duplicate selected components

duplicateComponents

import maya.api.OpenMaya as om2
import maya.cmds as mc
try:
	# get selected components
	sel = om2.MGlobal.getActiveSelectionList()
	for s in xrange( sel.length() ):
		dp, comp = sel.getComponent( s )
		
		# get parent transform node from selected polygons
		parentNode = om2.MFnDagNode(dp).parent(0)
		parentNodeDag = om2.MDagPath().getAPathTo(parentNode)
		
		# store inclusive matrix from transform node
		parentNodeMatrix = parentNodeDag.inclusiveMatrix()
			
		# get all faces indexes
		compFn = om2.MFnSingleIndexedComponent(comp)
		ids = compFn.getElements()
		
		# get all points from the original mesh
		originalPoints = om2.MFnMesh( dp ).getPoints()
		
		#get all vertives that included in selected olygons
		outVertConnects = [ x for p in ids for x in om2.MFnMesh( dp ).getPolygonVertices(p) ]
		
		outVertSorted = list( set( outVertConnects ) )
		
		# create new empty transform node
		mdag = om2.MDagModifier()
		transformNode = mdag.createNode('transform')
		
		# rename it to the name of the original transform node
		mdag.renameNode(transformNode, parentNodeDag.partialPathName()+'_dupliacated' )
		mdag.doIt()
		
		# move empty transform node with the stored MMatrix
		om2.MFnTransform(transformNode).setTransformation( om2.MTransformationMatrix( parentNodeMatrix ) )
		
		# generate sequental indices list
		listSequental = range(len(outVertSorted))
		
		# reassign vertices indexes that appearen in outVertSorted but including the length of outVertSorted, so even if original
		# vertex has maximum index 240, and overall count of selected polygon vertices is 160, this vertex should be remapped like
		# 240=>160 and that should be done without changing the original position in list  
		outVertConectsOrdered = [ x + ( listSequental[outVertSorted.index(x)] - outVertSorted[outVertSorted.index(x)] ) for x in outVertConnects]
		
		# number of vertices that included in each polygon
		outVertCounts = [ om2.MFnMesh( dp ).getPolygonVertices(p).__len__() for p in ids]
		
		# cteate empty UV values, the new mesh will be created without UVs
		vValues = [ 0.0 ] * len(ids)
		
		# create empty MFnMesh
		outFnMesh = om2.MFnMesh()
		
		# get filtered points from the original points list
		outPoints = [ originalPoints[k] for k in set(outVertConnects) ]
		
		# create the new mesh under the empty transform node
		shapeNode = outFnMesh.create( outPoints, outVertCounts, outVertConectsOrdered, vValues, vValues, transformNode)
		
		# rename created shape
		mShapeDag = om2.MDagModifier()
		mShapeDag.renameNode( shapeNode, parentNodeDag.partialPathName()+'Shape_dupliacated' )
		mShapeDag.doIt()
		
		# get all shaders IDs assigned to original mesh polygons
		shaders, indices = om2.MFnMesh( dp ).getConnectedShaders(0)
		
		# sort materials indexes
		sharedFaceIDs = [ indices[o] for o in ids ]
		
		# iterate through each shader
		newShapeIt = om2.MItMeshPolygon( shapeNode )
		for s in xrange( len( shaders ) ):
			# create new Set from current shader
			shaderSet = om2.MFnSet( shaders[s] )
			selComponent = om2.MSelectionList()
			# iterate through each polygon of the new mesh
			for k in xrange(newShapeIt.count()):
				newShapeIt.setIndex(k)
				if sharedFaceIDs[k] == s:
					# add filtered components to the empty MSelectionList
					selComponent.add( (om2.MDagPath().getAPathTo(shapeNode), newShapeIt.currentItem() ) )
			# assign MSelectionList of the components to the current shader Set
			shaderSet.addMembers( selComponent )
		om2.MGlobal.setSelectionMode( 0 )
		om2.MGlobal.setActiveSelectionList( om2.MSelectionList().add( om2.MDagPath().getAPathTo(transformNode) ), 0 )
except:
	mc.warning( 'Select mesh faces or vertices' )