Never mind, I got it. Just had to rub my brain cells together a little longer than usual.
R On Fri, Dec 6, 2013 at 3:35 PM, Ryan O'Phelan <[email protected]> wrote: > 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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