On Sun, 22 Jun 2003, Alfonso Bresciani <email@hidden> wrote:
=========================================================
What would be an easy way to set up
the shooting around a car at 360 degrees?
(36 images every 10 degrees)
I've read before on the list about
using a gps.
Another problem would be that the car is not round
either...the circle around the car should be an ellipse.
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Hi, Alfonso!
See the topic "A crazy idea?" by Bruce Hemming, Thursday May 29, 2003, and
the ensuing posts over the following several days on this list, for a fairly
thorough discussion of your question.
RE: GPS
--------
The civilian limits (as opposed to military) on GPS accuracy would be a
limiting factor here. I believe it was Peter Murphy who suggested a radius
of 150 feet was the minimum "resolution" using GPS for object movie
purposes.
Ellipsoid vs. Circular
-----------------------
One wrinkle not covered in this discussion was an ellipse vs circle. A
properly established radius for a given car model would work well with a
circle (though a "whale" with dimensions of a 1959 Chrysler "Imperial" might
challenge this postulation). Even using an ellipse would still not make
every image equidistant from the rectangular shape of a car; nor does the
ideal of equidistant images strike me as necessary - again assuming a
properly established radius to begin with.
It would also appear that trying to calculate the ideal spacing between
shots would be very problematic. You can't rely on a simple "360/number of
shots" to give you your degree spacing as you can with a circle. The long
axis of an ellipsoid would have greater physical spacing between shots for a
given degree of separation than the short axis - making the images jump
assymetrically as you panned the object VR.
I haven't actually tried this set-up, but I have done a simple diagram of an
ellipsoid in Illustrator which demonstrated this situation. No doubt there
is a mathematical solution to give you the correct spacing for a smooth
panning object VR, but the whole ellipsoid proposition seems unnecessary -
at least for the dimensions of today's automobiles.
-- Jim Scott
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