On Mon 21-Nov-2011 at 18:37 -0500, Robert Krawitz wrote:
On Mon, 21 Nov 2011 22:59:46 +0000, Bruno Postle wrote:
1.) Only the actual horizon should be assigned as a "horizontal
line" (unless you just want some line, or the average of some
lines, to be straight and at the horizontal center (equator) of
the panorama) because the horizon line is the only latitudinal
line that lies upon a great circle line (the equator.)
Yes, for spherical panoramas. Horizontal lines can also be
useful for removing perspective from façades of buildings, but
only when you are using rectilinear projection for the output.
What about equirectangular or cylindrical (or Mercator)?
In these projections the only features in the scene that will be
horizontal in the output image are: the horizon at sea, or features
of circular buildings (so long as you are standing in the exact
centre of the building).
--
Bruno
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