检查模型是否有点重合

思路：

        先求所有点的位置的列表，然后去掉重复的点的位置，再遍历出重复的点加入新的列表，最后选择这些重复的点。

下面有两种写法，第二种更完善，更快一点

①

import maya.cmds as mc

sel = mc.ls(sl=True)

vtx_num = mc.polyEvaluate(v=True)  

list_pos = []

for i in range(vtx_num):

      vtx_name = 'pSphere1.vtx[{0}]'.format(i)

      pos = mc.pointPosition(vtx_name)

      list_pos.append(pos)

list_pop = []

for a in list_pos:

      if list_pos.count(a) != 1:  

              if a in list_pop:

                    pass

              else:

                    list_pop.append(a)

list_sel = []

for b in range(vtx_num):

      for c in list_pop:

              vtx_name = 'pSphere1.vtx[{0}]'.format(b)

              if mc.pointPosition(vtx_name) == c:

                    list_sel.append(vtx_name)

mc.select(list_sel)   

②

import maya.cmds as mc

sel = mc.ls(sl=True)

for obj in sel:

    vtx_num = mc.polyEvaluate(obj,v=True)

    dict = {}

    allpos = []

    for all in range(vtx_num):

        trans = []

        vtx_name = 'pSphere1.vtx[{0}]'.format(all)

        vtx_pos = mc.pointPosition(vtx_name)

        for b in vtx_pos:

            trans.append(round(b,2))

        allpos.append(trans)

        dict[str(trans)] =  vtx_name

    list_sel = []

    check =[]

    for c in allpos:

        if c not in check:

            check.append(c)

        else:

            list_sel.append(dict.get(str(c)))

print allpos

mc.select(list_sel)