I was going to make a suggestion as well, maybe for a future issue but I know Mary Poplin has a tutorial that I think addresses this as well with a single track.  Basically, it was a track for a person's eyes and when they blink of course, it goes to hell.  She simply tracked to that point, then during the blink frames, she literally moved the entire mask somewhere else which maintained it's form, then once the eye was back open, she placed it back on the eye.  I'd say this is the same as your beams, except then during those 2 frames or so, you could do those manually in AE with ease I'd say.  I've used the technique.

Just a thought.

Eric

On Thu, Sep 12, 2013 at 2:32 PM, Teddy Gage <teddygage@gmail.com> wrote:

     Okay I think I figured it out if anyone is interested. It was a good problem I think, it's going to make me better at mocha.  I had to rewatch a couple of tutorial videos before I got it. While using adjusttrack, I was trying to keyframe the actual four planar surface corner pin points (the "poster corners") instead of the adjustrack tracking points themselves in order to compensate for the distortion caused by the cement beams passing in front of the camera. I was trying to reset the "master" keys for adjustrack every time I wanted a change, not realizing it was the tracking points that needed to be realigned, but that they can only be accessed if you are working in the adjustrack tab.

Also, those keys I wanted were already being created automatically when I realigned between obstructions. Before I was playing whack a mole every time I made a change. The track between obstructions isn't perfect but I can massage the keyframe data in AE, and it's all already synced. Additionally, I had to reset the anchor point on the imported keyframe data so it all is brought in for tracking as opposed to stabilizing. Took me a while to figure that out too. Anyway, that was probably clear as mud, but maybe it will help someone. Mocha is amazing, but it's definitely a different paradigm.

TG

On Thu, Sep 12, 2013 at 11:50 AM, Teddy Gage <teddygage@gmail.com> wrote:

Hello, I have a very difficult tracking shot of a car that gets completely obscured by a barrier for several frames during a tracking sequence, throwing off the mocha tracking data. This happens about six times during the shot. Now i could make make seven different tracking layers (ie a new layer between barriers each time) but this is tedious and makes syncing up the track data in ae very time consuming. Id prefer to do it all on one layer. Do I switch to a manual track during obstruction? Even adjusttrack cannot seem to compensate, as the entire object is obscured. Trying to track the barriers separately to exclude from the search area doesnt work very well either. Are there any tutorials about this? What would be the best way to approach this? Many thanks,

TG

--
Animator & Editor
www.teddygage.com
Brooklyn

--
Animator & Editor
www.teddygage.com
Brooklyn

--

Eric D. Kirk | Kirk Productions

The Night Visitor | VFX

443.206.1347
www.kirkproductions.com
kirkproductions@gmail.com

IMDB:  http://www.imdb.com/name/nm3351363/