pannini projection get infinite,
so I must limit this values to avoid problems, that's the reason for the hole

but I will try to find a way to solve this, maybe via a slight shift to left/right...
or try to use a cubical pano and different details setting, there it could be possible that
this infinite point is never reached,

best regards,
Klaus