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Mocha tracking limitation?

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Greg Jackson
Mocha tracking limitation?
on May 19, 2012 at 6:37:11 am

I need to add a vertical element in post (AE CS5) to a video.

The video is of a flat sheet of white paper lying on a brown table. The camera tracks around the table with plenty of perspective. There are not vertical planar surfaces/features to track, only horizontal ones.

In mocha (2.5.2) I can easily get a solid track so that the planar grid and surface stick well to the flat paper.

The vertical element to add is another sheet of paper standing on its edge on or near the flat paper on the table. This needs to be added in AE (otherwise I would have simply tracked all this in Matchmover and rendered off the element in 3D max)

In AE, my vertical paper layer is linked to a null loaded with the corner pin or transform data from Mocha. The result is close but there is something very wrong with the scale. As I play the video in AE the vertical paper gets much smaller than it should. I can counter this scale issue with another null but it would be rather tricky as it’s not a linear scale change.

Note: using the exact same tracking data from mocha in AE I can place a graphic on the flat paper on the table and it sticks well with no noticeable scaling problems.

Thanks in advance for any ideas on getting this track to work, or if perhaps it’s simply not possible with mocha!


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