feat(auto_export): since all variations of using depsgraphs_update & co failed to be reliable, switching to brute force

* aka added basics of serialization of scene(s) & brute compare
 	* added basics for transforms, custom properties, meshes, cameras & lights, & armatures
 * should only run on save as I can imagine it could get quite costly, computation wise
 * added some boilerplate for determining changed objects
 * not hooked up to actual exporter yet
 * already way more reliable than the depsgraph:
  * ignores selections & related weird issues
  * undo /redo proof
  * expandable

tools/gltf_auto_export/__init__.py

@@ -188,7 +188,11 @@ from bpy.app.handlers import persistent
 
 @persistent
 def post_update(scene, depsgraph):
-    bpy.context.window_manager.auto_export_tracker.deps_update_handler( scene, depsgraph)
+    bpy.context.window_manager.auto_export_tracker.deps_post_update_handler( scene, depsgraph)
+
+@persistent
+def pre_update(scene, depsgraph):
+    bpy.context.window_manager.auto_export_tracker.deps_pre_update_handler( scene, depsgraph)
 
 @persistent
 def post_save(scene, depsgraph):
@@ -198,6 +202,7 @@ def register():
     for cls in classes:
         bpy.utils.register_class(cls)
     # for some reason, adding these directly to the tracker class in register() do not work reliably
+    bpy.app.handlers.depsgraph_update_pre.append(pre_update)
     bpy.app.handlers.depsgraph_update_post.append(post_update)
     bpy.app.handlers.save_post.append(post_save)
 
@@ -214,6 +219,7 @@ def unregister():
         bpy.utils.unregister_class(cls)
     bpy.types.TOPBAR_MT_file_export.remove(menu_func_import)
 
+    bpy.app.handlers.depsgraph_update_pre.remove(pre_update)
     bpy.app.handlers.depsgraph_update_post.remove(post_update)
     bpy.app.handlers.save_post.remove(post_save)
 

tools/gltf_auto_export/auto_export/operators.py

@@ -4,9 +4,11 @@ from bpy.types import Operator
 from bpy_extras.io_utils import ExportHelper
 from bpy.props import (IntProperty)
 
+
 from .preferences import (AutoExportGltfAddonPreferences, AutoExportGltfPreferenceNames)
 from .auto_export import auto_export
 from ..helpers.generate_complete_preferences_dict import generate_complete_preferences_dict_auto
+from ..helpers.serialize_scene import serialize_scene
 
 class AutoExportGLTF(Operator, AutoExportGltfAddonPreferences, ExportHelper):
     """auto export gltf"""
@@ -17,6 +19,7 @@ class AutoExportGLTF(Operator, AutoExportGltfAddonPreferences, ExportHelper):
     # ExportHelper mixin class uses this
     filename_ext = ''
 
+
     #list of settings (other than purely gltf settings) whose change should trigger a re-generation of gltf files
     white_list = ['auto_export',
         'export_main_scene_name',
@@ -198,21 +201,85 @@ class AutoExportGLTF(Operator, AutoExportGltfAddonPreferences, ExportHelper):
             previous_gltf_settings.write(current_gltf_settings.as_string())
 
         return changed
+    
+    def did_objects_change(self):
+        previous_stored = bpy.data.texts[".TESTING"] if ".TESTING" in bpy.data.texts else None # bpy.data.texts.new(".TESTING")
+        current = serialize_scene()
+        if previous_stored == None:
+            print("setting bla")
+            previous_stored = bpy.data.texts.new(".TESTING")
+            previous_stored.write(current)
+            return {}
+        
+        
+        previous = json.loads(previous_stored.as_string())
+        current = json.loads(current)
+
+        changes_per_scene = {}
+        # TODO : how do we deal with changed scene names ???
+        for scene in current:
+            print('scene', scene)
+            changes_per_scene[scene] = {}
+            previous_object_names = list(previous[scene].keys())
+            current_object_names =list(current[scene].keys())
+            #print("previous_object_names", len(previous_object_names), previous_object_names)
+            #print("current_object_names", len(current_object_names), current_object_names)
+
+            """if len(previous_object_names) > len(current_object_names):
+                print("removed")
+            if len(current_object_names) > len(previous_object_names):
+                print("added")"""
+            added =  list(set(current_object_names) - set(previous_object_names))
+            removed = list(set(previous_object_names) - set(current_object_names))
+            print("removed", removed)
+            print("added",added)
+            for obj in added:
+                changes_per_scene[scene][obj] = bpy.data.objects[obj]
+            # TODO: how do we deal with this, as we obviously do not have data for removed objects ?
+            for obj in removed:
+                changes_per_scene[scene][obj] = None # bpy.data.objects[obj]
+
+            for object_name in list(current[scene].keys()): # todo : exclude directly added/removed objects  
+                #print("ob", object_name)
+                if object_name in previous[scene]:
+                    # print("object", object_name,"in previous scene, comparing")
+                    current_obj = current[scene][object_name]
+                    prev_obj = previous[scene][object_name]
+                    same = str(current_obj) == str(prev_obj)
+
+                    if "Camera" in object_name:
+                        pass#print("  current", current_obj, prev_obj)
+                    if "Fox" in object_name:
+                        print("  current", current_obj)
+                        print("  previou", prev_obj)
+                        print("  same?", same)
+                    #print("foo", same)
+                    if not same:
+                        changes_per_scene[scene][object_name] = bpy.data.objects[object_name]
+                    
+            """if len(current[scene]) != len(previous[scene]) :
+                print("toto")"""
+            previous_stored.clear()
+            previous_stored.write(json.dumps(current))
+        print("changes per scene alternative", changes_per_scene)
+
 
