@Dunhou I understand now. I have tried it successfully. Thank you very much!

@Dunhou
Thank you very much for answering my questions. I saw your library yesterday and tried to write like this

from typing import Optional
import c4d


ID_OCTANE: int = 1029525 # Octane 
ID_REDSHIFT: int = 1036219 # Redshift
ID_ARNOLD: int = 1029988 # Arnold
ID_VRAY: int = 1053272
ID_CORONA: int = 1030480
ID_LOOKS: int = 1054755
ID_CENTILEO: int = 1036821
ID_OCTANE_VIDEO_POST = 1029525 # octane render
file_path="C:/Users/admin/Documents/WXWork/1688858265477290/Cache/File/2024-09/OC_light/11.png"

doc: c4d.documents.BaseDocument  # The active document
op: Optional[c4d.BaseObject]  # The active object, None if unselected

def GetVideoPost(document: c4d.documents.BaseDocument = None, videopost: int = ID_REDSHIFT) -> Optional[c4d.documents.BaseVideoPost]:
    """
    Get the videopost of given render engine of filled document.

    Args:
        document (c4d.documents.BaseDocument, optional): Fill None to check active documents. Defaults to None.
        videopost (int, optional): The id of the videopost. Defaults to ID_REDSHIFT.

    Returns:
        Optional[c4d.documents.BaseVideoPost]: The videopost we get.
    """
    if not document:
        document = c4d.documents.GetActiveDocument()

    rdata: c4d.documents.RenderData = document.GetActiveRenderData()
    vpost: c4d.documents.BaseVideoPost = rdata.GetFirstVideoPost()
    theVp: c4d.documents.BaseVideoPost = None

    while vpost:
        print(vpost.GetType())
        if vpost.GetType() == int(ID_OCTANE_VIDEO_POST):
            theVp = vpost
        vpost = vpost.GetNext()
    return theVp
def main():

    OctaneRenderer = GetVideoPost(c4d.documents.GetActiveDocument(),ID_OCTANE)

    OctaneRenderer[c4d.SET_PASSES_FILEFORMAT] = 6 # Octane PNG, 6 = PNG
    OctaneRenderer[c4d.SET_PASSES_SAVE_MAINPASS] = True
    OctaneRenderer[c4d.SET_PASSES_ENABLED] = True
    OctaneRenderer[c4d.SET_PASSES_SAVEPATH] = file_path

    c4d.EventAdd()

if __name__=='__main__':
    main()

But there are no images generated in the directory. What could be the reason?

How to use Python to implement rendering with Octane in C4D and export as PNG