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 - )
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