List the members of a shading group.

[johan Borgström]

Hi,

I am using the following snippet (pymel) to list the objects that are connected to the selected material. What would be the cmds version of doing the same? (listing both meshes and mesh faces)

import pymel.core as pm

# list the materials

mat_list = pm.ls(mat=True, sl=True)

for mat in mat_list:

    

    # list the shading groups

    sg_list = mat.listConnections(type='shadingEngine')

    

    for sg in sg_list:

        

        # get the members of the sg

        member_list = sg.members()

        

        for member in member_list:

            

            print(member)

Cheers,

Johan

[Justin Israel]

mat_list = cmds.ls(mat=True, sl=True)
for mat in mat_list:
    sg_list = cmds.listConnections(type='shadingEngine')

    for sg in sg_list:
        member_list = cmds.sets(sg, q=True)
        if not member_list:
            continue

        for member in member_list:
            print member

​

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[johan Borgström]

Thanks Justin,

I would like to filter the members based on the type. So for instance separate meshes from meshFaces. The if statement below evaluates to true for both meshes and faces. I guess a face is a "subclass" of mesh. How could I separate the two?

if cmds.objectType(member, isType='mesh'):

                print('mesh and face')

Cheers,

Johan

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[Justin Israel]

There are probably a bunch of ways to do this, but here is one that might work:

mat_list = cmds.ls(mat=True, sl=True)
for mat in

 mat_list:
    sg_list = cmds.listConnections(mat, type='shadingEngine')
    if not sg_list:
        continue

    for sg in sg_list:
        if not cmds.sets(sg, q=True, size=True):
            continue

        print "[set]", sg
        cmds.select(sg, replace=True)

        members = cmds.ls(sl=True, exactType="mesh") or []
        for member in members:
            print "[mesh]", member

        members = cmds.filterExpand(sm=34, expand=False) or []
        for member in members:
            print "[shape]", member

​

ls() can filter on inherited or exact node types, and filterExpand can filter the existing selection for faces

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[johan Borgström]

Great, thank you!

Cheers,

Johan

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[Roy Nieterau]

Just to add on top of Justin's version. You don't need to perform the actual selection, both ls() and filterExpand() can operate on input objects. Like so:

mat_list = cmds.ls(mat=True, sl=True)

for mat in mat_list:
    sg_list = cmds.listConnections(mat, type='shadingEngine')
    if not sg_list:
        continue

    for sg in sg_list:

        members = cmds.sets(sg, q=True)

        meshes = cmds.ls(members, exactType="mesh")
        for mesh in meshes:
            print "[mesh]", mesh

        faces = cmds.filterExpand(members, sm=34, expand=False) or []
        for face in faces:
            print "[face]", faces

Of course this would be a micro-optimization I assume. :)

-Roy

[Justin Israel]

Naw I would give it much more credit than a "micro-optimization". It is definitely better to leave the selection list as it is, if you can help it, in addition to getting a bump for not having to change it :-)

Thanks!

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[johan Borgström]

Thanks Roy!

I agree with Justin, great tip :)

On Tuesday, August 26, 2014 11:01:13 AM UTC+2, Justin Israel wrote:

Naw I would give it much more credit than a "micro-optimization". It is definitely better to leave the selection list as it is, if you can help it, in addition to getting a bump for not having to change it :-)

Thanks!

On Tue, Aug 26, 2014 at 7:50 PM, Roy Nieterau <royni...@gmail.com> wrote:

Just to add on top of Justin's version. You don't need to perform the actual selection, both ls() and filterExpand() can operate on input objects. Like so:

mat_list = cmds.ls(mat=True, sl=True)

for mat in mat_list:
    sg_list = cmds.listConnections(mat, type='shadingEngine')
    if not sg_list:
        continue

    for sg in sg_list:

        members = cmds.sets(sg, q=True)

        meshes = cmds.ls(members, exactType="mesh")
        for mesh in meshes:
            print "[mesh]", mesh

        faces = cmds.filterExpand(members, sm=34, expand=False) or []
        for face in faces:
            print "[face]", faces

Of course this would be a micro-optimization I assume. :)

-Roy

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