Closest and the farthest points for surface attach

[DennyTX]

Gentleman, does anyone know how to get x/y/z coordinates (regarding to part's CoM) of the closest and the farthest points that possible for the surface attach (in partmodule)?

While in part i need to know this range about parent.

also, what  this means:

            part.partInfo.partSize;
            part.parent.partInfo.partSize;

returns 2.12319183f for Mk1pod. 

what  this figure means? but its size:diameter 1.25 and 1m tall

 

Thanks for your time.

Edited January 6, 2016 by DennyTX

[sarbian]

partSize is the diagonal of the cube that englobe the part. 

For the surface attach I don't know.