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easily correct a wandering 2D track point

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Graham Macfarlane
easily correct a wandering 2D track point
on Nov 20, 2012 at 5:49:01 pm

In Syntheyes I can’t see how one can easily correct a wandering 2D track point.
Lets say I track the corner of a window. By frame 100 it losses the corner, so on this frame I move it back on target, but even if I track backwards I see a jump in tracker position on or near the frame I moved it.

I’m used to Matchmover which deals with this problem very easily. After setting the correcting keyframe a simple re-track (backward in this particular scenario) will smoothly interpolate between keyframes for the tracker point.

Thanks

Graham Macfarlane
3D animator and VFX specialist
London UK


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Graham Macfarlane
Re: easily correct a wandering 2D track point
on Jan 14, 2013 at 7:26:45 pm

I dug deeper into the help files and online tutorials and now understand better how Syntheyes works in comparison to Matchmover.

The concept of tracking backwards is not how syntheyes works for smoothing out corrections in tracker position. Simply, one has to set the Key smooth parameter in the manual tracking dialogue to a suitable positive value so that after making a correction for tracker drift the tracker will first go back this number of frames and smooth out the trajectory leading to the adjusted position from the previous keyframe before continuing with the normal tracking.
It is also advisable to Set the view to “Camera & Bottom Simultack” so thumbnails will appear for each keyframe placed, which allows you to visually see what is going on better.

A Useful tip that took me a while to discover:
If keyframes need to be deleted, one needs to go to the graph view, however if the Keyframes parameter (in the manual tracking panel) is not set to zero then deleting a keyframes can result in the keyframe being regenerated immediately (making you think there is a bug in the software or that you are going nuts!!)

Hope this helps someone!

Graham Macfarlane
3D animator and VFX specialist
London UK


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