Maya Python:cmds.button(),UI传递变量并调用函数？

首先,这似乎是一个学习更多编程的好地方.我编写了一个maya python脚本,其中两个函数都有效,但我无法通过UI按钮来调用superExtrude()函数.第一个函数执行几何网格操作,第二个函数应该为用户输入生成UI:

import maya.cmds as cmds

def superExtrude(extrScale, extrDist):
    """Loops through a list of selected meshes and extrudes all of the mesh faces to produce a polygon frame, based on existing mesh tesselations"""
    myObjectLt = cmds.ls(selection=True)

    for i in range(len(myObjectLt)):
        numFaces = cmds.polyEvaluate(face=True)
        item = myObjectLt[i] + ".f[:]"
        cmds.select(clear=True)
        cmds.select(item, replace=True)

        #extrude by scale
        cmds.polyExtrudeFacet(constructionHistory=True, keepFacesTogether=False, localScaleX=extrScale, localScaleY=extrScale, localScaleZ=extrScale)
        selFaces = cmds.ls(selection=True)
        cmds.delete(selFaces)

        #extrude by height
        cmds.select(item, replace=True)
        cmds.polyExtrudeFacet(constructionHistory=True, keepFacesTogether=True, localTranslateZ=extrDist)

def extrWindow():
    """Creates the user interface UI for the user input of the extrusion scale and height"""
    windowID = "superExtrWindow"

    if cmds.window(windowID, exists=True):
        cmds.deleteUI(windowID)

    cmds.window(windowID, title="SuperExtrude", sizeable=False, resizeToFitChildren=True)
    cmds.rowColumnLayout(numberOfColumns=2, columnright",3])

    cmds.text(label="Extrusion Scale:")
    extrScaleVal = cmds.floatField(text=0.9)
    cmds.text(label="Extrusion Height:")
    extrDistVal = cmds.floatField(text=-0.3)
    cmds.separator(height=10, )
    cmds.separator(height=10, )
    cmds.separator(height=10, )

    cmds.button(label="Apply", command=superExtrude(extrScaleVal, extrDistVal))
    cmds.showWindow()

extrWindow()

我是python和maya脚本的新手,所以任何帮助都会非常感激.:)