Nicest way of fetching om.MFnMesh object from cmds.ls?

[Fredrik Averpil]

I have this:

import maya.api.OpenMaya as om
import maya.cmds as cmds

for mesh in cmds.ls(type='mesh'):
    selectionList = om.MSelectionList()
    selectionList.add(mesh)
    dagPath = selectionList.getDagPath(0)
    fnMesh = om.MFnMesh(dagPath)  # got it!

Is this the simplest/nicest way to iterate over all meshes and get the MFnMesh object or how would you improve this?

I’m asking primarily for readability purposes.

Regards,
Fredrik

​

[vincent zaraek]

Hi Fredrik ,if you are working on maya 2017 you could use iterators, it should be faster/simplest

it = om.MItDag(om.MItDag.kDepthFirst,om.MFn.kMesh)

while not it.isDone():

fnMesh = om.MFnMesh(it.item())

        #do your stuff

it.next()

As far as I know, the python api 2.0 it hasn't iterators until maya 2017, or you could use standart maya api:

from maya import OpenMaya as om

[Fredrik Averpil]

Hi Vincent,

Thanks for that, although I'm looking for something which will also work in Maya 2015/2016. I might just stick with what I have. I guess I just feel it's a bit odd that I need to create a list of objects (with one object) from which I can extract the DAG path ... instead of just using the DAG path directly from the "cmds.ls(type='mesh', )" command.

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[Cesar Saez]

It's a trade off, but you can always hide those details in a utility module or something.

# utils.py
import maya.api.OpenMaya as om2


def asSelectionList(iterable):
    selectionList = om2.MSelectionList()
    for each in iterable:
        selectionList.add(each)
    return selectionList


def asDagPaths(iterable):
    selectionList = asSelectionList(iterable)
    for i in xrange(selectionList.length()):
        yield selectionList.getDagPath(i)


# foo.py -- usage code
import maya.api.OpenMaya as om2
import maya.cmds as cmds
import utils  # utility module

for meshPath in utils.asDagPaths(cmds.ls(type='mesh')):
    fnMesh = om2.MFnMesh(meshPath)  # got it!