S22: c4d.MCOMMAND_SPLIT returns a Bool instead of a List, while it returned a list in R21 and earlier versions

Awesuus

Hey guys, i have a script which uses the c4d.utils.SendModelingCommand until recently this returned a list to me. https://developers.MAXON.net/docs/Cinema4DPythonSDK/html/modules/c4d.utils/index.html#c4d.utils.SendModelingCommand

This function either returns a boolean, or a list. Up until R21 the following code returned a list to me. But as of S22 i get returned the bool true, which signifies it ran succesfully, but i cant seem to retrieve the list.

Any help on how i can get the list ( by passing a parameter or anything else ) would be appreciated.

Heres the related snippet of my code

selId = []
    sel = op.GetPolygonS()
    for index, selected in enumerate(sel.GetAll(polyCnt)):
        if not selected: continue
        selId.append(index)
    allPolys = [n for n in allPolys if n not in selId]
    settings = c4d.BaseContainer()
    res = utils.SendModelingCommand(command = c4d.MCOMMAND_SPLIT,
                                list = [op],
                                mode = c4d.MODELINGCOMMANDMODE_POLYGONSELECTION,
                                bc = settings,
                                doc = doc)

after running this script, res is now true instead of a List

many thanks in advance.

m_adam

Hi @Awesuus first of all welcome in the plugincafe community

Unfortunately, I wasn't able to reproduce your result in S22 and we correctly had a list returned.
So what's your exact Cinema 4D Version? ( I tested on S22.118).
Could you upload the Cinema 4D file where you are experiencing this issue?

Thanks in advance,
Cheers,
Maxime.

Awesuus

Hi Maxime,
Thank you so much for your reply. I also work in S22.118.

Here's the whole script that I'm trying to get to work:

import c4d
from c4d import gui,utils

def main():
    if op.GetType() != c4d.Opolygon : return
    sel = op.GetPolygonS()
    polyCnt = op.GetPolygonCount()
    allPolys = range(polyCnt)
    doc.StartUndo()
    null = c4d.BaseObject(c4d.Onull)
    null[c4d.ID_BASELIST_NAME] = op[c4d.ID_BASELIST_NAME]+"_Segments"
    null.SetMg(op.GetMg())
    cntr = 0
    while allPolys:
        settings = c4d.BaseContainer()
        settings[c4d.MDATA_FILLSEL_START_POLY] = allPolys[0]
        utils.SendModelingCommand(command = c4d.ID_MODELING_FILL_SELECTION_TOOL,
                                    list = [op],
                                    mode = c4d.MODELINGCOMMANDMODE_EDGESELECTION,
                                    bc = settings,
                                    doc = doc)
        selId = []
        sel = op.GetPolygonS()
        for index, selected in enumerate(sel.GetAll(polyCnt)):
            if not selected: continue
            selId.append(index)
        allPolys = [n for n in allPolys if n not in selId]
        settings = c4d.BaseContainer()
        res = utils.SendModelingCommand(command = c4d.MCOMMAND_SPLIT,
                                    list = [op],
                                    mode = c4d.MODELINGCOMMANDMODE_POLYGONSELECTION,
                                    bc = settings,
                                    doc = doc)
        
        res[0][c4d.ID_BASELIST_NAME] = op[c4d.ID_BASELIST_NAME]
        res[0].InsertUnderLast(null)
        res[0].SetMg(op.GetMg())
        sel.DeselectAll()
        cntr += 1
    doc.InsertObject(null)
    doc.AddUndo(c4d.UNDOTYPE_NEW, null)
    doc.EndUndo()
    c4d.EventAdd()


if __name__=='__main__':
    main()

What I'm trying to get it to do is explode the mesh by edge selection, so that it creates a new null with the separate objects. The c4d file below is just a scene with a sphere with edge selections.

test.c4d

m_adam

Thanks for the complete code, the issue is not located in the MCOMMAND_SPLIT but in the ID_MODELING_FILL_SELECTION_TOOL, within the S22 development cycle, parameters IDs changed but the new ones were not exposed to Python (I've created a bug report) so you need to hardcode them, like so

startPolyID = c4d.MDATA_FILLSEL_START_POLY if c4d.GetC4DVersion() < 21600 else 1100 # MDATA_FILL_POLYGON_INDEX in C++
selectionTypeID = c4d.MDATA_FILLSEL_SELECTION if c4d.GetC4DVersion() < 21600 else 1110 # MDATA_FILL_SELECTION_TYPE in C++

And here your code adapted to work

import c4d
from c4d import gui,utils

def main():
    if op.GetType() != c4d.Opolygon : return
    sel = op.GetPolygonS()
    polyCnt = op.GetPolygonCount()
    allPolys = range(polyCnt)
    doc.StartUndo()
    null = c4d.BaseObject(c4d.Onull)
    null[c4d.ID_BASELIST_NAME] = op[c4d.ID_BASELIST_NAME]+"_Segments"
    null.SetMg(op.GetMg())
    cntr = 0
    while allPolys:
        settings = c4d.BaseContainer()
        startPolyID = c4d.MDATA_FILLSEL_START_POLY if c4d.GetC4DVersion() < 21600 else 1100 # MDATA_FILL_POLYGON_INDEX in C++
        selectionTypeID = c4d.MDATA_FILLSEL_SELECTION if c4d.GetC4DVersion() < 21600 else 1110 # MDATA_FILL_SELECTION_TYPE in C++
        
        settings[startPolyID] = allPolys[0]
        settings[selectionTypeID] = c4d.SELECTION_NEW # Or SELECTION_ADD or SELECTION_SUB

        utils.SendModelingCommand(command = c4d.ID_MODELING_FILL_SELECTION_TOOL,
                                    list = [op],
                                    mode = c4d.MODELINGCOMMANDMODE_EDGESELECTION,
                                    bc = settings,
                                    doc = doc)
        selId = []
        sel = op.GetPolygonS()
        for index, selected in enumerate(sel.GetAll(polyCnt)):
            if not selected: continue
            selId.append(index)
            
        allPolys = [n for n in allPolys if n not in selId]
        settings = c4d.BaseContainer()
        res = utils.SendModelingCommand(command = c4d.MCOMMAND_SPLIT,
                                    list = [op],
                                    mode = c4d.MODELINGCOMMANDMODE_POLYGONSELECTION,
                                    bc = settings,
                                    doc = doc)
        
        res[0][c4d.ID_BASELIST_NAME] = op[c4d.ID_BASELIST_NAME]
        res[0].InsertUnderLast(null)
        res[0].SetMg(op.GetMg())
        sel.DeselectAll()
        cntr += 1
    doc.InsertObject(null)
    doc.AddUndo(c4d.UNDOTYPE_NEW, null)
    doc.EndUndo()
    c4d.EventAdd()


if __name__=='__main__':
    main()

Cheers,
Maxime.

Awesuus

Thank you so much, this works like a charm!!!