How to restore changes after exporting?

Question

Before exporting to FBX I modify the object's name, location, parent, etc.

All the exporting happens in a for loop of selected objects.

So I need to restore it after every export.

Example script:

import bpy
from bpy import context
import os
import random
filepath = "C:/Users/karan/Desktop/"
override = context.copy()
for object in context.selected_objects:
    # It's a simple modification, but I will have some complex modifications.
    object.location = (random.random(), random.random(), random.random())
# export
override['selected_objects'] = [object]
with context.temp_override(**override):
    bpy.ops.export_scene.fbx(filepath=os.path.join(filepath, f"{object.name}.fbx"), check_existing=False, use_selection=True)

# restore
bpy.ops.wm.revert_mainfile()

I get this error

ReferenceError: StructRNA of type Object has been removed

How to fix this?

And how to add a progress bar while exporting?

import bpy
import os
import random
class EXPORT_OT_export_fbx(bpy.types.Operator):
    """Tooltip"""
    bl_idname = "export.fbx"
    bl_label = "Export FBX"
def execute(self, context):
    filepath = "C:/Users/karan/Desktop/"
    names = [obj.name for obj in context.selected_objects]

    for name in names:
        object = bpy.data.objects[name]
        object.location = (random.random(), random.random(), random.random())

        override = bpy.context.copy()
        override['selected_objects'] = [object]
        with context.temp_override(**override):
            bpy.ops.export_scene.fbx(filepath=os.path.join(filepath, f"{object.name}.fbx"), use_selection=True)

        # restore
        bpy.ops.wm.revert_mainfile()

    return {'FINISHED'}



class EXPORT_PT_export_fbx(bpy.types.Panel):
    bl_label = "Export"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Export"
def draw(self, context):
    layout = self.layout

    if context.scene.export_progress >= 0:
        layout.enabled = False
        layout.prop(context.scene, 'export_progress', slider=True)
    else:
        layout.operator("export.fbx")



def register():
    bpy.utils.register_class(EXPORT_OT_export_fbx)
    bpy.utils.register_class(EXPORT_PT_export_fbx)
bpy.types.Scene.export_progress = bpy.props.IntProperty(name = 'Exporting...', subtype = 'PERCENTAGE', min = -1, soft_min = 0, soft_max = 100, max = 100, default = -1)



def unregister():
    bpy.utils.unregister_class(EXPORT_OT_export_fbx)
    bpy.utils.unregister_class(EXPORT_PT_export_fbx)
del bpy.types.Scene.export_progress



if name == "main":
    register()

Answer 1

This should work, if not tell me I'll fix it

import bpy
from bpy import context
import os
import random
filepath = "C:/Users/karan/Desktop/"
names = [obj.name for obj in context.selected_objects]
for name in names:
    object = bpy.data.objects[name]
    object.name += ".fbx"
    object.location = (random.random(), random.random(), random.random())
override = bpy.context.copy()
override['selected_objects'] = [object]
with context.temp_override(**override):
    bpy.ops.export_scene.fbx(filepath=os.path.join(filepath, object.name), check_existing=False, use_selection=True)

# restore
bpy.ops.wm.revert_mainfile()

---

To show the progress after reloading the blend file, you can refer to this

import bpy
import os
import random
from bpy.app.handlers import persistent
is_button_press = [False]
data = {}
@persistent
def when_new_file(dummy):
    print("new file detected")
    do_job()
def init_job():
    print("init job")
    data["job_ind"] = 0
    data["job_ind_end"] = 100
    bpy.context.scene.export_progress = 0
    bpy.app.handlers.load_post.append(when_new_file)
    bpy.ops.wm.revert_mainfile()
def do_job():
    print("do_job, ind= ", data["job_ind"])
    # do something you want here
if data["job_ind"] == data["job_ind_end"]:
    end_job()
else:
    bpy.app.timers.register(next_job)


def next_job():
    data["job_ind"] += 1
    bpy.ops.wm.revert_mainfile()
    if "job_ind" in data:
        bpy.context.scene.export_progress = data["job_ind"] * 100 // (data["job_ind_end"] + 1)
def end_job():
    print("job done")
    bpy.app.handlers.load_post.remove(when_new_file)
    is_button_press[0] = False
    data.clear()
    bpy.context.scene.export_progress = -1
    bpy.ops.wm.revert_mainfile()
class Progress_test(bpy.types.Operator):
    bl_idname = "wm.test"
    bl_label = "Progress_test"
# not possible running in operator using forloop
# because after running bpy.ops.wm.revert_mainfile(), operator cannot access, blender will crash
def execute(self, context):
    if not is_button_press[0]:
        is_button_press[0] = True
        bpy.app.timers.register(init_job)
    return {'FINISHED'}



class TEST_PT_PANEL(bpy.types.Panel):
    bl_label = "Test Panel"
    bl_space_type = 'VIEW_3D'
    bl_region_type = 'UI'
    bl_category = "Item"
def draw(self, context):
    layout = self.layout

    if is_button_press[0]:
        layout.enabled = False
        layout.prop(context.scene, 'export_progress', slider=True)
    else:
        layout.operator("wm.test")



def register():
    bpy.utils.register_class(Progress_test)
    bpy.utils.register_class(TEST_PT_PANEL)
bpy.types.Scene.export_progress = bpy.props.IntProperty(name = 'Exporting...', subtype = 'PERCENTAGE', min = -1, soft_min = 0, soft_max = 100, max = 100, default = -1)



def unregister():
    bpy.utils.unregister_class(Progress_test)
    bpy.utils.unregister_class(TEST_PT_PANEL)
del bpy.types.Scene.export_progress



if name == "main":
    register()

After you testing above script, change the init_job and do_job function

filepath = "..."
def init_job():
    print("init job")
    data["job_ind"] = 0
    data["names"] = [obj.name for obj in bpy.context.selected_objects]
    data["job_ind_end"] = len(data["names"]) - 1
    bpy.context.scene.export_progress = 0
    bpy.app.handlers.load_post.append(when_new_file)
    bpy.ops.wm.revert_mainfile()
def do_job():
    print("do_job, ind= ", data["job_ind"])
name = data["names"][data["job_ind"]]
object = bpy.data.objects[name]
object.location = (random.random(), random.random(), random.random())

override = bpy.context.copy()
override['selected_objects'] = [object]
with bpy.context.temp_override(**override):
    bpy.ops.export_scene.fbx(filepath=os.path.join(filepath, f"{object.name}.fbx"), use_selection=True)

if data["job_ind"] == data["job_ind_end"]:
    end_job()
else:
    bpy.app.timers.register(next_job)