シーングラフを照会する http://help.autodesk.com/view/MAYAUL/2016/JPN//?guid=__files_GUID_0B85C721_C3C6_47D7_9D85_4F27B787ABB6_htm

printPaths.py

# -*- coding: utf-8 -*-
import sys
import maya.OpenMayaMPx as omMPx
import maya.OpenMaya as om


kPluginCmdName = 'printPaths'


class printPathsCmd(omMPx.MPxCommand):
    def __init__(self):
        omMPx.MPxCommand.__init__(self)

    def doIt(self, *args, **kwargs):
        selections = om.MSelectionList()
        om.MGlobal.getActiveSelectionList(selections)

        iterator = om.MItSelectionList(selections, om.MFn.kDagNode)

        if iterator.isDone():
            self.printScene()
        else:
            self.printSelectedDAGPaths(iterator)

    def printSelectedDAGPaths(self, pSelectionListIterator):

        dagPath = om.MDagPath()
        dagFn = om.MFnDagNode()

        print '=======================\n SELECTED DAG OBJECTS: \n======================='

        while not pSelectionListIterator.isDone():

            pSelectionListIterator.getDagPath(dagPath)
            try:
                dagPath.extendToShape()
            except Exception as e:
                pass

            dagObject = dagPath.node()
            dagFn.setObject(dagObject)
            name = dagFn.name()
            apiTypeName = dagObject.apiTypeStr()

            fntypes = []
            om.MGlobal.getFunctionSetList(dagObject, fntypes)

            print '%s (%s)' % (name, apiTypeName)
            print '\tDAG path: [%s]' % (dagPath.fullPathName())
            print '\tCompatible function sets: %s' % fntypes

            pSelectionListIterator.next()

        print '======================='

    def printScene(self):

        dagNodeFn = om.MFnDagNode()
        dagIterator = om.MItDag( om.MItDag.kDepthFirst,
                                 om.MFn.kInvalid)

        print '=======================\n SCENE GRAPH (DAG):    \n======================='

        while not dagIterator.isDone():

            dagObject = dagIterator.currentItem()
            depth = dagIterator.depth()

            dagNodeFn.setObject(dagObject)
            name = dagNodeFn.name()
            apiTypeName = dagObject.apiTypeStr()

            output = ['\t' for i in range(0, depth)]
            output.append('%s (%s)' % (name, apiTypeName))

            print ''.join(output)

            dagIterator.next()

        print '======================='


def cmdCreator():
    return omMPx.asMPxPtr(printPathsCmd())


def initializePlugin(mobject):
    mplugin = omMPx.MFnPlugin(mobject)
    try:
        mplugin.registerCommand(kPluginCmdName, cmdCreator)
    except:
        sys.stderr.write(u'Failed to register command: %s\n' % kPluginCmdName)


def uninitializePlugin(mobject):
    mplugin = omMPx.MFnPlugin(mobject)
    try:
        mplugin.deregisterCommand(kPluginCmdName)
    except:
        sys.stderr.write(u'Failed to unregister command: %s\n' % kPluginCmdName)