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Camera flat facing 3D object in 3D motion tracked footage

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Jose Carrillo Cabrera
Camera flat facing 3D object in 3D motion tracked footage
on Mar 23, 2018 at 5:56:44 pm

Hi there,

First post ever in the forum, would appreciate a lot your help because I can't seem to find a solution to something I want to achieve.

I have a shot taken with a drone that is just rotating in the air. I have used the motion tracker to generate a camera and tracking points to attach some text/objects to. The issue is trying to make these objects face flat to the camera at all time. The Layer:Transform:Auto-Orient doesn't seem to work, of course, the generated camera is not really moving, its just simulating the footage perspective!!

2D tracking is not an option. I want the objects to exit the screen naturally, as they would do if they were really integrated in the shot.

Can this be done??

Any help would be awesome. Thanks!!!







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Eric Santiago
Re: Camera flat facing 3D object in 3D motion tracked footage
on Mar 23, 2018 at 7:39:45 pm

use the 3D tracker option.

If the points don't come close, you can just set up close by but preview first.


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Cassius Marques
Re: Camera flat facing 3D object in 3D motion tracked footage
on Mar 23, 2018 at 7:47:24 pm

Paste
C = thisComp.activeCamera;

V = C.toWorldVec([0,0,1]);
P = toWorld(anchorPoint);
lookAt(P, P + V);

At the layers orientation to make them flat to the camera.

You could also map a 3d position to a 2d one. Pasting this to a position of a 2d layer:
a=thisComp.layer("reference null");
a.toComp(a.anchorPoint)


Cassius Marques
http://www.zapfilmes.com


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Jose Carrillo Cabrera
Re: Camera flat facing 3D object in 3D motion tracked footage
on Mar 28, 2018 at 10:37:26 pm

The 3D position to 2D expression worked like a charm. Couldn't make the orientation one to work, I am not good enough at expressions. Thanks Cassius!!!


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