You can export undistorted photos from photoscan and use that directly in Nuke
from memory: tools->undistort photos Misho On 12.05.2014 23:07, Nathan Rusch wrote: > I think one of the 3DEqualizer distortion models is based on the Brown model. > If that's the case, there's a good chance you can use their distortion plugin > to get the same result. > > Details here: > > http://www.3dequalizer.com/index.php#?site=tech_docs&id=110216_01 [1] > > -Nathan > > -----Original Message----- From: Schneider, Abraham > Sent: Monday, May 12, 2014 5:25 AM > To: Nuke user discussion > Subject: [Nuke-users] Photoscan lens distortion in Nuke? > > Hi there! > > I'm just playing around with Agisoft Photoscan > (http://www.agisoft.ru/products/photoscan/standard/ [2]) to deal with a large > set where I have to do some CG additions in several shots. Most of the shots > are with locked camera. So having a rough temp model of this outdoor set (big > square with some buildings surrounding it) would be really helpful to > correctly position the CG buildings. > > Reconstructing the set with Photoscan from my DSLR images worked quite nice. > The resulting model should be more than enough to help creating these shots. > My idea now was to add single frames from each of my locked camera shots > (ARRI Alexa) into Photoscan, align these images as well and export the found > camera positions with the model and use these virtual cameras for my > renderings. > > Problem now is: to align all the images, Photoscan uses an complex (?) lens > distortion algorithm and undistorts all images before doing there alignment. > So the undistorted images match fine to the model from Photoscan. But to do > my comps, I'd have to it the other way around: distort the CG renderings and > merge them with my original Alexa footage. So I'd need a node in Nuke to > apply the same lens distortion as Photoscan does. I get the values from > Photoscan, but which node can I use to do the distortion? > > I think, Photoscan uses the same model as they use in their free lens > distortion software: http://www.agisoft.ru/products/lens/ [3], which mentions > a 'Brown's distortion model'. Anyone of you knows if there is a node in Nuke > (or Nukepedia or so) which uses the same algorithms? Or any other idea? > > Thanks, Abraham > > Abraham Schneider > Head of VFX pipeline / VFX Supervisor > > Türkenstr. 89, 80799 München / > Phone +49 89 3809-1096 > > EMail [email protected] > > Visit us on Facebook!________________________________ > > ARRI Film & TV Services GmbH > Sitz: München Registergericht: Amtsgericht München > Handelsregisternummer: HRB 69396 > Geschäftsführer: Helge Jürgens, Josef Reidinger > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ [4] > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users [5] > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ [4] > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users [5] Links: ------ [1] http://www.3dequalizer.com/index.php#?site=tech_docs&id=110216_01 [2] http://www.agisoft.ru/products/photoscan/standard/ [3] http://www.agisoft.ru/products/lens/ [4] http://forums.thefoundry.co.uk/ [5] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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