kb3d_to_asset_browser.py

import bpy

def create_assets_from_empty_children():
    # Get all empties in the scene
    empties = [obj for obj in bpy.data.objects if obj.type == 'EMPTY']
    
    for empty in empties:
        # Get direct mesh children
        children = [obj for obj in empty.children if obj.type == 'MESH']
        if len(children) < 1:
            continue
        
        # Prepare selection
        bpy.ops.object.mode_set(mode='OBJECT')
        bpy.ops.object.select_all(action='DESELECT')
        
        # Select all children and set active object
        for child in children:
            child.select_set(True)
        bpy.context.view_layer.objects.active = children[0]
        
        # Join objects
        bpy.ops.object.join()
        
        # Get resulting object
        joined_obj = bpy.context.active_object
        joined_obj.name = f"{empty.name.rstrip('_grp')}"
        
        # Mark as asset
        joined_obj.asset_mark()
        
        # Generate asset preview
        joined_obj.asset_generate_preview()

if __name__ == "__main__":
    create_assets_from_empty_children()