Maya 中的 CreateRenderNode 并更新自定义 UI

Question

我是 Python 新手，所以这似乎微不足道。我到处搜索以找到问题的答案，但似乎找不到。

我有一个脚本，就像一个迷你 Hypeshade 窗口，它的主要功能是创建材质并一键加载用户选择的所有纹理文件。当用户想要将噪音或检查器连接到文件输入之一（如凹凸、正常等）时，我希望有一个选项。这是在 Maya 中通过调用“createRenderNode”窗口来完成的。

现在，我让它工作了，它连接到我想要的输入，但我也想在我的 UI 中的相应文本字段中获取这个文件的名称，因为当我的函数运行时它没有，它得到一个空字符串，因为它还没有连接任何东西。

这是我的代码（我已经尝试了很多次迭代）：

# Error: 'NoneType' object is not iterable
# Traceback (most recent call last):
#   File "<maya console>", line 1, in <module>
#   File "<maya console>", line 49, in brwa
# TypeError: 'NoneType' object is not iterable #


import maya.cmds as cmds
import pymel.core as pm

def UI():

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

    mainwindow = cmds.window("MatWindow", t="Dummy UI", bgc=(0.2,0.2,0.2), mnb = False, mxb = False) 
    cmds.columnLayout()
    cmds.rowColumnLayout(nr = 1)
    cmds.textFieldGrp('mtNameTxt', l = "Material Name")
    cmds.setParent ( '..' )
    cmds.columnLayout()
    cmds.button("createlamb", l = "Create Lambert", c = 'lamb()')
    cmds.setParent ( '..' )
    cmds.rowColumnLayout('albclm', nr = 1)   
    cmds.textFieldGrp('albtxt', l = "Albedo", pht = "Albedo Map")
    cmds.iconTextButton('conna', w = 25, h = 20, i = "navButtonUnconnected.png", c = 'brwa()')
    cmds.setParent( '..' )
    cmds.separator(h = 20)
    cmds.text("Insert a name first, then create the lambert, then try to load a texture")
    cmds.showWindow()
    cmds.window("MatWindow", e = 1, w=550, h=150, sizeable = 0)

UI()

#=========== Lambert ===========#    
def lamb():
    matName = cmds.textFieldGrp('mtNameTxt', q = True, text = True)
    if cmds.objExists(matName) :
        cmds.confirmDialog( t = "Error", m = "Material name already exists, please choose another name.", b = "OK") 
    else :
        lambert = cmds.shadingNode("lambert", asShader = True, n = matName)
        shading_group = cmds.sets(r = True, nss = True, em = True, n = '%s_SG' %matName)
        cmds.connectAttr('%s.outColor' %matName ,'%s.surfaceShader' %shading_group)


def brwa():

    matName = cmds.textFieldGrp('mtNameTxt', q = True, text = True)## this gets the material name from the UI
    brwsa = '%s.color' %matName
    pm.defaultNavigation(destination = brwsa, createNew = 1)
    pm.defaultNavigation(destination = brwsa, defaultTraversal = 1) ## this opens the createRenderNode window
    brwsafile = cmds.listConnections(brwsa) ## this gets the connected file

    for fileName in brwsafile:   

        def button_cmd(_):
            # _ is a dummy argument the button sends, but you can ignore it
            cmds.select(fileName)

        cmds.iconTextButton('conna', edit = 1, i = "navButtonConnected.png", c = button_cmd)
        cmds.textFieldGrp('albtxt', edit = 1, text = fileName)

Answer 1

正如所写，明显的问题是

cmds.iconTextButton('conna', edit = 1, i = "navButtonConnected.png", c = "cmds.select(fileName)")

由于您已将命令指定为字符串，因此不会将“fileName”传递给 select 命令——如果您不小心将名为 fileName 的变量留在全局范围内，这可能会间歇性地工作；但它不会得到循环变量。

由于here 中说明的原因，您基本上永远不想将命令作为字符串传递。相反，直接传递一个函数对象。如果您内联定义函数，您甚至可以在定义函数的位置获取相关变量，以简化传递信息（上面的链接更详细）。

所以，是这样的：

def brwa():

     matName = cmds.textFieldGrp('mtNameTxt', q = True, text = True)## this gets the material name from the UI
     brwsa = matName + ".diffuse_color"                     
     pm.defaultNavigation(destination=brwsa, defaultTraversal=1) ## this opens the createRenderNode window
     brwsafile = cmds.listConnections(brwsa) ## this gets the connected file

     for fileName in brwsafile:   

        def button_cmd(_):
            # _ is a dummy argument the button sends, but you can ignore it
            cmds.select(fileName)

        cmds.iconTextButton('conna', edit = 1, i = "navButtonConnected.png", c = button_cmd)
        cmds.textFieldGrp('albtxt', edit = 1, text = fileName)

您的 sn-p 不完整，因此我无法对其进行测试——但这是您提供的行中的基本问题。