Hi @ferdinand, and thank you!
Your proof-of-concept and pointing me toward mxutils.GetSceneGraphString() was exactly what I needed to solve this.

By using the scene graph dumper on a native UI-generated Motion Source from a rigged character, I realized it's just a standard Ojoint hierarchy with normal CTrack objects.
I used GetClone(c4d.COPYFLAGS_NO_HIERARCHY) to perfectly replicate the Ojoint skeleton and injected the time variables into the container, and it maps and plays back perfectly. Thanks again.

Hi everyone,

I am trying to fully automate the creation of a Motion Clip via Python, completely bypassing the UI popup from the "Add Motion Clip" command. I need to be able to set parameters through code.

I understand from previous threads that the NLA system might not be fully exposed in the Python API. I was successfully able to use branch traversal to find the NLA Base and allocate the MT_LAYER and MT_CLIP using c4d.BaseList2D().

This post was a good source of info:
http://developers.maxon.net/forum//post/55975

However, my roadblock is creating the actual Motion Source to link to the clip. When I try to allocate it, I get an allocation error.

Here is the exact line:

import c4d
MT_SOURCE = 465003004 # ID for Motion Source

def main():
    # Attempting to create the Motion Source container
    motion_source = c4d.BaseList2D(MT_SOURCE) 
    
if __name__=='__main__':
    main()

BaseException: the plugin 'c4d.BaseList2D' (ID 465003004) is missing. Could not allocate instance.

I have two questions:

• Is there an undocumented helper function, message, or workaround to allocate a Motion Source (MT_SOURCE) in Python so I can manually insert CTrack data into it?

• Alternatively, since "Add Motion Clip" is a CommandData plugin, is there any hidden way to pass a settings container to it via Python (similar to MSG_RETRIEVEPRIVATEDATA with SceneSavers) so it executes silently without the UI popup?

Any guidance or confirmation if this is strictly locked to the internal C++ core would be hugely appreciated!

Thank you,
Jaroslav