Maya

api

exclusiveLightCheckBox with custom lights

Are you using the transform node and not the light's shape node? This is fairly important for it to work. Just for fun I had a go at doing it in python though; the power of that mel command is the fact that the light may be moved and reparented in the DAG and it will still work so I used the API to mimic that behaviour:

from maya import cmds
from maya import OpenMaya
 
class ExclusiveLightCheckBox(object):
    def __init__(self, inLight, inLabel=None, inWidth=200):
        self.light = inLight
        if not inLabel:
            self.label = inLight.fullPathName().rsplit('|')[-1]
        self.width = inWidth
 
    def getCheckBox(self):
        print self.light.fullPathName()
        if self.light.isValid():
            cb = cmds.checkBox( label=self.label, width=self.width, ofc=self.exclude, onc=self.include )
            #set default state
            if 'defaultLightSet' in cmds.listConnections('%s.instObjGroups[0]'%self.light.fullPathName(), s=False):
                cmds.checkBox(cb, e=True, v=True)
            return cb
 
    def exclude(self, e):
        if self.light.isValid():
            cmds.disconnectAttr('%s.instObjGroups[0]'%self.light.fullPathName(), 'defaultLightSet.dagSetMembers', na=True)
 
    def include(self, e):
        if self.light.isValid():
            cmds.connectAttr('%s.instObjGroups[0]'%self.light.fullPathName(), 'defaultLightSet.dagSetMembers', na=True)
 
#create a light, get it's transform and then get the MDagPath
#so that light1.fullName keeps working when the light gets reparented
light = cmds.spotLight(coneAngle=45)
light = cmds.listRelatives( light, p=True, f=True )[0]
 
list = OpenMaya.MSelectionList()
OpenMaya.MGlobal.getSelectionListByName(light, list)
 
lightPath = OpenMaya.MDagPath()
list.getDagPath(0, lightPath)
 
#create a window with the custom checkbox
w = cmds.window()
cmds.columnLayout()
ExclusiveLightCheckBox(lightPath).getCheckBox()
cmds.showWindow(w)