Load ONLY specific Objects or Collections with Apend Scene?

GLiFTeK wrote:

Is there a way instead, to have a .gltf file full of all of them, and be able to designate which objects, or collections of objects would be loaded from the scene?

ATM the engine needs to load the whole gltf file in order to access its contents (i.e. no streaming).

GLiFTeK wrote:

Further, are the puzzles “append scene” and “load scene” actually loading the entire .gltf OR is it loading a specific “scene” (as per the name) in blender that can be designated to be loaded with it’s objects…

Multiple scenes are exported to gltf, but only the first scene is available after loading.

@jem thank you very much for sharing this technique!

@GlifTek, sorry for my delay in responding.
I have attached an archive of a simple project that uses this script. You will probably need to edit the python script to suit your requirements. I think that it is reasonably simple. I am not a programmer, and I was able to cobble it together.

How to use this script.
1. Place all of your objects in the object_library.blend file.
2. Edit the CSV file. The CSV has two columns, ObjectName and BlenderFileName. This allows the GLTF file name and the object name to differ if needed.
3. Open gltf_mass_export_example.blend
4. Edit the gltf_export_script.py script. At a minimum, you will need to change the value for the fp variable to match your environment.
5. Run the script.

For each object listed in the CSV, the script will append the object from the object_library.blend, save it at a separate .blend file, save it as a separate .gltf file, and then delete the object from the working blend file.

You will end up with a directory of blend files and another directory of gltf files.

The script is flexible. I have used it to perform batch transformations. There are some commented examples included.

Give it a try and see what you can do with it. I find this type of scripted batch processing to be very powerful.

# application directory
fp = "D:\\verge3d\\verge3d\\applications\\gltf_mass_export_example\\"
# subdirectory where exported blender files will be placed
dir_blender = "blender_files"
# subdirectory where exported gltf files will be placed
dir_gltf = "gltf_files"
# name of file containing all of the objects to be extracted and saved as gltf files
combined_object_data_file = "object_library.blend"
# CSV file with the names of the objects to be extracted and the name of the gltf file to create from each object
csv_file_name = "my_export.csv"
with open( fp + csv_file_name ) as csvfile:
    reader = csv.DictReader( csvfile, dialect='excel')
    for row in reader:
        # Deselect all objects
        bpy.ops.object.select_all(action='DESELECT')
        obj_name = row['ObjectName']
        file_name = row['BlenderFileName']
        directory = fp + combined_object_data_file + '\\Object\\'
        filepath = directory + obj_name 
        bpy.ops.wm.append(filepath=filepath, filename=obj_name, directory=directory)
        #set the imported object active
        bpy.context.view_layer.objects.active = bpy.context.selected_objects[0]
        #print(bpy.context.active_object.name) 
        #bpy.context.active_object.name = bpy.context.active_object.name.upper()
        #if you need to apply any transformations to each object, ues functions such as the following:
        #bpy.ops.transform.resize(value=(0.0254, 0.0254, 0.0254))
        #bpy.ops.object.transform_apply(location=False, rotation=True, scale=True)
        #bpy.context.active_object.name = bpy.context.active_object.name.upper()
        bpy.ops.wm.save_as_mainfile(filepath=fp + dir_blender + '\\' + file_name + '.blend')
        bpy.ops.export_scene.v3d_gltf(filepath=fp + dir_gltf + '\\' + file_name + '.gltf')
        bpy.ops.object.delete() 

I have one more hint for using this script. If you want a specific Verge3D export option to be applied to all of the GLTF files, set that Verge3D export option in the gltf_mass_export_example.blend file. All of the .blend files and .gltf files will inherit that option.
For example, you might want to enable LZMA compression for all exports. In that case, check the LZMA checkbox in the Verge3D section of the render properties tab in the gltf_mass_export_example.blend. This technique avoids having to remember to enable that option on hundreds of separate blender files.

@GlifTek, my technique is similar to @jem ‘s but even simpler. I’m using 3dsmax and have made a script which export every top object-group(s) (no parents, only children) of the selection into a separate file with the name of the group. Simple group together what should go into one file, select all groups you want to export and click a button. My script can export to multiple file formats (every one is a button), the exportpath is saved with the max-file and the option to move the groups to scene origin prior to export and back after. So you can array the groups next to each other work on them and on export they land on 0,0,0.

That would be useful to see an example. Mind sharing?