We have now two different anchor buttons in the Images tab. How about
adding two more buttons:
- Anchor this image as nadir shot
- Anchor this image as zenith shot
This is a simple step even for newbies and both new anchors would tell
hugin (i.e. the optimiser) that a certain image contains one pixel with
pitch=-90 or pitch=90 respectively.
I think these two new anchors together with at least one pair of
vertical CPs would work great to avoid images flipping over during
optimisation.

Maybe this could even be a replacement for the 'Anchor this image for
position' button.

Yuval Levy wrote:
> 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.

Just a crazy thought: how about a special CP for the sun? If I see the
sun in my panorama and simply mark the sun's center with a "directional
CP" this could probably help to find the real North in case the time
(UTC+-...) (and date?) are correct. Maybe a cool addition when several
panoramas should later be linked within a tour -> automated Hotspot
addition...

Carl

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