In 2024.3.1 python cannot set the layer parameter of a Capsule object. Other object types seem to be unaffected. Console shows the error: “AttributeError: parameter set failed”

Reproduction:

• Open Cinema 4D
• Add new layer in the Layer Manager
• Add a capsule object to the scene (e.g. Polygon Bevel)
• Run the script below in the Script Manager to set layer parameter for all objects

import c4d

def main() -> None:
    
    # Get first layer
    myLayer = doc.GetLayerObjectRoot().GetDown()
    
    # Get objects in scene
    allObjects = doc.GetObjects()
    
    # Set layer attribute for objects in scene
    for i in range(len(allObjects)):
        allObjects[i][c4d.ID_LAYER_LINK] = myLayer
        c4d.EventAdd()
    
if __name__ == '__main__':
    main()

Result

• The capsule layer is NOT set
• Error appears in console in the python tab

Versions

• [NOK] 2024.3.1
• [OK] 2024.2.0

Tested on:

• Windows 11 Pro (23H2)
• OSX Monterey 12.6.3

In 2024.3.1 python cannot set the layer parameter of a Capsule object. Other object types seem to be unaffected. Console shows the error: “AttributeError: parameter set failed”

Reproduction:

• Open Cinema 4D
• Add new layer in the Layer Manager
• Add a capsule object to the scene (e.g. Polygon Bevel)
• Run the script below in the Script Manager to set layer parameter for all objects

import c4d

def main() -> None:
    
    # Get first layer
    myLayer = doc.GetLayerObjectRoot().GetDown()
    
    # Get objects in scene
    allObjects = doc.GetObjects()
    
    # Set layer attribute for objects in scene
    for i in range(len(allObjects)):
        allObjects[i][c4d.ID_LAYER_LINK] = myLayer
        c4d.EventAdd()
    
if __name__ == '__main__':
    main()

Result

• The capsule layer is NOT set
• Error appears in console in the python tab

Versions

• [NOK] 2024.3.1
• [OK] 2024.2.0

Tested on:

• Windows 11 Pro (23H2)
• OSX Monterey 12.6.3

Hi @ferdinand , thank you for kindly informing me, and for your guidance.

I was able to achieve a working solution by simplifying. This Script Manager script:

1. creates a cube
2. creates a take
3. creates an override with new width for the cube

import c4d

def main() -> None:

    # Instantiate a cube – for test only
    obj = c4d.BaseObject(c4d.Ocube)
    doc.InsertObject(obj)

    # Get take structure
    takeData = doc.GetTakeData()
    mainTake = takeData.GetMainTake()

    #Insert new take
    newTake = takeData.AddTake("Test", mainTake, None)

    #Capture descID of paramater to override
    descID = c4d.DescID(c4d.DescLevel(c4d.PRIM_CUBE_LEN, c4d.DTYPE_VECTOR, 0), c4d.DescLevel(c4d.VECTOR_X,c4d.DTYPE_REAL,0))

    #Set take override
    newTake.FindOrAddOverrideParam(takeData, obj, descID, 10)
    
    c4d.EventAdd()


if __name__ == '__main__':
    main()

The problem I had before was my descID was improperly collected. I needed to specify datatypes, as is the case here.

Many thanks,
Rob

Hi, I am having difficulty generating take overrides with ‘FindOrAddOverrideParam()’. When I run my script it creates a set of takes with an override but no value.

My script does ‘work’ if I use ‘OverrideNode()’ instead, but this overrides all of the parameters for the given object, which is much more than I want or need.

My code runs from a Python tag and is activated by a user data button. The intention is to increment the user data by one for each child object.

Any assistance would be greatly appreciated.

import c4d

def createTake():
    # Get existing take structure
    take_data = doc.GetTakeData()
    main_take = take_data.GetMainTake()

    # Get Selector child objects
    obj = op.GetObject()
    
    # Create header take
    select_take = take_data.AddTake("Selector", main_take, None)
    select_take.SetName(obj.GetName())

    child = obj.GetDown()

    #records original user value, used with OverrideNode()
    originalSelection = obj[c4d.ID_USERDATA,2]

    n = 1
    while child:
        print (f"n{n}  obj {child.GetName()}")
        childTake = take_data.AddTake("Selection", select_take, None)
        childTake.SetName(child.GetName())
        obj[c4d.ID_USERDATA,2] = n #increment userdata, used with OverrideNode()
        descId = c4d.DescID(c4d.DescLevel(c4d.ID_USERDATA), c4d.DescLevel(2))
        #childTake.OverrideNode(take_data, obj, False)
        overrideNode = childTake.FindOrAddOverrideParam(take_data, obj, descId, n)
        n = n + 1
        child = child.GetNext()
    
    obj[c4d.ID_USERDATA,2] = originalSelection #restores original user value, used with OverrideNode()
    c4d.EventAdd()


def message(msg_type, data):
    if msg_type == c4d.MSG_NOTIFY_EVENT:
        event_data = data['event_data']
        if event_data['msg_id'] == c4d.MSG_DESCRIPTION_COMMAND:
            desc_id = event_data['msg_data']['id']
            if desc_id[1].id == 5: # The ID of the User Data
                print ("Button Pressed")
                createTake()

def main():
    obj = op.GetObject()

    # Check if we already listen for message
    if not obj.FindEventNotification(doc, op, c4d.NOTIFY_EVENT_MESSAGE):
        obj.AddEventNotification(op, c4d.NOTIFY_EVENT_MESSAGE, 0, c4d.BaseContainer())