Maya: Closest Transform

mct.py

import pymel.core as pm

def ctr_dist(objA, objB):
    Ax, Ay, Az = objA.getRotatePivot(space="world")
    Bx, By, Bz = objB.getRotatePivot(space="world")
    
    return ((Ax-Bx)**2 + (Ay-By)**2 + (Az-Bz)**2  )**0.5

def get_closest_node(src, nodes):
    
    dists = []
    for node in nodes:
        dists.append(ctr_dist(src, node))
    
    index = dists.index(min(dists))
    
    return nodes[index]