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Time remapping clip and tracking null
Hi,
I have a clip.
In it, an object A is tracked.
The tracking target is a null, thus following A.
I need to remap the time of the ensemble … without having to re-track every time …1°) I tried to remap both the clip and the null, controlling the remapping with a slider control. No way. A null cannot be remapped, apparently.
2°) I tried to precompose the clip + the null.
When I try to remap the composition, the null ignores the remapping … and it stops following A.How can I do this ?
Is there a way to convert the tracking null to a normal moving object ?Thanks
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5 Replies
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You should be able to just pre-compose the footage (without any time remapping) and the null together and then time remap the pre-comp itself, right?
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OOOPPPs ! Wrong diagnostic !
You’re right Chaz … and in fact, it works ! ( Thanks for your answer ! )
BUT … I have another problem as an expression outside of the precomposed [ clip + tracking null ] tries to access the position of the null …
It seems that it only gets the position at the present time ( without the time remapping ).Is there a way to solve this ?
Thus, this post is now expression oriented … (sorry, wrong forum )
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I simply used this code to solve my problem :
yourTime=thisComp.layer("tracked-ball").timeRemap;
pos = comp("tracked-ball").layer("motion-tracker").transform.position.valueAtTime(yourTime); -
One solution would be to pre-compose the layer that has the expression on it and apply the same time re-mapping to that pre-comp. If the position data is staying the same (like, you’re not planning on re-tracking the shot or moving the null), you could could convert the expression to keyframes and then re-time the keyframes to sync up with your time remapping. You can easily scale the timing of several keyframes by selecting them and holding down option/alt while dragging the first or last selected keyframe from side to side.
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….or that. Glad you got it figured out ?
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