Hello,

it seems that you are using the "op" variable in line 6 of your code. In the code you provided "basenodeobjectoutput" is not defined.

You are creating a Object Node without defining what object this node should reference. You can define the referenced object by setting the GV_OBJECT_OBJECT_ID parameter. Something like this:

  
objectNode.SetParameter(c4d.GV_OBJECT_OBJECT_ID, linkedObject, c4d.DESCFLAGS_SET_0)  

best wishes,
Sebastian

Hello,

I'm using this code in Python Generator.

import c4d  
  
def main() :  
  nul = c4d.BaseObject(5140)                                      # create a null  
  clr = c4d.BaseObject(1018544)                                   # create a cloner  
  link = op[c4d.ID_USERDATA,2]                                    # object  
  num = 5                                                         # number  
  userdata = c4d.GetCustomDatatypeDefault(c4d.DTYPE_BASELISTLINK) # user data type  
  userdata[c4d.DESC_NAME] = "Object Data"                         # user data name  
  clr.InsertUnder(nul)                                            # insert cloner under the null  
  clr[c4d.ID_MG_MOTIONGENERATOR_MODE] = 0                         # set cloner to object mode  
  clr[c4d.MG_OBJECT_LINK] = link                                  # link object to cloner  
   
  ###     
   
  # create user data field  
  linkobject = clr.AddUserData(userdata)  
  clr[linkobject] = clr  
  
  # xpresso stuff  
  xpressotag = c4d.BaseTag(c4d.Texpresso)  
  clr.InsertTag(xpressotag)  
  nodemaster = xpressotag.GetNodeMaster()  
    
  # create nodes  
  basenode = nodemaster.CreateNode(nodemaster.GetRoot(), c4d.ID_OPERATOR_OBJECT, None, 100, 100)  
  datanode = nodemaster.CreateNode(nodemaster.GetRoot(), 1019010, None, 0, 0)  
    
  # create ports  
  basenode.AddPort(c4d.GV_PORT_OUTPUT, c4d.DescID\  
  (c4d.DescLevel(c4d.ID_USERDATA, c4d.DTYPE_SUBCONTAINER, 0), c4d.DescLevel(1)), message = True)  
    
  # create connections  
  basenodeobjectoutput = basenode.GetOutPort(0)  
    
  datanodeinput = datanode.GetInPort(0)  
  datanodeoutput = datanode.GetOutPort(0)  
    
  basenodeobjectoutput.Connect(datanodeinput)                     # << error >>  
  
  ####  
  
  for i in xrange(num) :  
      obj = c4d.BaseObject(5159)                                  # base spline text  
      obj.InsertUnderLast(clr)                                    # insert clone under the cloner  
  
  # return final object  
  return nul  

If I don't insert cloner under the null object I don't get user data tab to the cloner.

Hello,

what code do you use in your Python Generator?

Best wishes,
Sebastian

Hi,

I know that. I'm not using op variable in Python Generator.

Hello,

in a Script Manager script "op" refers to the currently selected object. In a Python Generator it refers to the Generator Object. Maybe this is the difference.

Best wishes,
Sebastian

Hi,

I'm having now weird problems. Adding object port with DescID is not working. I'm using command:

basenode.AddPort(c4d.GV_PORT_OUTPUT, c4d.DescID(c4d.DescLevel(c4d.ID_USERDATA, c4d.DTYPE_SUBCONTAINER, 0), c4d.DescLevel(1)), message = True)

I "emulated" the problem with manually made objects and script manager.

Null
-->Cloner

This code works perfectly:

import c4d  
  
def main() :  
  #doc = c4d.documents.GetActiveDocument()  
  #pointobject = doc.GetActiveObject()  
     
  userdata = c4d.GetCustomDatatypeDefault(c4d.DTYPE_BASELISTLINK)  
  userdata[c4d.DESC_NAME] = "Object Data"  
  
  child = op.GetDown()  
    
  linkobject = child.AddUserData(userdata)  
  child[linkobject] = child  
  
  xpressotag = c4d.BaseTag(c4d.Texpresso)  
  xpressotag.SetName("PointLock XPresso")  
    
  child.InsertTag(xpressotag)  
    
  nodemaster = xpressotag.GetNodeMaster()  
  basenode = nodemaster.CreateNode(nodemaster.GetRoot(), c4d.ID_OPERATOR_OBJECT, None, 100, 100)  
    
  basenodeobjectoutput = basenode.AddPort(c4d.GV_PORT_OUTPUT, c4d.DescID(c4d.DescLevel(c4d.ID_USERDATA, c4d.DTYPE_SUBCONTAINER, 0),\  
c4d.DescLevel(1)), message = True)  
    
  #basenodepositionoutput = basenode.AddPort(c4d.GV_PORT_OUTPUT, c4d.ID_BASEOBJECT_REL_POSITION)  
  #c4d.modules.graphview.RedrawMaster(nodemaster)  
  
    
  c4d.EventAdd()  
  
if __name__=='__main__':  
  main()

But when I try to run same kind of code with python generator it is not making the object port. I also first need to insert cloner under null object and return the null to get user data field to cloner. If I try to return only the cloner it comes without user data. Is it the bug or do I need to play with DescID?

Thank you so much!

Now everything makes sense. Now I'm gonna work with this my thing and I will share the final product when and if I get it done.

Hello,

the problem is that the ports could not be found. Access the ports by the index:

  
portA = mathNode.GetInPort(0)  
portB = formulaNode.GetOutPort(0)  
  
portA.Connect(portB)  

best wishes,
Sebastian

Hi and thanks,

So there is way to go around that object port bug with user data field. Very nice!

