Multi parent constraint with expression

How to use:

• Select the object to contrain
• SHIFT+Select all the object that must constrain the first one
• Execute the script

On the target object there's a new attribute called "parentTo" and you can select from list. Now I'm trying to resolve the snap problem and create a simple pyQt interface...

This is the base script you can add to the Shelf

_________________________________________________

import maya.cmds as cmds

attrString = ''

selection = cmds.ls (sl=True)

target = selection[0]

l = len(selection)

for i in range(1,l):

    cmds.group(em=True, n = 'grp_' + selection[i])

    cmds.select('grp_' + selection[i],selection[i])

    cmds.parent()

    cmds.select('grp_' + selection[i],target)

    cmds.parentConstraint(mo=True, weight=1)

    cmds.select(cl=True)

    attrString += selection[i] + ':' 

    

cmds.select(target, r=True)

cmds.addAttr(ln='parentTo', at='enum', en = attrString, k=True, h = False)

expreString =''

for j in range (0,l-1):

    expreString += expreString + 'if (' + target + '.parentTo == '+ str(j) + '){'

    for i in range(1,l):

        if (i == (j+1)):

            expreString += target + '_parentConstraint1.' + 'grp_' + selection[i] + 'W' + str(i-1) + '= 1;'

        else:

            expreString += target + '_parentConstraint1.' + 'grp_' + selection[i] + 'W' + str(i-1) + '= 0;'

    expreString += '};'

    k += 1

    

cmds.expression(s = expreString)

_________________________________________________