Python command implementing MPxPolyTweakUVCommand

Coding
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#1

Hi!

I would like to create a simple command manipulating UV coords in Python Maya using the MPxPolyTweakUVCommand class exposed by API. What initially looked like a simply task to do, turned out to quite difficult for me :wink: This is my code:

from builtins import object
from builtins import range
import maya.OpenMaya as OpenMaya
import maya.OpenMayaMPx as OpenMayaMPx
import sys
import os


class TweakUvTest(OpenMayaMPx.MPxPolyTweakUVCommand):

    def __init__(self):
        OpenMayaMPx.MPxPolyTweakUVCommand.__init__(self)

    def isUndoable(self):
        print('isUndoable')
        return False
    
    def hasSyntax(self):
        print('hasSyntax')
        return False
    
    def newSyntax(self, *args, **kwargs):
        print('newSyntax')
    
    def parseSyntax(self, *args, **kwargs):
        print('parseSyntax')
    
    def getTweakedUVs(self, mesh, uvList, uPos, vPos):
        print('getTweakedUVs')


kPluginCmdName = "TweakUvTest"


def cmdCreator():
    return OpenMayaMPx.asMPxPtr(TweakUvTest())

def syntaxCreator():
    print('syntaxCreator')
    return OpenMaya.MSyntax()

def initializePlugin(mobject):
    mplugin = OpenMayaMPx.MFnPlugin(mobject, "Autodesk", "1.0", "Any")
    try:
        mplugin.registerCommand(kPluginCmdName, cmdCreator, syntaxCreator)
    except:
        sys.stderr.write("Failed to register command: %s\n" % kPluginCmdName)
        raise

def uninitializePlugin(mobject):
    mplugin = OpenMayaMPx.MFnPlugin(mobject)
    try:
        mplugin.deregisterCommand(kPluginCmdName)
    except:
        sys.stderr.write("Failed to unregister command: %s\n" % kPluginCmdName)
        raise

Unfortunately when I run the command, the getTweakedUVs method is not being called at all. The output I am getting is only:

# Error: RuntimeError: file <string> line 2: (kFailure): Unexpected Internal Failure

Any ideas what’s wrong?

#2

Hi,

You have to implement the method doIt in your class TweakUvTest. This method overrides the method from the class MPxCommand and it medatory for your command to run.

def doIt(self, argList):
    print("Hello World!")

This is the code the command will be running when you use the command:

import maya.cmds as cmds

cmds.TweakUvTest()

Cheers !