On Thu 15-Apr-2021 at 12:11 -0700, Sean McHone wrote:
I'm using Hugin to align images from multiple cameras. Secondary
cameras are mounted at a known offset from the primary camera.
I'm trying to use TrX, TrY, and TrZ to account for those offsets.
Could someone tell me what the units are for those translation
variables? Do those translation variables relate directly to the
position of the secondary camera's entrance pupil relative to the
primary camera's entrance pupil?
Yes, imagine that the output canvas is a projection screen and that
each photo is being projected onto this screen from a position in
space defined by these TrX, TrY and TrZ coordinates.
The default 0, 0, 0 location is exactly 1 unit distance from this
screen. So, if you change TrZ of a photo to -0.5, the 'projector'
is moving closer to the screen, and the image in the canvas view is
half the size. If you set TrZ to -1 then the projected image is so
small that you can't see it (the output canvas viewpoint always
stays at 0, 0, 0)
A photo with an angle of view of 90 degrees placed at 0, 0, 0 will
project an image onto the screen 2 units wide. A similar photo
placed at TrX = 2 will be shifted just far enough that the two
projected images sit side-by-side.
Hope this makes sense, it is a bit of a boggle, I suggest you open
the Preview window, set output projection to rectilinear with a wide
angle of view, and try moving the position of a photo around as
described above.
--
Bruno
--
A list of frequently asked questions is available at:
http://wiki.panotools.org/Hugin_FAQ
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