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Apply Tracking Data to Masks?

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Dan Oster
Apply Tracking Data to Masks?
on Mar 5, 2010 at 12:43:20 am

Hey, folks. I have some tracking points on a green screen that I need to mask out (stupid color choice), but the camera is hand-held and moving throughout the piece.

Is there a way to mask out each point, track the motion, and apply that data to my masks so they follow the tracking points? Then I would just need to adjust for when the actors cross in front. It would make my life a lot easier...

As always, thanks for ANY help!

- Dan


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Todd Kopriva
Re: Apply Tracking Data to Masks?
on Mar 5, 2010 at 1:39:02 am

You can apply the tracking data to a solid-color layer with your masks applied and use that layer as a track matte.

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Todd Kopriva, Adobe Systems Incorporated
putting the 'T' back in 'RTFM' : After Effects Help on the Web
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If a page of After Effects Help answers your question, please consider rating it. If you have a tip, technique, or link to share---or if there is something that you'd like to see added or improved---please leave a comment.


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Dan Oster
Re: Apply Tracking Data to Masks?
on Mar 5, 2010 at 9:59:21 am

Thanks, gentlemen. This forum is always a great help!

Todd, can you take more through your suggestion in a bit more detail? This involves the TrkMat menu I assume?

- Dan


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Todd Kopriva
Re: Apply Tracking Data to Masks?
on Mar 5, 2010 at 3:03:00 pm

> Todd, can you take more through your suggestion in a bit more detail? This involves the TrkMat menu I assume?


More information on track mattes in general and on rotoscoping (which this is a kind of):

"Track mattes and traveling mattes"

"Rotoscoping introduction and resources"

---------------------------------------------------------------------------------------------------------
Todd Kopriva, Adobe Systems Incorporated
putting the 'T' back in 'RTFM' : After Effects Help on the Web
---------------------------------------------------------------------------------------------------------
If a page of After Effects Help answers your question, please consider rating it. If you have a tip, technique, or link to share---or if there is something that you'd like to see added or improved---please leave a comment.


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Dan Oster
Re: Apply Tracking Data to Masks?
on Mar 8, 2010 at 5:42:17 am

Seems simple enough. Thanks again for the help!

- Dan


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Illya Laney
Re: Apply Tracking Data to Masks?
on Mar 5, 2010 at 2:55:13 am

Or you could clone out the tracking points.

Motion Design, Color, Editing
Simulated Wood Grain Cabinet Inc.
Bunim-Murray Productions


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Rob Webster
Re: Apply Tracking Data to Masks?
on Mar 5, 2010 at 5:36:15 am

Check aescripts.com/tracker2mask. It seems like this script would do what you're looking for. Or check out aescripts.com/maskstolayers. It seems like this would move a mask to a layer (as a normal solid, I suppose?) and you could then parent that layer to a null that has the tracking data. This layer could then be used as a track matte to mask out your tracking points.



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Joey Foreman
Re: Apply Tracking Data to Masks?
on Mar 5, 2010 at 6:57:04 am

I believe the method that Todd stated is pretty much the standard; and deservedly so for its simplicity and effectiveness, the others involving unnecessary steps. No nulls or expressions needed.

A null would come in handy if you needed to match motion to a layer offset from the position of the tracker, and an expression would be the ticket if you wanted to give it some drag, gravity, random wiggle or whatnot.



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