How can you get a vertex's attribute through Open Maya-CodePudding

I want an Open Maya getter and setter for locking a vertex's pnt attribute.

I am currently using Maya's standard cmds, but it is too slow.

This is my getter:

mesh = cmds.ls(sl=1)[0]
vertices = cmds.ls(cmds.polyListComponentConversion(mesh, toVertex=True), flatten=True)  

cmds.getAttr("{}.pntx".format(vertices[0]), lock=True)

This is my setter:

mesh = cmds.ls(sl=1)[0]
vertices = cmds.ls(mc.polyListComponentConversion(mesh, toVertex=True), flatten=True)

cmds.setAttr("{}.pntx".format(vertices[0]), lock=False)

This is what I have so far, in Open Maya:

import maya.api.OpenMaya as om

sel = om.MSelectionList()
sel.add(meshes[0])
dag = sel.getDagPath(0)
fn_mesh = om.MFnMesh(dag)

I think I need to pass the vertex object into an om.MPlug() so that I can compare the pntx attribute against the MPlug's isLocked function, but I'm not sure how to achieve this.

I have a suspicion that I need to get it through the om.MFnMesh(), as getting the MFnMesh vertices only returns ints, not MObjects or anything that can plug into an MPlug.

CodePudding user response：

My suspicion was correct; I did need to go through the MFnMesh. It contained an MPlug array for pnts. From there I was able to access the data I needed.

import maya.api.OpenMaya as om

meshes = mc.ls(type="mesh", long=True)
bad_mesh = []

for mesh in meshes:
    selection = om.MSelectionList()
    selection.add(mesh)
    dag_path = selection.getDagPath(0)
    fn_mesh = om.MFnMesh(dag_path)

    plug = fn_mesh.findPlug("pnts", True)

    for child_num in range(plug.numElements()):
        child_plug = plug.elementByLogicalIndex(child_num)

        for attr_num in range(child_plug.numChildren()):
            if child_plug.child(attr_num).isLocked:
                bad_mesh.append(mesh)
                break