     def execute(self, context):    
         #print("execute")
         bpy.context.window_manager.auto_export_tracker.disable_change_detection()
         if self.direct_mode:
             self.load_settings(context)
-        print("toto", self.will_save_settings)
         if self.will_save_settings:
             self.save_settings(context)
 
         if self.auto_export: # only do the actual exporting if auto export is actually enabled
             changes_per_scene = context.window_manager.auto_export_tracker.changed_objects_per_scene
+            changes_per_scene_2 = self.did_objects_change()
+
             #& do the export
-            if self.direct_mode: #Do not auto export when applying settings in the menu, do it on save only                
+            if self.direct_mode: #Do not auto export when applying settings in the menu, do it on save only   
-                #determine changed parameters 
+                # determine changed objects
+                # determine changed parameters 
                 params_changed = self.did_export_settings_change()
                 auto_export(changes_per_scene, params_changed, self)
                 # cleanup 

tools/gltf_auto_export/auto_export/tracker.py

@@ -74,7 +74,32 @@ class AutoExportTracker(PropertyGroup):
         # all our logic is done, mark this as done
 
     @classmethod
-    def deps_update_handler(cls, scene, depsgraph):
+    def deps_pre_update_handler(cls, scene, depsgraph):
+        pass
+        #print("before depsgraph update", scene, depsgraph)
+
+        # only deal with changes if we are NOT in the mids of saving/exporting
+        """if cls.change_detection_enabled:
+            # ignore anything going on with temporary scenes
+            if not scene.name.startswith(TEMPSCENE_PREFIX):
+                print("depsgraph_update_post", scene.name)
+                changed_scene = scene.name or ""
+                #print("-------------")
+              
+                # print("cls.changed_objects_per_scene", cls.changed_objects_per_scene)
+                # depsgraph = bpy.context.evaluated_depsgraph_get()
+                for obj in depsgraph.updates:
+                    #print("depsgraph update", obj)
+                    if isinstance(obj.id, bpy.types.Object):
+                        # get the actual object
+                        object = bpy.data.objects[obj.id.name]
+                        print("  changed object", obj.id.name, "changes", obj, "evalutated", obj.id.is_evaluated, "transforms", obj.is_updated_transform, "geometry", obj.is_updated_geometry)
+                    elif isinstance(obj.id, bpy.types.Material): # or isinstance(obj.id, bpy.types.ShaderNodeTree):
+                        # print("  changed material", obj.id, "scene", scene.name,)
+                        pass"""
+
+    @classmethod
+    def deps_post_update_handler(cls, scene, depsgraph):
         # print("change detection enabled", cls.change_detection_enabled)
 
         """ops = bpy.context.window_manager.operators
@@ -96,17 +121,21 @@ class AutoExportTracker(PropertyGroup):
                 # we set the last operator here so we can clear the specific settings (yeah for overly complex logic)
                 cls.last_operator = active_operator
                 #print("active_operator", active_operator.has_active_exporter_extensions, active_operator.__annotations__.keys(), active_operator.filepath, active_operator.gltf_export_id)
+                return
+            
             if active_operator.bl_idname == "EXPORT_SCENES_OT_auto_gltf":
                 # we force saving params
                 active_operator.will_save_settings = True
                 active_operator.auto_export = True
+                # if we are using the operator, bail out for the rest
                 print("setting stuff for auto_export")
+                return
 
