Hello @ferdinand,
Thank you! His proposal was the best way to solve my problem.
Greetings,
JH23

To be honest, I don't even know what happens, the line of code that I put is all the code there is, even so, I admit that I could not explain myself well.
I tried what you proposed and didn't see much of a difference, but trying a few things I solved my problem as follows

Code before correcting

import c4d
from c4d import gui
def main():
    c4d.documents.MergeDocument(doc,'preset://name',c4d.SCENEFILTER_MATERIALS | c4d.SCENEFILTER_OBJECTS))
if __name__=='__main__':
    main()

Corrected code

import c4d
from c4d import gui
def main():
    doc.StartUndo()
    doc.AddUndo(c4d.UNDOTYPE_NEW, c4d.documents.MergeDocument(doc,'preset://name',c4d.SCENEFILTER_MATERIALS | c4d.SCENEFILTER_OBJECTS))
    doc.EndUndo()
    c4d.EventAdd()
if __name__=='__main__':
    main()

Even so, I would like to investigate your proposal and I really appreciate your help.

I have been using commonly what is

c4d.documents.MergeDocument(doc,'preset://direction',c4d.SCENEFILTER_OBJECTS | c4d.SCENEFILTER_MATERIALS)

that does not present errors when reversing its action, but an error that I realized is that if I try to return to when I had the preset (for this the preset had texture) it doesn't load its texture or if it does load I had to go back several times, does anyone know why this happens?

Hi
Thank you for solving my question, and thank you very much also for the advice.

@m_magalhaes

Hi

in itself the problem is that when performing the complete action when going back the object is outside the father, since it was first created and later placed inside the father

import c4d
from c4d import documents, plugins

def main():
    c4d.documents.MergeDocument(doc,"file location",7) #the preset has already been added
    doc.StartUndo()
    child = doc.GetActiveObjects(c4d.GETACTIVEOBJECTFLAGS_NONE)
    for A in child:
        doc.AddUndo(c4d.UNDOTYPE_CHANGE, A)
        A.InsertUnder(father)#the parent would be defined by a link
    doc.EndUndo()
    c4d.EventAdd()

I did this since when adding the preset it is already selected, use this to place it inside another object

Hi
I have been working on a userdata button that places a preset in the environment, I also wanted to put it inside the end of a joint, my problem is that when performing these steps, when going back the preset is outside the joint, the code generates the preset and then place it inside the board, is there a way to do it directly?

Hi.
Oh I understand, thanks for your answer, it has helped me a lot.

I had a doubt, I wanted to place an established texture on the material created, but I don't know how, since the textures part is not a simple link type data in itself, but if I link directly where the link of the image is born is a bitmap but I don't know how it relates to the material.

import c4d

def main():
    mat = c4d.BaseList2D(c4d.Mmaterial)
    doc.StartUndo()
    doc.AddUndo(c4d.UNDOTYPE_NEW, mat)
    doc.InsertMaterial(mat)
    mat[c4d.MATERIAL_USE_REFLECTION] = False
    #mat[c4d.MATERIAL_COLOR_SHADER] ?
    #Bitmap[c4d.BITMAPSHADER_INTERPOLATION]?
    #Bitmap[c4d.BITMAPSHADER_FILENAME]?
    doc.EndUndo()
    c4d.EventAdd()

# Execute main()
if __name__=='__main__':
    main()

@Cairyn Thanks, I'll check it

Hi @m_adam I mean that when creating an Object with BaseObject, when going back it remains in the environment.
Cheers