I have some panos that I want to stitch together, but being new to PTgui, I don't know how to fix this particular issue. Have seen it in Adobe as well trying to stitch. Several waterfalls together in a series. Each picture is vertical (water is falling DOWN). The stitched version has one of the falls vertical, but another one is very much off-vertical. Should I do a series of 2-picture stitches, then stitch another set (like a sports competition bracket)? I want to force certain pictures to have a particular "this is vertical" line and then force the other trees and rocks to stitch relative to those lines.