Marten, Thanks for the reply! I was afraid of that. Oh, well… ;^) And, thanks for the link to Polytools - I'll definitely check them out! The first thing I plan to try, though, is to see how much luck I have extending the mesh with the new ModelBuilder node. I used it for a photo of a house that I wanted to model and re-project and it worked pretty well. This may be a bit more challenging, since the glacier and rocks have a ton of craggy detail, but maybe I can cheat (a lot)! ;^)
Thanks, Rich On Feb 27, 2013, at 2:48 PM, Marten Blumen <[email protected]> wrote: > Mesh edge clipping is normal - you can use GreyAngle's Polytools, PolyEdit to > extend the edges. > > http://greyangle.com/nuke/docs/geometry/PolyEdit.htm > > > On 28 February 2013 08:08, Rich Bobo <[email protected]> wrote: > Hey all, > > I've finally had a chance to start messing around with the new > PointCloudGenerator node. I'm hoping some of you with more experience in this > area can help me with a couple of things that I don't quite understand… > > The main question I have deals with point coverage. I have a test clip I'm > using that is shot from a boat, looking onshore at some glacial ice, with > rocky mountains in the background. I can get a lovely CameraTrack, thanks to > all of the available points to track. The parallax is good as the boat moves > up and down and goes slowly past and around the glacier ice. In the > PointCloud Generator, I've tracked points and get a pretty good lock with > points on the foreground ice and on the background rocks. However, I do not > get full coverage of points in the shot. For example, the foreground ice is > truncated on the left hand side at the beginning of the shot (the boat moves > from left to right across the scene, so the footage moves from right to > left). Also, as the boat bobs up and down, it reveals more truncated points > at the top. I never lose coverage on the right of the frame, however. I can't > tell what's happening on the bottom of the frame, since I am masking out the > water that is there. I'm guessing that the lack of coverage on the left > probably has to do with the fact that there are no prior frames to look at > for parallax reference. But, still, a regular camera track seems to have more > coverage. I can't quite wrap my head around this. Can anyone explain it to > me? And, is there a way to do the analysis to get greater point cloud > coverage…? > > I watched the demo video that Steve Wright put together - > https://vimeo.com/54931986 - and his mountains clip happens to be very > similar to my test clip. Looking at his result, I can see that he is also > getting the same sort of clipping - not getting complete coverage of his > scene. So, maybe the rest has to be hand modeled after a mesh is generated? I > mean, in order to do a projection on a mesh derived from the point cloud, > you'd absolutely have to extend it. Is this always a manual process…? > > Thanks for any help! > > Rich > > > Rich Bobo > Senior VFX Compositor > Armstrong-White > http://armstrong-white.com/ > > Email: [email protected] > Mobile: (248) 840-2665 > Web: http://richbobo.com/ > > "I have long been of the opinion that if work were such a splendid thing the > rich would have kept more of it for themselves." > - Bruce Grocott (1940 - ) > > > > > > > _______________________________________________ > 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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