recreate_layers_from_3ds_to_c4d

import c4d
import json

def create_hierarchy(parent, data, doc):
    for item in data:
        name = item["name"] + "_grp"


        # Check if the object already exists
        obj = doc.SearchObject(name)
        
        # If it does not exist, create a new null object
        if obj is None:
            obj = c4d.BaseObject(c4d.Onull)
            obj.SetName(name)
            doc.InsertObject(obj)

        # If a parent is provided, set the parent of the new object
        if parent:
            obj.InsertUnder(parent)

        # Recursively add children
        if "children" in item and item["children"]:
            create_hierarchy(obj, item["children"], doc)

def create_layers():
    # Path to the JSON file
    param_path = r"C:/users/BT/Desktop/layers_hierarchy.json"
    
    with open(param_path, "r") as read_file:
        data = json.load(read_file)

    # Get the active document
    doc = c4d.documents.GetActiveDocument()

    # Start an undo block
    doc.StartUndo()

    try:
        # Create the hierarchy
        create_hierarchy(None, data, doc)
    finally:
        # End the undo block
        doc.EndUndo()
    
    # Refresh Cinema 4D to show the new objects
    c4d.EventAdd()

def reparent_objects():
    param_path = r"C:/users/BT/Desktop/layers_hierarchy_with_geo.json"

    doc = c4d.documents.GetActiveDocument()
    with open(param_path, "r") as read_file:
        data = json.load(read_file)

    doc.StartUndo()

    for d, k in data.items():
        print ("group_name", d)

        null_obj = c4d.BaseObject(c4d.Onull)
        null_obj.SetName(d + "_grp")
        doc.InsertObject(null_obj)

        for obj_name in k[0]:
            scene_obj = doc.SearchObject(obj_name)
            result = False
            if scene_obj:
                result = True

                scene_obj.InsertUnder(null_obj)

            if not result:
                print (obj_name, "does not exist")
        print ("=====")

    doc.EndUndo()

# Execute the main function
if __name__ == '__main__':
    reparent_objects()
    create_layers()