About that Fxguide article: Anyone know off-hand why the focal length is derived from a half circle (arc) from the two vanishing points, and the center of the frame? Why is that the focal length? Everything else is intuitive to me but that.
Thanks, Small brain On Fri, Dec 6, 2013 at 3:12 PM, Howard Jones <[email protected]>wrote: > Any parallel lines? Find a vanishing point(s). Draw a cube from this and > add a 3d cube. Adjust length and rotation of the camera until the cube fits > the lines. Should give you your focal length. > > Howard > > On 6 Dec 2013, at 18:58, Elias Ericsson Rydberg < > [email protected]> wrote: > > Well, here I am thinking people live in the best of worlds. I agree with > previous posters, estimated positions of point will have to do. Eliminate > as many variabels as you can. Knowing, or estimating, the FoV is key! > > Cheers, > Elias Ericsson Rydberg > > 6 dec 2013 kl. 19:36 skrev Richard Bobo <[email protected]>: > > Elias, > > Unfortunately, the image was shot a while ago, in a remote location… > > Thanks, > Rich > > On Dec 6, 2013, at 1:24 PM, Elias Ericsson Rydberg < > [email protected]> wrote: > > Yeah, as soon as you've found out the field of view you can usually match > it quite well by hand. And as the previous poster said, knowledge of the > dimensions of a few objects will help a lot to get the right scale. > > If you've surveyed the 3D positions of a few points on set you could of > course create the same points in Nuke as axises (spelling?) and match > toward that. Reconcile3D would be very useful for that purpose. > > Cheers, > Elias Ericsson Rydberg > > 6 dec 2013 kl. 18:20 skrev John Mangia <[email protected]>: > > First thing I'd do is check if there's any EXIF data in the image from the > camera that shot it. It might give you an idea of the camera make, focal > length, etc. Which will also help you figure out the size of the > filmback. If there's a common object in the shot like a pen or street sign > you can use the known size of that object to help you figure out the focal > length and camera position. Hope it works out for you. > > > On Fri, Dec 6, 2013 at 12:12 PM, Richard Bobo <[email protected]> wrote: > >> Hi all, >> >> Anyone have any good methods for camera matching a single still image in >> Nuke…? >> >> Thanks, >> Rich >> >> >> Rich Bobo >> Senior VFX Compositor >> Armstrong-White >> http://armstrong-white.com/ >> >> Email: [email protected] >> Mobile: (248) 840-2665 >> Web: http://richbobo.com/ >> >> "Man does not live by a turkey in every oven or a color TV set in every >> home. Man lives by faith and hope and love, by the star on the horizon, by >> the trumpet that will not call retreat." >> - E. Merrill Root >> >> >> >> >> >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > > > -- > John Mangia > > 908.616.1796 > [email protected] > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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