PanoTools:
Re: Very Large Objects (was: Panos of an active-duty C-47D airplane (military version of DC3))
Carl von Einem 2005-Sep-18 15:10:07
From: Carel Struycken <#removed#>
>
> For the outside shot a giant "3D object rotation" would have been nice
> ;-) I have been planning an experiment for such a thing, using a
> transparent flexible tube with colored water (or red wine) open and
> turned upward at both ends, which would serve both to keep a steady
> distance and as a level to shoot all images at the same hight.. Dont
> know if it will work...
That kind of level is called "Schlauchwasserwaage" (tube level?) in
german, you just don't need coloured water for that but an assistant to
plug/unplug the other side during transportation of one end. Otherwise
you will loose liquid and then you have to recalibrate that system. I
have one of those exactly for that purpose but normally it is used to
level things over long distances or between rooms where there is no
direct visible connection between two points (e.g. for building a nicely
levelled floor). If you use red wine go for a silicon tube as that won't
add something to the taste.
But that is only one part of the game: you need to divide the
surrounding circle or ellipse in equal arcs, preferably 36 (so every 10
deg.) or even 72 to get a very smooth object movie. To be able to shoot
fast enough first mark every spot on the ground with e.g. chalk: sun
moves quickly and that may be a problem for the transition between your
first and last frame.
next step: something that helps you to accurately position the lens in
the right direction (the center of your object). For a plane I suggest
to position a light stand with a tennis ball on top of it at camera
level where axis through the cabin and the wings cross, don't forget to
mark that spot on the ground. Astronomical telescopes have a second
little lens, something like that might work. Or exchange the wide angle
lens with a tele to aim your camera at the tennis ball, than exchange
lenses, put away the target tennis ball and shoot. You will need an
assistant for that, so bring enough wine for two.
Carl
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