https://www.psoft.co.jp/jp/support/faq/archive/pencil4-maya/#collapse8692

pencilPorySmoothRender_command.mel

//ランタイムコマンド上書き
/*
source "pencilPorySmoothRender_command.mel"
*/
global proc RenderIntoNewWindow()
{
    python("import pencilPorySmoothRender_command as pPSR_command;reload(pPSR_command)");
    python("pPSR_command.runtimePencilRender()");
}
/*
//元に戻すやつ
global proc RenderIntoNewWindow()
{
    renderIntoNewWindow render;
}
*/

pencilPorySmoothRender_command.py

# -*- coding: utf-8 -*-
#コーディング: utf-8
#------------------------------------------------------------------------------
import maya.cmds as cmds
import maya.mel
#------------------------------------------------------------------------------
"""
import pencilPorySmoothRender_command as pPSR_command;reload(pPSR_command)
#pPSR_command.createSets()#スムース用Setsの作成
#pPSR_command.addSets()#スムース用Setsにメッシュオブジェクトを追加
#pPSR_command.removeSets()#スムース用Setsからメッシュオブジェクトを除外
#pPSR_command.pencilRender()#スムース用Sets内のメッシュオブジェクトにpolySmoothFace dv=2 を適用してレンダリングして元に戻す。
"""
_PRSSets="pencilRenderSmoothSets"

def createSets():
    if not cmds.objExists(_PRSSets):
        cmds.sets(name=_PRSSets)


def addSets():
    _getMesh=[_item for _item in cmds.ls(sl=True) if cmds.listRelatives(_item,shapes=True,type="mesh")]
    createSets()
    cmds.sets(_getMesh,edit=True,forceElement=_PRSSets)


def removeSets():
    _getMesh=[_item for _item in cmds.ls(sl=True) if cmds.listRelatives(_item,shapes=True,type="mesh")]
    if cmds.objExists(_PRSSets):
        cmds.sets(_getMesh,edit=True,rm=_PRSSets)

def pencilSmooth(_object):
    _smooth=cmds.polySmooth(_object,dv=2)
    cmds.rename(_smooth,"pencilPorySmooth#")


def deletePPS(_meshList=[]):
    if not len(_meshList):
        _meshList=[_item for _item in cmds.ls(sl=True) if cmds.listRelatives(_item,shapes=True,type="mesh")]

    for _mesh in _meshList:
        for _pps in list(set(cmds.listConnections(cmds.listRelatives(_mesh,shapes=True),type="polySmoothFace")or [])):
            cmds.delete(_pps)
#deletePPS()


def resetSMP(_getList):
    _dict={}
    _meshList=[_item for _item in _getList if cmds.listRelatives(_item,shapes=True,type="mesh")]
    for _mesh in _meshList:
        _dict.update({_mesh:cmds.getAttr("%s.displaySmoothMesh" % _mesh)})

        cmds.setAttr("%s.displaySmoothMesh" % _mesh,0)

    return _dict

def setSMP(_dict):

    for _key,_value in _dict.items():
        cmds.setAttr("%s.displaySmoothMesh" % _key,_value)

def preRenderScript():
    pass


def postRenderScript():
    pass


def pencilRender():
    _pencilMsRender=False
    if cmds.objExists(_PRSSets) and cmds.getAttr("defaultRenderGlobals.currentRenderer") == "mayaSoftware":
       _pencilMsRender=True
    
    if _pencilMsRender:
        _getList=cmds.sets(_PRSSets,q=True)
        deletePPS(_getList)
        _dict=resetSMP(_getList)

        for _mesh in _getList:
            pencilSmooth(_mesh)

        preRenderScript()

    maya.mel.eval("renderIntoNewWindow render;")
    
    if _pencilMsRender:
        deletePPS(_getList)
        setSMP(_dict)

        postRenderScript()

#pencilRender()


#ランタイムコマンド用 & シーン内のメッシュ全部スムース
def runtimePencilRender():
    _pencilMsRender=False
    if cmds.getAttr("defaultRenderGlobals.currentRenderer") == "mayaSoftware":
       _pencilMsRender=True
    
    if _pencilMsRender:
        _getList=cmds.listRelatives(cmds.ls(type="mesh"),parent=True)
        deletePPS(_getList)
        _dict=resetSMP(_getList)

        for _mesh in _getList:
            pencilSmooth(_mesh)

        preRenderScript()

    maya.mel.eval("renderIntoNewWindow render;")
    
    if _pencilMsRender:
        deletePPS(_getList)
        setSMP(_dict)

        postRenderScript()