Convert between creased and hard edges

crease_hard_edges_conv.py

''' [Crease To Normal]
Created on 23.07.2012
edgeCreaser - uses edge Crease info to make it hard edge, or use Hard edge info to make edge crease.
@author: Serge Scherbakov
'''
import maya.cmds as cmds

class edgeCreaser():
    @staticmethod
    def apply(mode = 'c2n'):
        hardList = []
        softList = []
        selection = cmds.ls(sl = True)
        el = cmds.polyListComponentConversion(toEdge = True)
        cmds.select (el, r = True)
        edgeList = cmds.ls( sl = True, fl = True)
        if mode == 'c2n':
            for edge in edgeList:
                if cmds.polyCrease(edge, q = True, value = True)[0] > 0.0:
                    hardList.append(edge)
                else:
                    softList.append(edge)
            cmds.select(selection, r = True)
            vertsList = cmds.polyListComponentConversion(toVertex = True)
            cmds.select(vertsList , r = True)
            cmds.polyNormalPerVertex(ufn = True)
            if hardList:
                cmds.polySoftEdge(hardList, a = 0)
            if softList:
                cmds.polySoftEdge(softList, a = 180)
        if mode == 'n2c':
            for edge in edgeList:
                eInfo = cmds.polyInfo(edge, ev = True)
                if 'Hard' in eInfo[0]:
                    hardList.append(edge)
                else:
                    softList.append(edge)
            if softList:
                cmds.polyCrease(softList, operation = 1)
            if hardList:
                cmds.polyCrease(hardList, value = 10)
        cmds.select(selection, r = True)
        
edgeCreaser.apply('c2n')