I want to make an object constrained such that it is always between another object and the camera. In other words, I want the constrained object to eclipse another object in relation to the camera, and always be eclipsing it no matter where the eclipsed object moves. I would think one of the constraints would do this, but I’m not sure which and how. Anyone know?
I would do it like this:
Move the Root bone to move the camera.
Move the IK-Target bone to move the cube.
Camera stays pointing at the cube, sphere stays in the path to the cube at a constant distance from the cube. :yes:
here’s the blend file:
eclipse.blend (516 KB)
Cheers, Clock. 
PS You might want to shrink the sphere a little if you are in camera view, it totally obscures the cube as it is!
Damnit I have to learn rigging now.
Thanks clockmender!
Guess you’re right there!
Just ask here if you get any problems.
Cheers, Clock.