Export a null to obj

I need to export joint animation to simple coordinates, for a programmer to use. My idea is to make a curve point or a locator at each joint and export as an OBJ sequence.

How do I export a null locator, or curve point to an OBJ? I tried curves and locators, but they dont work.

Thanks!

This is a 'hack' mind you, but you could use actual curves or geo. I had to do something similar long ago, and I ended up making tiny cubes instead of locators. Assuming your engineer only needs the transform node positional data, they should be able to grab that from the cubes and not render them.

Sorry not the full answer, but maybe useful if you are in a bind?
K

Just a shot in the dark, What about motion trails? I was thinking like motion trails and point on curve stuff. Just a thought.