3D moving objects tracking

Hey guys!

I need to attach a halo (a Nimbus) at the head of the girl in the video. The camera does NOT move (it is stable), but the girl moves, shakes, twists and turns the head. I just need to put the Halo on the head of the movement. I found a number of tutorials, but all learn them to track the camera motion, but not a displacement of the subject while the camera is stable as in my case in 3D. Could you please be kind enough to suggest how to solve this problem?

Thank you in advance!

OK, I played with the images for a few minutes and I could come up with the solution the simplest was to first set the images to bring out more detail in the hair that I could, then I indexed to remove the background. The nest step was to use AE Tracker to follow the movements of the head to the right where the hair is separated.

When the track was good, I added a null value of the Tracker to the comp and applied monitoring of the null value. A 3D solid has been added and upwards to the line at the top of the head using x y and z rotation and perspective to the eye while the aircraft aligned with the top of the head and looked like he was cracking the head. The null tracker was made 3D and I related the 3D solid to the Tracker. I then animate the X Y and Z rotation selection points where the direction of the movement has changed. The film was also 3D. I have added a camera to the scene to serve later. It wasn't that many keyframes to attach solid pink head and give the impression that it was attached.

The entire model can then be exported to C4D and if you replace solid pink in C4D with your halo you should be good to go.

Unfortunately, because of the way the shot is framed, it has no practical way to do Camera Tracking in this photo.

If you have a budget, you can follow this picture in the syntheses and build a 3D model of the head of the trail, then combine all this information in a 3D application like the full version of C4D and insert the halo there. AE is just not up to do everything automatically with it's built in tools.

Tags: After Effects

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