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How can I reverse and calculate a position of a null object?
I have a motion track with three trackers (objects get obscured or move off the screen, so three trackers are needed)
I’ve applies the X and Y to three chained nulls respectively, and the third null follows the scene perfectly.I would like to adjust the anchor position of the original video by the position of the third null, but don’t know what value to pick-whip. Even though the object itself follows position via parently, there is only variable position data where the track itself was applied. Otherwise pick-whipping the null position does nothing, since technically it doesn’t move.
What I really want is to know how to use my existing multiple track points to stabilize the shot without losing position between trackers. I put a lot of time into manually fine tuning my motion trackers, so I’d like to reuse them if possible rather than re-do all that work. Perhaps there’s an expression to read the null’s parented position and apply that somehow?
I tried re-using my track points applying a stabilize instead, but wherever the stabilize goes from one tracker to the next, the whole frame jumps to a new position and then remains stable from there.
Any help would be appreciated!!
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2 Replies
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offset tracking
https://library.creativecow.net/articles/larsen_carl/analyzing_motion.php
child tracking with expressions pt 1
https://library.creativecow.net/articles/larsen_carl/child_tracking.phppt2
https://library.creativecow.net/articles/larsen_carl/child_tracking2.phphttps://technicolorsoftware.hostzi.com/
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Or you could download a really great script from
https://aescripts.com/trackerviz/It’s a bit fiddly.. but would really help you !!!
make sure you watch the vid as well !!!
Alex
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