Hi Bill,

awbrody wrote:
> Re: > Editing the zenith or nadir of a panosphere is a nightmare;
> 
> Both zenith and nadir are problematic to align properly.

I was writing of editing, as in masking, paiting, etc. In my use I don't 
see any difference in aligning images at Zenith/Nadir or elsewhere on 
the screen. Can you elaborate why those images do not align for you?


> It's not all
> that hard to get the zenith within hugin by manually placing zenith
> shots without control points. The nadir, however,  is especially
> difficult not only to align, but also to photograph since the tripod
> and head are in the way.

Why do you need to place the Zenith manually? Yes, the tripod is in the 
way of photographing the Nadir, but there are ways around this such as 
removing the tripod and shooting hand held (and soon, using XYZ 
correction). From a stitching workflow perspective (as opposed to a 
shooting workflow perspective) Nadir and Zenith are exactly the same 
thing. It is one of the unsolved problem of stitching the sphere, to 
determine computationally what is up and what is down. This is why 
sometimes panoramas stitch upside down.

Yuv

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