Blender - glTF Variants -> individual USDZs

batch_export_variants.py

# exports each selected object into its own file

import bpy
import os

# export to blend file location
basedir = os.path.dirname(bpy.data.filepath)

if not basedir:
    raise Exception("Blend file is not saved")

view_layer = bpy.context.view_layer

obj_active = view_layer.objects.active
selection = bpy.context.selected_objects

bpy.ops.object.select_all(action='DESELECT')

for obj in selection:

    obj.select_set(True)

    # some exporters only use the active object
    view_layer.objects.active = obj

    name = bpy.path.clean_name(obj.name)
    fn = os.path.join(basedir, name)

    # loop through variants
    gltf2_active_variant = bpy.data.scenes[0].gltf2_active_variant

    # loop on all mesh                
    if obj.type == "MESH":
        mesh = obj.data
        if bpy.data.scenes[0].get('gltf2_KHR_materials_variants_variants') and len(bpy.data.scenes[0].gltf2_KHR_materials_variants_variants) > 0:
            i = 0
            for v in bpy.data.scenes[0].gltf2_KHR_materials_variants_variants:
                name = v.name
                idx = i
#                seems to be a bug?
#                v.variant_idx
                
                print("Exporting " + name +":"+ str(idx))
                
                bpy.context.scene.gltf2_active_variant = idx
                bpy.ops.scene.gltf2_display_variant()
                            
                bpy.ops.wm.usd_export(filepath=fn + "_variant_" + name +".usdz", selected_objects_only=True)
                i = i + 1
            else:
                print("no variants found")
        else:
            # debugging stuff
            print(len(bpy.data.scenes[0].gltf2_KHR_materials_variants_variants))
            print(bpy.data.scenes[0].get('gltf2_KHR_materials_variants_variants'))
    else:
        print("Not a mesh?")

    obj.select_set(False)

    print("written:", fn)


view_layer.objects.active = obj_active

for obj in selection:
    obj.select_set(True)