Error in extracting edge to curve from plane

[niuxihuanming]

Hi, this is a script for converting edges into curves from the U/V direction of a polygon plane. Now, after being converted into curves, the edge curves will bend, and the points of each curve do not match the vertices of the polygon edges. How should we solve this problem?

import maya.cmds as cmds

def xgtCurveTubeExtract():
    extractFrom = cmds.radioCollection('radioCol_source', query=True, sl=True)
    flipDirection = cmds.checkBox('flipDirection', query=True, value=True)
    hideTubes = cmds.checkBox('hideTubes', query=True, value=True)
    extractedList = []
    nurbShapeList = []
    selGeos = cmds.ls(selection=True)
    to_remove = []
    for i in selGeos:
        polyToSubD = cmds.polyToSubdiv(i, ap=0, ch=0, aut=0, maxPolyCount=30000, maxEdgesPerVert=32)
        subDtoNurb = cmds.subdToNurbs(polyToSubD, ch=0, aut=1, ot=0)
        nurbShapeList.append(cmds.listRelatives(subDtoNurb)[0])
        to_remove.append(polyToSubD)
        nurbsUDirList = []
        nurbsVDirList = []

    for i in nurbShapeList:
        if cmds.getAttr(i + '.fu') == 0:
            nurbsUDirList.append(i)
        else:
            nurbsVDirList.append(i)
        if flipDirection == False:
            if i in nurbsUDirList:
                dirValue = 'v'
            if i in nurbsVDirList:
                dirValue = 'u'
        elif i in nurbsUDirList:
            dirValue = 'u'
        else:
            if i in nurbsVDirList:
                dirValue = 'v'
  ########                              
        if extractFrom == 'geoTopo':
            if flipDirection == False:
                if i in nurbsVDirList:
                    geoSpan = cmds.getAttr(i + '.spansU')
                else:
                    geoSpan = cmds.getAttr(i + '.spansV')
                for span in range(geoSpan)[0::2]:
                    crvStr = i + '.' + dirValue + '[' + str(span) + ']'
                    extractedCrv = cmds.duplicateCurve(crvStr)
                    extractedList.append(extractedCrv[0])

            else:
                if i in nurbsVDirList:
                    geoSpan = cmds.getAttr(i + '.spansV')
                else:
                    geoSpan = cmds.getAttr(i + '.spansU')
                for span in range(geoSpan)[0::2]:
                    crvStr = i + '.' + dirValue + '[' + str(span) + ']'
                    extractedCrv = cmds.duplicateCurve(crvStr)
                    extractedList.append(extractedCrv[0])

    if hideTubes:
        cmds.hide(selGeos)
    for x in to_remove:
        cmds.select(x)
        cmds.delete(x)

    cmds.warning('Curves Extracted')
    cmds.select(extractedList)
####        
cmds.window( title='curve')
cmds.columnLayout()
##                

cmds.radioCollection('radioCol_source')
cmds.radioButton('geoTopo', label='Convert edges to curves')
cmds.checkBox('hideTubes', label='Hidden model', en=True)
cmds.checkBox('flipDirection', label='Flip direction', en=True) 
cmds.button(label='determine', c=(lambda *arg: xgtCurveTubeExtract()), w=100)

cmds.showWindow()