撤消Maya API中的操作

import maya.api.OpenMaya as om
import maya.api.OpenMayaMPx as ompx

# 定义命令类
class CreateSphereCommand(ompx.MPxCommand):
    kPluginCmdName = "createSphere"

    def __init__(self):
        ompx.MPxCommand.__init__(self)
        self.sphereDagPath = None

    def doIt(self, args):
        self.redoIt()

    def redoIt(self):
        # 创建球体
        sphereTransform = om.MFnTransform()
        sphereTransform.create()
        sphereFn = om.MFnMesh()
        sphereFn.create(1, 1, om.MPointArray([om.MPoint(0, 0, 0)]), om.MIntArray([0]), om.MIntArray([0]), sphereTransform.object())
        self.sphereDagPath = om.MDagPath.getAPathTo(sphereTransform.object())
        om.MGlobal.displayInfo("Sphere created")

    def undoIt(self):
        # 删除球体
        if self.sphereDagPath:
            om.MGlobal.deleteNode(self.sphereDagPath.node())
            om.MGlobal.displayInfo("Sphere deleted")

    def isUndoable(self):
        return True

# 创建命令的工厂函数
def cmdCreator():
    return CreateSphereCommand()

# 初始化插件
def initializePlugin(mobject):
    mplugin = ompx.MFnPlugin(mobject)
    try:
        mplugin.registerCommand(CreateSphereCommand.kPluginCmdName, cmdCreator)
    except:
        om.MGlobal.displayError("Failed to register command: %s" % CreateSphereCommand.kPluginCmdName)

# 卸载插件
def uninitializePlugin(mobject):
    mplugin = ompx.MFnPlugin(mobject)
    try:
        mplugin.deregisterCommand(CreateSphereCommand.kPluginCmdName)
    except:
        om.MGlobal.displayError("Failed to deregister command: %s" % CreateSphereCommand.kPluginCmdName)

import maya.cmds as cmds
import maya.mel as mel

# 加载插件
cmds.loadPlugin("path/to/create_sphere_cmd.py")

# 执行命令
cmds.createSphere()

# 撤消命令
cmds.undo()

# 重做命令
cmds.redo()

# 卸载插件
cmds.unloadPlugin("create_sphere_cmd")