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Move effect after motion tracking?

New Here ,
Aug 02, 2023 Aug 02, 2023

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Hey folks,

so I want to track 2 Bulge effects to the eyes. Now the center of the eyes is too dark to track so I have to use the outside of the iris. But then after I apply the tracking to both of the BulgeFX it changes the Bulge center to where I tracked.

How would I still be able to have the bulge in the center of the eye even tho I tracked the outside?

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LEGEND ,
Aug 02, 2023 Aug 02, 2023

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You apply the tracking data to a Null and then reference that Null in the effect's point control, where you simply can add offsets to your expression and/ or add another expression point control that provides the offset. Whatever works.

 

Mylenium

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Community Expert ,
Aug 02, 2023 Aug 02, 2023

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If you are using AE's tracker, expand the Feature region (the inside rectangle) to cover the entire eye and ensure the Feature Center is in the middle. You might be better off using Mocha AE to track translation only for the eyes. Draw a spline around the eyes, then turn on the Surface tool and make sure that the center cross is right in the middle of the eye. When you extract the transform data, the null or the layer's anchor point will be exactly where the Mocha Tracker's surface tool's center is located. You will probably get a more accurate track in Mocha, and you can also track rotation and scale, which will help you accurately track head movement. 

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