[Closed] HELP measure in percent closeness to predefined pose

hi everyone
i need some help with a code
im trying to get in percent value
how close a set of objects are to a predefined position

what im trying to do is :
i have a basic joystick gui setup fore a facial rig
and i want to connect the value of how much the rig is close to a predefined pose
to a morph target , and potentially to a texture opacity value

could really use your help on this one