If your getting an fbx with an existing offset from an app like maya, then shouldn't you need the offset in distance, not pixels? Maya's filmback offset is measured in inches.
-deke On Mon, May 2, 2011 at 06:24, John RA Benson <[email protected]> wrote: > width = 1998 > > lens > offset > calculated offset from camera u > > (-u/2)*width > > calculated u from offset > > -1*(2/width*offset > > win_translate.u (from camera fbx file) 20 -24 -18.34 0.024 > 0.01835662 23.1 -24 -5.34 0.024 > 0.00534497 24 -38 -29.04 0.038 > 0.02906466 24 -24 -18.34 0.024 > 0.01835662 35 -30 -22.92 0.030 > 0.02294578 > Strange - something funny with our fbx conversions then? Or maybe the > win_translate isn't the filmback offset? > I would have thought the values for offset and calculated offset would be > the same, and the actual win_translate.u and the calculated u would be the > same. > the actual offset for the first shot is -24 pixels and the win_translate.u > = 0.18, yet the calculated u is 0.024. > > The 2 cameras with offsets of -24 both had a u of 0.018, but by using these > calculations it should be 0.024. I'm not sure what's correct... > > jrab > > > Deke Kincaid wrote: > > u would be: > -1 * (2/width * offset) > > v would be: > ((root.format.h/root.format.w)*2)/root.format.h * offset > > > -deke > > On Thu, Apr 28, 2011 at 14:26, John RA Benson<[email protected]> > <[email protected]> wrote: > > > While we're on the subject of cameras and a little matrix math - > > does anyone have the math for converting pixel values of the offset of a > filmback into the window u value for the camera? > > Say I want to offset the image by 15 pixels, I'd need to adjust the window u > by ... ? > > thanks! > JRAB_______________________________________________ > Nuke-python mailing > [email protected]http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python > > _______________________________________________ > Nuke-python mailing > [email protected]http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python > > > > _______________________________________________ > Nuke-python mailing list > [email protected] > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-python > >
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