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Time remapping clip and tracking null

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Nicolas Guionnet
Time remapping clip and tracking null
on Jul 26, 2020 at 10:56:01 pm

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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Chaz Chester
Re: Time remapping clip and tracking null
on Jul 26, 2020 at 11:02:12 pm

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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Nicolas Guionnet
Re: Time remapping clip and tracking null
on Jul 26, 2020 at 11:10:00 pm

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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Nicolas Guionnet
Re: Time remapping clip and tracking null
on Jul 26, 2020 at 11:25:15 pm

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);


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Chaz Chester
Re: Time remapping clip and tracking null
on Jul 26, 2020 at 11:36:47 pm

....or that. Glad you got it figured out 👍


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Chaz Chester
Re: Time remapping clip and tracking null
on Jul 26, 2020 at 11:35:54 pm

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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