I'm also able to add other kind of ports to nodes, but when I try to connect two ports together, no matter what nodes type is, I get error message: **AttributeError: 'NoneTpye' object has no attribute 'Connect'.
**
Sample code

formulaNode = nm.CreateNode(nm.GetRoot(), 400001133, None, 0, 0)  
mathNode = nm.CreateNode(nm.GetRoot(), 400001121, None, 0, 0)  
    
portA = mathNode.GetPort(c4d.GV_MATH_INPUT)  
portB = formulaNode.GetPort(c4d.GV_FORMULA_OUTPUT)  
        
portA.Connect(portB)

Hello,

currently there is a bug with creating object ports. See "OBJECT_OPERATOR_OBJECT_OUT".

best wishes,
Sebastian

Nice! Thank you.

I'm able to get node's ID with this script. I leave it here so it might be helpful for those who are struggling with same problem.

(Run in Script Manager)

import c4d  
  
# make xpresso tag and node manually  
# select xpresso tag and run the script  
  
def main() :  
  selection = doc.GetSelection()  
    
  for x in selection:  
        
      nm = x.GetNodeMaster()  
      root = nm.GetRoot()  
    
      firstNode = root.GetDown()          
      firstNodeID = firstNode.GetOperatorID()  
        
      print firstNodeID  
    
  c4d.EventAdd()  
  
if __name__=='__main__':  
  main()  

I'm almost there. Messing with ports are now giving me a headache.

nm = x.GetNodeMaster()  
root = nm.GetRoot()  
  
objectNode = nm.CreateNode(nm.GetRoot(), 400001000, None, 0, 0)  
objectIndexNode = nm.CreateNode(nm.GetRoot(), 400001152, None, 0, 0)  
  
# Check it is OK to add port?  
print objectNode.AddPortIsOK(c4d.GV_PORT_INPUT, c4d.GV_OBJECT_OPERATOR_OBJECT_IN)  
 **# prints True - everything should be fine**  
  
# Try to add port  
objectNode.AddPort(c4d.GV_PORT_INPUT, c4d.GV_OBJECT_OPERATOR_OBJECT_IN)  
 **# Nothing happens - port does not appear**  
  
# Try to connect two ports  
portA_IN = objectNode.GetInPort(0)  
portB_OUT = objectIndexNode.GetOutPort(0)         
portA_IN.Connect(portB_OUT)  
 **# AttributeError: 'NoneType' object has no attribute 'Connect'** 

I'm not sure what is wrong.

Hello,

like most classes of the API, GvNode ist based on BaseList2D and GeListNode. This means you can get the child objects of the root node with GeListNode.GetDown(). Then you can loop through the nodes using GeListNode. GetNext().

As long as your questions are related to the topic of creating Xpresso nodes you can continue in this threads. For other questions please open a new thread.

Best wishes,
Sebastian

Thanks again Sebastian,

I feel really stupid to ask this, but how can I call manually made xpresso node when I don't know its ID? There is no any command like GetFirstNode(). As far I can get is to call the main XGroup with this code:

nm = x.GetNodeMaster()  
root = nm.GetRoot()  
owner = nm.GetOwner()  
print root

I'm sorry that I keep asking different questions in this same topic. Should I make everytime new topic for every question?

Hello,

the Mograph Xpresso Nodes are no core nodes so they are not documented. You can get the ID of a given node by creating it manually and getting its ID with GetOperatorID(). In the case of the Data node the ID is 1019010.

The IDs or symbols of the ports can be found in the corresponding header file or in the C++ documentation.

Best wishes,
Sebastian

Hi and thank you very much!

Now I can create a xpresso tag to cloner object inside python generator, but where can i find xpresso nodes port ids so I can add them to the node? Can you only use nodes which are in this list (Graph View Node Types[URL-REMOVED])? I can't find any Motion Graphics nodes.

# create a xpresso tag  
tag = c4d.BaseTag(c4d.Texpresso)  
  
# insert xpresso tag to cloner  
clr.InsertTag(tag)  
  
nodeMaster = tag.GetNodeMaster()  
  
# create xpresso node (New Node > Motion Graphics > Data)  
modataNode = nodeMaster.CreateNode(nodeMaster.GetRoot(),c4d.ID_OPERATOR_MOGRAPH_DATA?, None, 0, 0)  
  
# add position port  
modataNode.AddPort(c4d.GV_PORT_OUTPUT, c4d.ID_POSITION? ,c4d.GV_PORT_FLAG_IS_VISIBLE,True)  

Edit:
Looks like it is not possible to do it this way. When I convert python generator (with c key) and open xpresso Cinema 4D will crash.

[URL-REMOVED] @maxon: This section contained a non-resolving link which has been removed.

Hello and welcome,

please post only one question per thread. This keeps the forum organized and makes it more easy to find existing answers.

Please notice that you should use a Python Generator only to create new, virtual objects. A Generator should not manipulate existing objects.

If you want to create a Xpresso tag you can do this using MakeTag() and the ID of the tag, which is Texpresso. From this Xpresso tag you can get the node master with GetNodeMaster(). Using that node master you can create new nodes. You will find some example code in the forum like here:

• User Data, Xpresso, Python

You can add user data to an object using AddUserData(). You find some example here:

• Creating structured User Data

But please remember that a Python Generator typically should not edit existing objects. In what context do you want to use GeGetMoData() in your generator?

If you need more information on a specific topic please open a new thread. Thanks.

Best wishes,
Sebastian