feat(Blenvy:Blender): overhauled & upgraded project serialization & diffing

* now also outputing seperate collections hash & materials hash from serialize_project
 * changed project_diff to do diffing of materials & collections
 * hooked up output data to export logic
 * related tweaks & improvements

tools/blenvy/TODO.md

@@ -189,7 +189,9 @@ Blender side:
 - [x] disable 'export_hierarchy_full_collections' for all cases: not reliable and redudant
 - [ ] fix systematic material exports despite no changes
 - [ ] investigate lack of detection of changes of adding/changing components
-    - [ ] change scene serialization to account for collections ...sigh
+    - [x] change scene serialization to account for collections ...sigh
+    - [x] also add one NOT PER scene for materials, to fix the above issue with materials
+    - [ ] move material caching into hash material
 - [ ] also remove ____dummy____.bin when export format is gltf
 
 - [ ] fix/cleanup asset information injection (also needed for hot reload)
@@ -269,7 +271,7 @@ Bevy Side:
     - [x] account for changes impact both parent & children (ie "world" and "blueprint3") for example, which leads to a crash as there is double despawn /respawn so we need to filter things out 
     - [x] if there are many assets/blueprints that have changed at the same time, it causes issues similar to the above, so apply a similar fix
         - [x] also ignore any entities currently spawning (better to loose some information, than cause a crash)
-    - [ ] something is off with blueprint level components
+    - [ ] analyse what is off with blueprint level components 
     - [ ] add the root blueprint itself to the assets either on the blender side or on the bevy side programatically
     - [x] for sub blueprint tracking: do not propagate/ deal with parent blueprints if they are not themselves Spawning (ie filter out by "BlueprintSpawning")
     - [ ] invalidate despawned entity & parent entities AABB 

tools/blenvy/add_ons/auto_export/blueprints/get_blueprints_to_export.py

@@ -6,7 +6,7 @@ def is_blueprint_always_export(blueprint):
     return blueprint.collection['always_export'] if 'always_export' in blueprint.collection else False
 
 # this also takes the split/embed mode into account: if a nested collection changes AND embed is active, its container collection should also be exported
-def get_blueprints_to_export(changes_per_scene, changed_export_parameters, blueprints_data, settings):
+def get_blueprints_to_export(changes_per_scene, changes_per_collection, changed_export_parameters, blueprints_data, settings):
     export_gltf_extension = getattr(settings, "export_gltf_extension", ".glb")
     blueprints_path_full = getattr(settings,"blueprints_path_full", "")
     change_detection = getattr(settings.auto_export, "change_detection")
@@ -37,8 +37,9 @@ def get_blueprints_to_export(changes_per_scene, changed_export_parameters, bluep
 
         # also deal with blueprints that are always marked as "always_export"
         blueprints_always_export = [blueprint for blueprint in internal_blueprints if is_blueprint_always_export(blueprint)]
+        changed_blueprints_based_on_changed_collections = [blueprint for blueprint in internal_blueprints if blueprint.collection in changes_per_collection.values()]
 
-        blueprints_to_export =  list(set(changed_blueprints + blueprints_not_on_disk + blueprints_always_export))
+        blueprints_to_export =  list(set(changed_blueprints + blueprints_not_on_disk + blueprints_always_export + changed_blueprints_based_on_changed_collections))
 
 
     # filter out blueprints that are not marked & deal with the different combine modes

tools/blenvy/add_ons/auto_export/common/auto_export.py

@@ -17,7 +17,7 @@ from ..levels.bevy_scene_components import remove_scene_components, upsert_scene
 
 
 """this is the main 'central' function for all auto export """
-def auto_export(changes_per_scene, changed_export_parameters, settings):
+def auto_export(changes_per_scene, changes_per_collection, changes_per_material, changed_export_parameters, settings):
     # have the export parameters (not auto export, just gltf export) have changed: if yes (for example switch from glb to gltf, compression or not, animations or not etc), we need to re-export everything
     print ("changed_export_parameters", changed_export_parameters)
     try:
@@ -63,15 +63,15 @@ def auto_export(changes_per_scene, changed_export_parameters, settings):
         if do_export_blueprints:
             print("EXPORTING")
             # get blueprints/collections infos
-            (blueprints_to_export) = get_blueprints_to_export(changes_per_scene, changed_export_parameters, blueprints_data, settings)
+            (blueprints_to_export) = get_blueprints_to_export(changes_per_scene, changes_per_collection, changed_export_parameters, blueprints_data, settings)
              
             # get level/main scenes infos
-            (main_scenes_to_export) = get_levels_to_export(changes_per_scene, changed_export_parameters, blueprints_data, settings)
+            (main_scenes_to_export) = get_levels_to_export(changes_per_scene, changes_per_collection, changed_export_parameters, blueprints_data, settings)
 
             # since materials export adds components we need to call this before blueprints are exported
             # export materials & inject materials components into relevant objects
             # FIXME: improve change detection, perhaps even add "material changes"
-            if export_materials_library and (changed_export_parameters or len(changes_per_scene.keys()) > 0 ):
+            if export_materials_library and (changed_export_parameters or len(changes_per_material.keys()) > 0 ):
                 export_materials(blueprints_data.blueprint_names, settings.library_scenes, settings)
 
