hey hey Why not run your images though nuke first and undistorted there, then into photoScan.
Then all re distort images and CG in nuke. You could also use the point cloud or mesh from photoScan to create basic geo of the scene in nuke and solve all cameras from the alexa footage agains each other using this geo or point cloud. This should solve all of your alignment issues from shot to shot -adam On 12/05/2014, at 10:25 PM, "Schneider, Abraham" <[email protected]> wrote: > Hi there! > > I'm just playing around with Agisoft Photoscan > (http://www.agisoft.ru/products/photoscan/standard/) 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/, 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/ > 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
