Converting position to "orbit position"

[PrivateFlip]

For a new mod I'm making I'm getting stuck on a technical hurdle.

I want to move a vessel to a location and orbit of the active vessel. The method FlightVessel.orbit.UpdateFromStateVectors() does almost exactly what i want.

Below the code for having the other vessel appear at some distance from the current vessel:

                FlightVessel.GoOnRails();
                FlightVessel.orbit.UpdateFromStateVectors(FlightGlobals.ActiveVessel.orbit.pos + offset, FlightGlobals.ActiveVessel.orbit.vel, FlightGlobals.ActiveVessel.orbit.referenceBody, Planetarium.GetUniversalTime());
                FlightVessel.GoOffRails();

FlightGlobals.ActiveVessel.orbit.pos gives me the position in relation to what I suspect from the size of the vector to be the celestial body.

FlightGlobals.ActiveVessel.orbit.pos
[-70687.4555733527, 696635.048411489, 31237.3830353896]

What I want to do is to have the other vessel arrive at a specific location in relation to the current vessel. For my mod a few meters in front of a docking port. To do so i have to convert the position of a part to an "orbit" position. How do I do this?

The world reference transform obviously does not work:

FlightGlobals.ActiveVessel.ReferenceTransform.position
(-1472.8, -6.3, -117.8)
transform.TransformPoint(position)
(-1472.8, -6.3, -117.8)

I've tried using transform of the celestial body, but no budge.

FlightGlobals.ActiveVessel.orbit.referenceBody.bodyTransform.InverseTransformPoint(position)
(-395082.6, 31237.0, -578106.6)
FlightGlobals.ActiveVessel.orbit.referenceBody.bodyTransform.TransformPoint(position)
(70264.6, -31249.6, -695713.4)

It should be doable I think. The vector FlightGlobals.ActiveVessel.orbit.pos is literally spot on (if i set the offset to zero, there are some awesome explosions). Just can't seem to convert another vector to wherever this orbit.pos is measured from.

Any suggestion on how to approach this?

[The_Duck]

Try

FlightGlobals.ActiveVessel.ReferenceTransform.position - FlightGlobals.ActiveVessel.mainBody.transform.position

or perhaps

(FlightGlobals.ActiveVessel.ReferenceTransform.position - FlightGlobals.ActiveVessel.mainBody.transform.position).xzy

Edited May 18, 2014 by The_Duck

[PrivateFlip]

Thanks! I'll try that.

EDIT: Tried it, this matches up perfectly.

Thanks The_Duck.

Edited May 24, 2014 by PrivateFlip