That is such a useful script thank you!
Just so I know what is the way you would do it manually with out it?
I know if you have a camera parented to the null you can parent the 3d layer to the null and 0 out the xyz position but it some times does not work when you have moved the Z position on the camera layer?
That way also does not work if you have a null with the XYZ positions separated as i do in my current project.