mr vtx render

from pymel.core import *
sl = selected()

shader = ls("lambert2")

#make mental ray vertex
mrVtxCheck = ls("mrVtx_bake")
if not mrVtxCheck:
    mrVtx = shadingNode("mentalrayVertexColors",asTexture=1,n="mrVtx_bake")

for s in sl:

    print shader
    connectAttr(s.getShape()+".colorSet[0].colorName", mrVtx+".cpvSets[0]",f=1)
    #mrVtx.outColor >> shader[0].color