Reset bind position to joint position

gistfile1.txt

# Public domain

from pymel import core as pm
import re

def resetJointOnCluster(joint, skinClusterPreMatrixPlug):
    inverseMatrix = joint.attr('worldInverseMatrix').get()
    curMatrix = skinClusterPreMatrixPlug.get()
    if curMatrix is not None:
        different = any(abs(a-b) > 0.00001 for a, b in zip(inverseMatrix, curMatrix))
        if not different:
            return False

    skinClusterPreMatrixPlug.set(inverseMatrix, type='matrix')
    return True

def resetSkinnedJoints():
    """Reset skin deformation for selected skinClusters."""
    selection = pm.ls(sl=True) or []
    if not selection:
        print 'Select one or more skinClusters or joints.'
        return
        
    skinClustersToReset = []
    jointsReset = []
    for node in selection:
        if isinstance(node, pm.nodetypes.Joint):
            # If a joint is selected, reset the joint on all skinClusters that it's attached to.
            skinClustersOnJoint = pm.listConnections(node.attr('worldMatrix'), type='skinCluster', p=True) or []
            for skinClusterMatrixConnection in skinClustersOnJoint:
                skinCluster = skinClusterMatrixConnection.node()
                idx = skinClusterMatrixConnection.index()

                if resetJointOnCluster(node, skinCluster.attr('bindPreMatrix').elementByLogicalIndex(idx)):
                    jointsReset.append(node)
                    skinClustersToReset.append(skinCluster)
            continue

        if isinstance(node, pm.nodetypes.SkinCluster):
            # Reset all joints attached to this skinCluster.
            print 'Resetting joints on skinCluster %s' % node
            for idx in node.attr('matrix').get(mi=True):
                joints = pm.listConnections(node.attr('matrix').elementByLogicalIndex(idx), type='joint')
                if not joints:
                    print 'No joints attached to %s' % node
                    continue
    
                joint = joints[0]
                if resetJointOnCluster(joint, node.attr('bindPreMatrix').elementByLogicalIndex(idx)):
                    jointsReset.append(joint)
                skinClustersToReset.append(node)
        else:
            print 'Selected node %s isn\'t a skinCluster or a joint' % (node)
            continue

    print 'Reset %i joints: %s' % (len(jointsReset), ', '.join(node.nodeName() for node in jointsReset))

resetSkinnedJoints()