I was wondering if there is a way to use a 3d object position in the compositor.
Basically it would be like the track position node, just instead of importing data of a tracker, I would like to use the data from an empty object directly from the 3d viewport.
It would be very useful to bring 2d elements in a 3d render in post.
Object location in world space is not defined in camera view space, so you cannot get a position value. You can get UV for surface and Z for depth/occlusion in camera view. But that wouldn’t help attribute location.
Perhaps render out a fast Open GL of the scene, then track that in the MCE?