I still have problems to understand what you want to do. This also sounds more and more like an end user problem to me. If you think ghosting is not working for a particular setup (you seem to hint at the fact that it does not work for Character Animation) you should contact end user support via our Support Center. SDK support is purely meant for our APIs.

Cheers,
Ferdinand

Welcome to the Maxon developers forum and its community, it is great to have you with us!

Getting Started

Before creating your next postings, we would recommend making yourself accustomed with our forum and support procedures. You did not do anything wrong, we point all new users to these rules.

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It is strongly recommended to read the first two topics carefully, especially the section Support Procedures: Asking Questions.

About your First Question

Without a more concrete description of what you want to do, it will be hard to help you. We also cannot write solutions for you. For all further support requests, you will have to show us the code you wrote.

With that being said, and with a bit reading between the lines, here is a script which:

• Adds a display tag to the currently active object when there is none.
• Enables both ghosting in the tag and the currently active viewport when it is disabled, or disables it when it is enabled.

I.e., you could use this to toggle ghosting for the currently selected object.

Cheers,
Ferdinand

"""Demonstrates how to toggle the ghosting state of an object in Cinema 4D.

The script will toggle the ghosting state of the primary selected object in the currently active
document. If the object has no display tag, a new one will be created. If the object already has a
display tag, the script will toggle the ghosting state of the tag.

Must be run as a Script Manager script.
"""

import c4d
import mxutils

doc: c4d.documents.BaseDocument  # The currently active document.
op: c4d.BaseObject | None  # The primary selected object in `doc`. Can be `None`.

def main() -> None:
    """Called by Cinema 4D when the script is being executed.
    """
    if op is None:
        c4d.StatusSetText("No object selected.")
        return
    
    # Get all display tags on the object.
    tags: list[c4d.BaseTag] = [tag for tag in op.GetTags() if tag.CheckType(c4d.Tdisplay)]

    # Select the first display tag or create a new one when there is none.
    displayTag: c4d.BaseTag = tags[0] if tags else mxutils.CheckType(op.MakeTag(c4d.Tdisplay))

    # Get the ghosting state of the display tag.
    isGhosting: bool = displayTag[c4d.ONION_USE]

    # Toggle ghosting off.
    if isGhosting:
        # Turn off ghosting by setting the `c4d.ONION_USE` parameter to `False`.
        displayTag[c4d.ONION_USE] = False

        # Alternatively, you can also remove the display tag from the object. This will be a bit 
        # cleaner as we will not leave back dormant display tags on objects. But it without further 
        # checks, we would also delete manually created display tags which might have other important
        # settings.
        # displayTag.Remove()
    # Toggle ghosting on.
    else:
        displayTag[c4d.ONION_USE] = True
        # Make sure that ghosting is also enabled in the currently active viewport.
        viewport: c4d.BaseDraw = doc.GetActiveBaseDraw()
        viewport[c4d.BASEDRAW_DISPLAYFILTER_ONION] = True
    
    c4d.EventAdd()
        
if __name__ == '__main__':
    main()