Reverse subdivision

reverse_subd.py

from pymel.all import *
import maya.mel as mel
import maya.OpenMaya as om


'''
def makeUnique( lst ):
	result = list()
	map( lambda x: not x in result and result.append(x), lst )
	return result
	
print makeUnique( edges )	
'''

#Get the selected mesh
slm = ls( sl=1 )[0]

sel = slm.getShape().vtx[0]
asel = ls( polyListComponentConversion( polyListComponentConversion( sel, tf=1 ), tv=1 ), fl=1 )
sel = [ v for v in asel if not v.isConnectedTo( sel ) and v != sel ]

#Convert selection to edges...
es = [ e.indices()[0] for e in ls( polyListComponentConversion( sel[0], fv=1, te=1 ), fl=1 ) ]
edges = []

#Select edge loops and rings...
for e in es:
	edges.extend( polySelect( slm, el=e, ns=1 ) )
edges = list( set( edges ) )

es = []
for e in edges:
	es.extend( polySelect( slm, er=e, en=2, ns=1 ) )
edges = list( set( es ) )

#sorted( edges, key=int ) 


elementArray = om.MIntArray ()
msu = om.MScriptUtil()
msu.createIntArrayFromList( edges, elementArray )

sel = om.MSelectionList()
components = om.MObject()

edges = om.MFnSingleIndexedComponent()
components = edges.create( api.MFn.kMeshEdgeComponent )
edges.addElements( elementArray )

def mDagPathFromName( name ):
	selList = om.MSelectionList()
	selList.add( str( name ) )
	mDagPath = om.MDagPath()
	selList.getDagPath( 0, mDagPath )
	return mDagPath
	

mdag = mDagPathFromName( slm )

sel.add( mdag, components )
om.MGlobal.setActiveSelectionList( sel, om.MGlobal.kReplaceList  )