         # only deal with changes if we are NOT in the mids of saving/exporting
         if cls.change_detection_enabled:
             # ignore anything going on with temporary scenes
             if not scene.name.startswith(TEMPSCENE_PREFIX):
-                print("depsgraph_update_post", scene.name)
+                #print("depsgraph_update_post", scene.name)
                 changed_scene = scene.name or ""
                 #print("-------------")
                 if not changed_scene in cls.changed_objects_per_scene:
@@ -118,7 +147,7 @@ class AutoExportTracker(PropertyGroup):
                     if isinstance(obj.id, bpy.types.Object):
                         # get the actual object
                         object = bpy.data.objects[obj.id.name]
-                        print("  changed object", obj.id.name, "changes", obj, "evalutated", obj.id.is_evaluated, "transforms", obj.is_updated_transform, "geometry", obj.is_updated_geometry)
+                        #print("  changed object", obj.id.name, "changes", obj, "evalutated", obj.id.is_evaluated, "transforms", obj.is_updated_transform, "geometry", obj.is_updated_geometry)
                         if obj.is_updated_transform or obj.is_updated_geometry:
                             cls.changed_objects_per_scene[scene.name][obj.id.name] = object
                     elif isinstance(obj.id, bpy.types.Material): # or isinstance(obj.id, bpy.types.ShaderNodeTree):
@@ -175,9 +204,9 @@ class AutoExportTracker(PropertyGroup):
 
         addon_prefs = SimpleNamespace(**tmp)
 
-        print("cls.changed_objects_per_scene", cls.changed_objects_per_scene)
+        #print("cls.changed_objects_per_scene", cls.changed_objects_per_scene)
         (collections, collections_to_export, library_collections, collections_per_scene) = get_collections_to_export(cls.changed_objects_per_scene, export_settings_changed, addon_prefs)
-        print("collections to export", collections_to_export)
+        #print("collections to export", collections_to_export)
         try:
             # we save this list of collections in the context
             bpy.context.window_manager.exportedCollections.clear()

