Mirror channel values across controllers

mirror_channels.py

"""
Given a node following the convention <side>_<name>_<suffix>, look for an
equivalent side with matching suffix and transfer attribute values across.

.. note:: This assumes controllers are mirrored by *behaviour*; i.e.
    Identical values produce mirrored results.

"""


def mirror_control(ctrl):
    """Given a control, look up its side and transfer values to other side"""
    opposites = {'L': 'R', 'R': 'L'}
    side, name = ctrl.split("_", 1)
    opposite_ctrl = "%s_%s" % (opposites[side], name)

    for channel in ('translate', 'rotate', 'scale'):
        for axis in 'XYZ':
            value = cmds.getAttr("{name}.{chan}{ax}".format(
                name=ctrl, chan=channel, ax=axis))
            cmds.setAttr("{name}.{chan}{ax}".format(
                name=opposite_ctrl, chan=channel, ax=axis), value)
    

def hierarchy(ctrl):
    """Get hierarchy of `ctrl` with matching suffix"""
    typ = cmds.nodeType(ctrl)
    name, suffix = ctrl.rsplit("_", 1)

    descendents = list()    
    for descendent in cmds.listRelatives(ctrl,
                                         allDescendents=True,
                                         type=typ):
        if not descendent.endswith(suffix):
            continue
        descendents.append(descendent)

    return [ctrl] + descendents


for node in cmds.ls(sl=1):
    for ctrl in hierarchy(node):
        mirror_control(ctrl)