2D Null tracked to 3D layer

[Roland R. kahlenberg]

Dude! You obviously have a complex issue to solve but your input here doesn’t provide much info. Perhaps an image link/post/embed here may help.

FWIW, I know that Syntheyes allows for manual tracks to be added once your 3D auto track is done. Perhaps you can try that and see how it works.

Cheers
Roland Kahlenberg
https://www.broadcastGEMs.com – Adobe After Effects project files
https://www.myspace.com/rorkrgbspace

[Darby Edelen]

I’m not sure if this applies to what you’re asking directly, but the way to translate a point on a 3D layer from the world coordinate system to the composition coordinate system is:

l = thisComp.layer(“My 3D Layer”);

l.toComp(l.anchorPoint);

This would translate the anchor point of the 3D layer to 2D composition coordinates.

Darby Edelen
DVD Menu Artist
Left Coast Digital
Aptos, CA

[Enots1]

I tested it and my solution is…

i) make both layer(tracked 2D Null, original shot) 3D layer.

ii) parent the 2D Null to original Shot.

iii) parent the original shot to the camera(I guess 3D tracked motion data is in this cam).

iv) reset the original shot transform
– anchor point (360, 243, -z) ; in NTSC D1, z is camera zoom factor
– position (0, 0, 0)
– all rotation to zero
– scale (100,100,100)*distance ; distance is the distance factor, in my case just 1,
you may need keyframes.

if all process is correct till here, you may see fixed(nothing happens to your preview)
shot and moving null, with your active camera view. But in other view you can see
the Null and the original shot move along in space.

v) if you want the absolute position data of the Null, make another 3D Null and make
expression in position.

L = thisComp.layer(“2D Null”);
L.toWorld(L.anchorPoint,time)
// this expression is in the tutorials of Dan Ebberts.

vi) convert this expression to keyframes in keyframe assistant.

that’s all, if I understand your situation right, it will work.