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tyroneerose617
Inspiring
June 18, 2018
Answered

3D Tracking Object Moving too Much

  • June 18, 2018
  • 1 reply
  • 3653 views

Hello

I have added a link to the footage to help understand my problem. I shot this footage very quickly because I wanted to try out using 3D objects, the polaroids are PSDs that have been turned into 3D objects. I have used 3D camera tracker on the video footage to track the points. I have also used warp stabilzer on the original base footage. I am not sure how to make the floating polaroids more still, I am guessing it has to do with the tracking? Does anyone have suggestions, I am brand new to 3d tracking but want to learn more!

Thanks

Tyrone

3d track karli photo.mp4 - Google Drive

Correct answer Mylenium

AE's 3D tracker is uncalibrated and doesn't allow manual placment of tracking points. You would have to use other tools for that. How to set up tracking markers can easily be learned by just watching a "making of" of an effects-heavy film or searching for tutorials. Again, you can't "fix it in post", at least not with just AE. As far as placing track markers in itself goes, it doesn't really matter where they are as long as there are enough distinct ones and they have a minimum of visible motion from frame to frame. Ideally one would place two or three dots near the camera as a reference for the parallax and then a whole lot of other dots elsewhere in the scene at positions where they can easily be painted out/ covered up or replaced with CGI-rendered stuff. None of this is really complicated, it just requires a basic understanding of how perspective and the math employed to solve 3D tracks work plus proper preparation of the shot to begin with.

Mylenium

1 reply

Mylenium
Mylenium
Braniac
June 18, 2018

Well, straight to the point: That's a nonsense workflow. You cannot use warp stabilizer and then hope it would generate a stable track. It merely disguises jittery pixels by synthesizing new ones. In turn that means that you track and smooth out the tracking data first before any further manipulation of the footage. Aside from all that your footage is likely to always "swim" because there is not enough distinct parallax information. Too many large areas with barely any feature patterns. Prepping a shot is just as much part of the game and you have to put up some markers´.

Mylenium

    R
    Rick Gerard
    Braniac
    June 18, 2018

    What Mylenium said. If you want to do 3D tracking you first need to learn the principals of 3D tracking, carefully plan the shot, make sure any lens distortion and rolling shutter problems are solved, then run the 3D track, then do the composite, then if you must pre-compose the entire thing or render it and run warp stabilizer to smooth out the camera work. It absolutely will not work well if you try and warp stabilize first or guess at removing lens distortion.

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