Thank you for your patience, but I really want to implement the following function: automatically create the material ball and sky objects to reduce the workload.But the standard material and node material have the same ID, which is difficult to implement in a normal way.Thank you again for your patient reply.

Here is the Arnold renderer script code:

import c4d

def main():
    #Select active objects.
    objects = doc.GetActiveObjects(c4d.GETACTIVEOBJECTFLAGS_CHILDREN)
    if not objects :
       raise ValueError("No objects selected.")

    doc.StartUndo()
    
    for obj in objects:
        
        #Collect texture tags.
        Tags = obj.GetTags()
        TextureTag = [TagList for TagList in Tags if TagList.GetRealType() == 5616]

        #Delet blank texture tag.
        if TextureTag != 0:
            for Blank in TextureTag:
                if Blank[c4d.TEXTURETAG_MATERIAL] == None:
                    doc.AddUndo(c4d.UNDOTYPE_CHANGE,Blank)
                    Blank.Remove()

        #Add an arnold texture ball and texture tag to each active object.
        arnold = c4d.BaseMaterial(1033991)
        Tag = c4d.BaseTag(5616)
        Tag[c4d.TEXTURETAG_MATERIAL] = arnold
        doc.InsertMaterial(arnold)
        obj.InsertTag(Tag)

    #Create the arnold sky object.
    Sky = c4d.BaseObject(1034624)
    doc.InsertObject(Sky)
    
    doc.EndUndo()
    c4d.EventAdd()

if __name__ == "__main__":
    main()

Thank you for your reply. I know that the third party renderer has opened the Python interface. Sorry to interrupt. Thanks again for your reply.The screenshot is as follows:

Thank you very much for your help to solve the previous doubts. I will continue to work hard.

Hi:
I am a beginner of Python, my English is not very good, please forgive me.I wrote a script that was broadly similar to the new "Axis Center" feature in R21, but had difficulty writing an interactive interface.The main problem is that the first time you click the "Null" button, you can normally create a Null object, but the second time the error is reported, what is going on? How do buttons run repeatedly ?

# -*- coding: UTF-8 -*-

 import c4d
from c4d import gui

__TITLE__ = "Axis Center"
null = []

 class MyDialog(gui.GeDialog):
def CreateLayout(self):
    self.SetTitle(__TITLE__ )
    self.GroupBegin(id=1000, flags=c4d.BFH_FIT, cols=2, title="Axes")
    self.GroupBorder(c4d.BORDER_GROUP_IN)
    self.GroupSpace(5, 5)
    self.GroupBorderSpace(10, 0, 10, 4)
    self.AddEditSlider(id = 1001, flags=c4d.BFH_RIGHT, initw=60, inith=15)
    self.AddEditSlider(id = 1002, flags=c4d.BFH_RIGHT, initw=60, inith=15)
    self.AddEditSlider(id = 1003, flags=c4d.BFH_RIGHT, initw=60, inith=15)
    self.AddCheckbox(id = 1004, flags=c4d.BFH_RIGHT, initw=80, inith=15, name="Null")
    self.GroupEnd()

    self.AddButton(1005, flags=c4d.BFH_LEFT, initw=180, inith=10, name="GO")
    return True

def Command(self,id,msg):
    if id == 1004:
        null.append(c4d.BaseObject(5140))
    else:
        pass

    if id == 1005:
        main()
    return True

def main():
present = doc.GetActiveObjects(c4d.GETACTIVEOBJECTFLAGS_CHILDREN)
if not present:
    print "The polygon object was not selected"
    gui.MessageDialog('The polygon object was not selected!')
    return

for obj in present:
    pl  = obj.GetAllPoints()
    pc  = len(pl)
    sel = obj.GetPointS()
    sel = sel.GetAll(pc)

indexe  = [i for i,o in enumerate(pl)]
position  = [o for i,o in enumerate(pl)]
il  = [i for i,o in enumerate(pl) if sel[i] == 1]
spl = [o for i,o in enumerate(pl) if sel[i] == 1]

if len(spl) < 1:
    print "no enough points"
    gui.MessageDialog('no enough points!')
    return False

x_record =  [round(a[0],7) for a in spl if round(a[0],7) != -0.0]
x_record += [0 for b in spl if round(b[0],7) == -0.0]

y_record =  [round(c[1],7) for c in spl if round(c[1],7) != -0.0]
y_record += [0 for d in spl if round(d[1],7) == -0.0]

z_record =  [round(e[2],7) for e in spl if round(e[2],7) != -0.0]
z_record += [0 for f in spl if round(f[2],7) == -0.0]

x_record.sort(reverse=True)
y_record.sort(reverse=True)
z_record.sort(reverse=True)

x = (round((x_record[0] - x_record[-1]) * dlg.GetFloat(1001) * 0.01 , 5)) + x_record[-1]
y = (round((y_record[0] - y_record[-1]) * dlg.GetFloat(1002) * 0.01 , 5)) + y_record[-1]
z = (round((z_record[0] - z_record[-1]) * dlg.GetFloat(1003) * 0.01 , 5)) + z_record[-1]

m = obj.GetMg()
mx   = obj.GetMg()
mx.off = mx.Mul(c4d.Vector(x,y,z))

matrix = []
for orientation in position:
    mt = c4d.Matrix()
    mt.off = orientation
    m_mt = m.__mul__(mt)
    swop = m_mt.__invert__()
    result = swop.__mul__(mx)
    matrix.append(result.__invert__())

doc.StartUndo()
doc.AddUndo(c4d.UNDOTYPE_CHANGE,obj)

obj.SetMg(mx)
if not null:
    pass

else:
    doc.InsertObject(null[0])
    null[0].SetMg(mx)

point_position = [(t.off) for t in matrix]
point_indexe   = [([indexe[z],point_position[z]]) for z in range(len(indexe))]
set_point      = [obj.SetPoint(k[0],k[1]) for k in point_indexe]

obj.Message(c4d.MSG_UPDATE)
c4d.EventAdd()
doc.EndUndo()

if __name__=='__main__':
__anchor__ = "\u98de\u821e\u7684\u56e2\u5b50"
dlg = MyDialog()
dlg.Open(c4d.DLG_TYPE_ASYNC, 450, 200, 300, 300)

Hi：
I'm a beginner in Python, and I've had a problem for a long time, because the material ID is the same, and some of the functionality doesn't work. When can the ID be updated?