On Monday, April 21, 2014 10:38:19 PM UTC+1, Donald Johnston wrote:
>
> The two images I’m using were taken with my lens set at 24mm (a bit to the 
> wide angle) so the building leans to the left in the left image and to the 
> right in the right image; that’s why I was using the vertical line control 
> points.  The overlap area contains the entire vertical part of the building 
> in both images so I was able to but exactly the same t1 points on both 
> images (for example, the vertical tower in the middle of the building).  So 
> was that redundant?  Would putting that t1 point on only one image or the 
> other have been more then enough?
>

Donald, A total of three t1 points spread over the entire panorama width 
should be enough. There is no point in duplicating t1 points on the same 
feature in overlapping images.

Do some tests of your own: remove all t1/t2 points and deliberately make 
the panorama grossly unlevel.  Then try the effect of optimizing with just 
two t1 points assigned to various pairs of vertical edges and see how well 
they work.  Then try three or more.

John

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