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pragmatic_user
Known Participant
October 9, 2021
Answered

add logo on moving shirt, which tracking method?

  • October 9, 2021
  • 2 replies
  • 3345 views

Hi, I've this quick video: https://www.youtube.com/watch?v=uapn1TvUAWM

Basically I've placed a yellow pin on the talent's shirt in the hope to replace it with a cgi graphic in post-production.

 

I suppose I should track the yellow pin, and then apply it to a null, and then parent the graphic to the null object.

 

But I've tried the after effects motion tracking feature with both transform and transform+rotation but it didn't take into account that the talent rotate on the z axis, and so the cgi graphic basically stays on a 2d plane, which is not realistic.

 

What tracking method (or anything else) would you use to complete this fx?

I heard that mocha is good with tracking, but before I start to learn something new I would like to hear if some of you had done similar job before.

 

Thanks.

 

 

 

 

This topic has been closed for replies.
Correct answer Ross_Shain

Here are a few links for Mocha Pro's PowerMesh tutorials. PowerMesh uses sub-planar tracking for organic or warped surfaces like skin or fabric. 

Depending on the footage it can be quite simple to complex to track a shirt's surface. 

https://youtu.be/C1j8mxTTOi4

https://youtu.be/dZE0d8w5M5c

https://youtu.be/KiG0mp-6K-I

 

 

2 replies

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Community Expert
Rick GerardCommunity Expert
Community Expert
October 10, 2021

For a shot like that adding a tracking mark is no longer the best idea. Lockdown is the righ tool for the job. Mocha Pro also has similar tools. You just need a little detail in the surface and you can add any graphic you want to the shirt. 

 

If you want to add a solid to the shirt that looks like a button I would use what I call the “Stabilized Power Pin” workflow. 

 

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pragmatic_userAuthor
Known Participant
October 10, 2021

thanks

Mylenium
Mylenium
Legend
October 9, 2021

Not much, really. Even assuming this originated as shiny 4k footage tracking the pin would be extremely difficult. If at all I would imagine you could get some result using a palnar perspective track in mocha, but really even this would be a struggle since the Pin simply has no real patterns on it and any such determination could only be made based on teh edges and crinkles of the paper. You are probably facing a lot of manual corrections, massaging the tracking data in mocha's graph editor and/ or adding extra keyframes in AE.

 

Mylenium

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pragmatic_userAuthor
Known Participant
October 9, 2021

ok thanks for the insight. I ended up doing it the old school way: frame by frame, positioning and scaling the graphic manually, using simple keyframes

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