tools/gltf_auto_export/helpers/serialize_scene.py

@@ -0,0 +1,146 @@
+import json
+import numpy as np
+
+import bpy
+
+
+fields_to_ignore_generic = ["tag", "type", "update_tag", "use_extra_user", "use_fake_user", "user_clear", "user_of_id", "user_remap", "users",
+                    'animation_data_clear', 'animation_data_create', 'asset_clear', 'asset_data', 'asset_generate_preview', 'asset_mark', 'bl_rna', 'evaluated_get',
+                    'library', 'library_weak_reference', 'make_local','name', 'name_full', 'original',
+                        'override_create', 'override_hierarchy_create', 'override_library', 'preview', 'preview_ensure', 'rna_type',
+                        'session_uid', 'copy', 'id_type', 'is_embedded_data', 'is_evaluated', 'is_library_indirect', 'is_missing', 'is_runtime_data']
+
+# possible alternatives https://blender.stackexchange.com/questions/286010/bpy-detect-modified-mesh-data-vertices-edges-loops-or-polygons-for-cachin
+def mesh_hash(obj):
+    # this is incomplete, how about edges ?
+    vertex_count = len(obj.data.vertices)
+    vertices_np = np.empty(vertex_count * 3, dtype=np.float32)
+    obj.data.vertices.foreach_get("co", vertices_np)
+    h = str(hash(vertices_np.tobytes()))
+    return h
+
+def animation_hash(obj):
+    animation_data = obj.animation_data
+    if not animation_data:
+        return None
+    return None
+    blender_actions = []
+    blender_tracks = {}
+
+    # TODO: this might need to be modified/ adapted to match the standard gltf exporter settings
+    for track in animation_data.nla_tracks:
+        non_muted_strips = [strip for strip in track.strips if strip.action is not None and strip.mute is False]
+        for strip in non_muted_strips: #t.strips:
+            # print("  ", source.name,'uses',strip.action.name, "active", strip.active, "action", strip.action)
+            blender_actions.append(strip.action)
+            blender_tracks[strip.action.name] = track.name
+
+    # Remove duplicate actions.
+    blender_actions = list(set(blender_actions))
+    # sort animations alphabetically (case insensitive) so they have a defined order and match Blender's Action list
+    blender_actions.sort(key = lambda a: a.name.lower())
+    
+    markers_per_animation = {}
+    animations_infos = []
+
+    for action in blender_actions:
+        animation_name = blender_tracks[action.name]
+        animations_infos.append(
+            f'(name: "{animation_name}", frame_start: {action.frame_range[0]}, frame_end: {action.frame_range[1]}, frames_length: {action.frame_range[1] - action.frame_range[0]}, frame_start_override: {action.frame_start}, frame_end_override: {action.frame_end})'
+        )
+        markers_per_animation[animation_name] = {}
+
+        for marker in action.pose_markers:
+            if marker.frame not in markers_per_animation[animation_name]:
+                markers_per_animation[animation_name][marker.frame] = []
+            markers_per_animation[animation_name][marker.frame].append(marker.name)
+
+
+def camera_hash(obj):
+    camera_fields = ["angle", "angle_x", "angle_y", "animation_data", "background_images", "clip_end", "clip_start", "display_size", "dof", "fisheye_fov"]
+    camera_data = obj.data
+    fields_to_ignore= fields_to_ignore_generic
+
+    all_field_names = dir(camera_data)
+    fields = [getattr(camera_data, prop, None) for prop in all_field_names if not prop.startswith("__") and not prop in fields_to_ignore and not prop.startswith("show_")]
+    # TODO: the above is not enough, certain fields are left as bpy.data.xx
+    #print("camera", obj, fields)
+    return str(fields)
+
+def light_hash(obj):
+    light_data = obj.data
+    fields_to_ignore = fields_to_ignore_generic
+
+    all_field_names = dir(light_data)
+    fields = [getattr(light_data, prop, None) for prop in all_field_names if not prop.startswith("__") and not prop in fields_to_ignore and not prop.startswith("show_")]
+    return str(fields)
+
+def bones_hash(bones):
+    fields_to_ignore = fields_to_ignore_generic + ['AxisRollFromMatrix', 'MatrixFromAxisRoll', 'evaluate_envelope', 'convert_local_to_pose', 'foreach_get', 'foreach_set', 'get', 'set', 'find', 'items', 'keys', 'values']
+    
+    bones_result = []
+    for bone in bones: 
+        all_field_names = dir(bone)
+        fields = [getattr(bone, prop, None)  for prop in all_field_names if not prop.startswith("__") and not prop in fields_to_ignore and not prop.startswith("show_")]
+        bones_result.append(fields)
+    print("fields of bone", bones_result)
+    return str(hash(str(bones_result)))
+
+# fixme: not good enough ?
+def armature_hash(obj):
+    fields_to_ignore = fields_to_ignore_generic + ['display_type', 'is_editmode', 'pose_position', 'foreach_get', 'get']
+    fields_to_convert = {'bones': bones_hash}#, 'collections_all': bones_hash}
+    armature_data = obj.data
+    all_field_names = dir(armature_data)
+
+    fields = [getattr(armature_data, prop, None) if not prop in fields_to_convert.keys() else fields_to_convert[prop](getattr(armature_data, prop)) for prop in all_field_names if not prop.startswith("__") and not prop in fields_to_ignore and not prop.startswith("show_")]
+    #print("ARMATURE", fields)
+
+    """for bone in armature_data.bones:
+        print("bone", bone, bone_hash(bone))"""
+    return str(fields)
+
+def serialize_scene(): 
+    print("serializing scene")
+    data = {}
+    for scene in bpy.data.scenes:
+        data[scene.name] = {}
+        for object in scene.objects:
+            #print("object", object.name, object.location)
+            transform = str((object.location, object.rotation_euler, object.scale))
+            visibility = object.visible_get()
+            
+            print("object type", object.type)
+            custom_properties = {}
+            for K in object.keys():
+                if K not in '_RNA_UI' and K != 'components_meta':
+                    #print( K , "-" , object[K] )
+                    custom_properties[K] = object[K]
+            
+            animations = animation_hash(object)
+            mesh = mesh_hash(object) if object.type == 'MESH' else None
+            camera = camera_hash(object) if object.type == 'CAMERA' else None
+            light = light_hash(object) if object.type == 'LIGHT' else None
+            armature = armature_hash(object) if object.type == 'ARMATURE' else None
+
+            data[scene.name][object.name] = {
+                "name": object.name,
+                "transforms": transform,
+                "visibility": visibility,
+                "custom_properties": custom_properties,
+                "animations": animations,
+                "mesh": mesh,
+                "camera": camera,
+                "light": light,
+                "armature": armature
+            }
+
+    """print("data", data)
+    print("")
+    print("")
+    print("data json", json.dumps(data))"""
+
+    return json.dumps(data)
+
+    #loc, rot, scale = bpy.context.object.matrix_world.decompose()
+