written by Mayec Rancel
Creates a point dummy, and parents it to the reference object's vertex/center,
using controller expressions.
This is useful to parent other objects to a specific part of a deforming
mesh, or an object whose transforms have been 'baked' (e.g. point cache).
I have found it specially useful, in FX work, for particle/fluid emitters.
- Only the 'center' method can be used with splines.
- When using 'vertex' method, the dummy's rotation will align to the