victo160 0 Posted November 12, 2015 Hi! I tracked some footage in PF Track, and everything seemed good. My test geo didn't slip or slide around. I exported it as Houdini Script. Brought it into Houdini, trackers all showed up along with the camera. But when I put the image sequence into the Camera background everything is sliding. The trackers don't match up with the background. I don't think my track was as way off as it seems with the background plate. Is there another reason why background sequence and trackers wouldn't be matching up? Any information is great! Thanks! Share this post Link to post Share on other sites
bandini 126 Posted November 12, 2015 Many possible reasons... Could be any number of the following: frame-rate differences pixel aspect differences focal length not coming in correctly image sequence misaligned or not displaying in the correct pixel aspect Something messed up with the translation order of the camera Check all of these between the import and the PF Track files. Something must be different somewhere. 1 Share this post Link to post Share on other sites
cwalrus 11 Posted November 12, 2015 Also try simple stuff- check that the camera's resolution is corrrect on the camera node. Does it match your PF track file and your image sequece? Also check to see if your Image sequence is properly filling the frame, and not being stretched. 1 Share this post Link to post Share on other sites
Atom 1,230 Posted November 13, 2015 (edited) There is also the concept of the 'undistorted' plate. Which is how you should be working inside a 3D package. Many cameras introduce lens distortion into recorded footage. Most tracking software offers the option to correct lens distortion and output a new image sequence with undistorted images. You then use those undistorted images in your 3D package as your background. When you render out your finals without the background you will have to re-distort those 3D images to match the original plate, typically done in the compositor. Edited November 13, 2015 by Atom Share this post Link to post Share on other sites
cwalrus 11 Posted November 14, 2015 However, even if you did not 'undistort' your plate in PFTrack, your trackers will still appear to follow the backplate in Houdini, at least. (The problem will show up when you render) Share this post Link to post Share on other sites
