Adding horizontal lines to at least a few images should do most of the trick 
(just add a control point pair with both control points at the sea level in the 
same image). Hugin now knows what is horizontal.

...and then you need to choose a projection that makes horizontal lines end up 
horizontal. Cylindrical should be fine. Alternatively in the panorama viewer 
you can drag the image to the point that makes this specifoc horizontal line to 
be projected as a straight line.

Kind regards,

    Gunter.



Am 16. August 2021 01:35:17 MESZ schrieb "David W. Jones" 
<[email protected]>:
>I have a sea horizon I shot from shore, handheld. No matter what I do, 
>the horizons on different images tilt different ways. I've tried using 
>the Assistant (it fails to find control points on one of the images, but 
>when I add control points, there's no improvement). I've tried using 
>horizontal lines on the horizons for each image, things still end up all 
>over the place. Using the Straighten button makes part of it a curve, 
>then it turns into tilted horizons again.
>
>I've tried adding vertical lines on each image at right angles to the 
>sea surface. That just started throwing images around in weird vertical 
>places.
>
>It's situations like this that really makes me wish Hugin had a "Find 
>horizontal lines" function...
>
>Using Hugin 2020.0.0.2f576e5d5b4a on Debian Linux.
>
>Ideas?
>
>-- 
>David W. Jones
>[email protected]
>wandering the landscape of god
>http://dancingtreefrog.com
>My password is the last 8 digits of π.
>
>-- 
>A list of frequently asked questions is available at: 
>http://wiki.panotools.org/Hugin_FAQ
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