Thanks everyone for the help, I figured it out. I tried the plugin on several dozen different models - no errors were found. I hope it will be useful to someone.
Download glb_import plugin

@m_adam Thank you very much! This is what I was looking for.

@m_adam Thank you very much for your reply. Unfortunately, this solution does not suit me and I will have to recreate the menu manually. Export is carried out automatically in certain situations and the export settings menu should be in a separate "Settings" window.

Hello everyone. I want to attach in my CommandData plugin interface an export menu like fbx (e.g. using AttachSubDialog). So that it displays up-to-date information with access to export presets. If this is possible then how?
If I change any settings in my plugin window, will those changes be applied to the global export settings? If so, how can this be avoided?
Thanks!

Hello everyone. I have created two UserAreas and I want to drag objects between them. Can you please tell me how to implement this?

def __init__(self):
    self.area1 = DraggingArea1()
    self.area2 = DraggingArea2()

def CreateLayout(self):
    self.AddUserArea(1000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)
    self.AttachUserArea(self.area1, 1000)

    self.AddUserArea(2000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)
    self.AttachUserArea(self.area2, 2000)
    return True

@Macsmiller I apologize for the late reply. Here is the plugin.
glTF Importer plugin

I managed to finish it and integrate it into Cinema 4D. You can follow the updates here:
glTF Importer topic

Maybe I am asking a question in the wrong topic - where can I find some sample code that can be used to create various import settings and write them to default presets.lib4d?

For some reason that I do not understand, the modifier keys did not work before, now they work. Implementation of the plugin via UserArea instead of GeDialog will be more convenient, thank you for your answers, I will study this part of the SDK further.

Hello! I created an interactive toolbar where content (plugins and scripts) appear depending on the conditions set in the plugin settings.

The problem is that many of my scripts have multiple trigger modes with modifier keys, and I call them using the c4d.CallCommand(id) command.
I can find out which key is pressed like this:

bc = c4d.BaseContainer()
c4d.gui.GetInputState(c4d.BFM_INPUT_KEYBOARD, c4d.BFM_INPUT_CHANNEL, bc)
key = bc[c4d.BFM_INPUT_QUALIFIER]

How to run a c4d.CallCommand(id) given the key pressed?

I use c4d.CallCommand(id) because I first create a list of dictionaries, each of which describes a button and its logic. Here is the dictionary example:

section = 'button1'
Btype = 'button'
number = 1     # for sorting buttons
pID = 600000028
types = [5100, 5101]
logic_modes = [11, 5, 6, 13]
selection = 'True'

{'name': section, 'type': Btype, 'number': number, 'plugin_id': pID, 'obj_types': types, 'logic_modes': modes, 'selection': selection}

I write data to an ini file using configparser. After reading the data from the file, I register each button under the plugin id and check if it was clicked:

def Command(self, paramid, msg):
    for button in self.button_data:
        if button['type'] == 'button' and paramid == button['plugin_id']:
            c4d.CallCommand(button['plugin_id'])
    return True

I hope this description will help you better understand my problem. Thanks!

Thanks everyone for the help, I figured it out. I tried the plugin on several dozen different models - no errors were found. I hope it will be useful to someone.
Download glb_import plugin

Hello everyone! I created a plugin for importing glb/gltf (using the gltfio library), however I am having trouble extracting textures from glb. At the moment, the task is to save the texture to a folder with the name described below (material-name_channel.jpg / png). Please tell me how to solve this problem?

def GLB_textures(self, glb):   # C:\Users\%USERNAME%\Desktop\123.glb

    folder , glb_name = os.path.split(glb)
    tex_folder = os.path.join(folder, glb_name + '_tex')

    try : os.mkdir(tex_folder )
    except : print('Error create folder %s' % tex_folder)

    if glb.data.textures is None:
        return

    for texture in glb.data.textures:
        image = glb.data.images[texture.source]         # gltfio.com.gltf2_io.Image instance
        full_path = os.path.join(tex_folder, image.name+'.jpg') # 'tex_folder' + 00000_basecolor.jpg

        try : image.Save(full_path, c4d.FILTER_JPG, None, c4d.SAVEBIT_0)
        except : print 'Error saving image %s' % full_path