"The idea is to choose significant points, simple to position:
top points, corniche, angle… No need to add thousand of
points, 3 or 4 might be enough for a 2-pictures panorama.
You’ll be always able to add more later if necessary.
"So, I place my first point on the left picture: I chose the top
of a roof. When you click to position a point, it automatically
zooms and you can refine the point’s position: