Hi Dan,

thank you very much for your quick reply! It almost works!

Now the Null orientates towards half way between 'b' and 'c', wich is almost fine. In my case 'b' and 'c' have different distances from 'a'. The angle between 'a'-'b' and lookAt and 'a'-'c' and lookAt gets kind of unequal.

What I need is an orientation where these two angles remain equal no matter where in 3D space 'b' and 'c' float...

Hope this makes sense - I attached a scribble wich might help to explain. Image B is what I'm looking for.

(Background: 'b' is a lightsource and 'c' is a camera. The orientation of a Null on 'a' drives a little masked solid on a fixed distance. That one mimiks the light's reflection on a sphere)

Thanks a lot!

Sebastian