             # update the list of tracked exports

tools/blenvy/add_ons/auto_export/common/prepare_and_export.py

@@ -14,16 +14,19 @@ def prepare_and_export():
     if auto_export_settings.auto_export: # only do the actual exporting if auto export is actually enabled
 
         # determine changed objects
-        per_scene_changes, project_hash = get_changes_per_scene(settings=blenvy)
+        per_scene_changes, per_collection_changes, per_material_changes, project_hash = get_changes_per_scene(settings=blenvy)
         # determine changed parameters 
         setting_changes, current_common_settings, current_export_settings, current_gltf_settings = get_setting_changes()
         print("changes: settings:", setting_changes)
         print("changes: scenes:", per_scene_changes)
+        print("changes: collections:", per_collection_changes)
+        print("changes: materials:", per_material_changes)
+
 
         print("project_hash", project_hash)
         # do the actual export
         # blenvy.auto_export.dry_run = 'NO_EXPORT'#'DISABLED'#
-        auto_export(per_scene_changes, setting_changes, blenvy)
+        auto_export(per_scene_changes, per_collection_changes, per_material_changes, setting_changes, blenvy)
 
         # -------------------------------------
         # now that this point is reached, the export should have run correctly, so we can save all the current state to the "previous one"

tools/blenvy/add_ons/auto_export/common/project_diff.py

@@ -1,6 +1,6 @@
 import json
 import bpy
-from .serialize_scene import serialize_scene
+from .serialize_project import serialize_project
 from blenvy.settings import load_settings, upsert_settings
 
 def bubble_up_changes(object, changes_per_scene):
@@ -26,7 +26,7 @@ def serialize_current(settings):
     """with bpy.context.temp_override(scene=bpy.data.scenes[1]):
         bpy.context.scene.frame_set(0)"""
     
-    current = serialize_scene(settings)
+    current = serialize_project(settings)
     bpy.context.window.scene = current_scene
 
     # reset previous frames
@@ -41,12 +41,14 @@ def get_changes_per_scene(settings):
 
     # determine changes
     changes_per_scene = {}
+    changes_per_collection = {}
+    changes_per_material = {}
     try:
-        changes_per_scene = project_diff(previous, current, settings)
+        (changes_per_scene, changes_per_collection, changes_per_material) = project_diff(previous, current, settings)
     except Exception as error:
-        print("failed to compare current serialized scenes to previous ones", error)
+        print("failed to compare current serialized scenes to previous ones: Error:", error)
 
-    return changes_per_scene, current
+    return changes_per_scene, changes_per_collection, changes_per_material, current
 
 
 def project_diff(previous, current, settings):
@@ -56,16 +58,19 @@ def project_diff(previous, current, settings):
         return {}
     
     changes_per_scene = {}
+    changes_per_collection = {}
+    changes_per_material = {}
 
     # TODO : how do we deal with changed scene names ???
     # possible ? on each save, inject an id into each scene, that cannot be copied over
+    current_scenes = current["scenes"]
+    previous_scenes = previous["scenes"]
+    for scene in current_scenes:
+        current_object_names =list(current_scenes[scene].keys())
 
-    for scene in current:
-        current_object_names =list(current[scene].keys())
+        if scene in previous_scenes: # we can only compare scenes that are in both previous and current data
 
-        if scene in previous: # we can only compare scenes that are in both previous and current data
-
-            previous_object_names = list(previous[scene].keys())
+            previous_object_names = list(previous_scenes[scene].keys())
             added =  list(set(current_object_names) - set(previous_object_names))
             removed = list(set(previous_object_names) - set(current_object_names))
             
@@ -80,10 +85,10 @@ def project_diff(previous, current, settings):
                     changes_per_scene[scene] = {}
                 changes_per_scene[scene][obj] = None
 
-            for object_name in list(current[scene].keys()): # TODO : exclude directly added/removed objects  
-                if object_name in previous[scene]:
-                    current_obj = current[scene][object_name]
-                    prev_obj = previous[scene][object_name]
+            for object_name in list(current_scenes[scene].keys()): # TODO : exclude directly added/removed objects  
+                if object_name in previous_scenes[scene]:
+                    current_obj = current_scenes[scene][object_name]
+                    prev_obj = previous_scenes[scene][object_name]
                     same = str(current_obj) == str(prev_obj)
 
                     if not same:
@@ -97,4 +102,35 @@ def project_diff(previous, current, settings):
         else:
             print(f"scene {scene} not present in previous data")
 
-    return changes_per_scene
+
+
+    current_collections = current["collections"]
+    previous_collections = previous["collections"]
+
+    for collection_name in current_collections:
+        if collection_name in previous_collections:
+            current_collection = current_collections[collection_name]
+            prev_collection = previous_collections[collection_name]
+            same = str(current_collection) == str(prev_collection)
+
+            if not same:
+                #if not collection_name in changes_per_collection:
+                target_collection = bpy.data.collections[collection_name] if collection_name in bpy.data.collections else None
+                changes_per_collection[collection_name] = target_collection
+
+    # process changes to materials
+    current_materials = current["materials"]
+    previous_materials = previous["materials"]
+
+    for material_name in current_materials:
+        if material_name in previous_materials:
+            current_material = current_materials[material_name]
+            prev_material = previous_materials[material_name]
+            same = str(current_material) == str(prev_material)
+
+            if not same:
+                #if not material_name in changes_per_material:
+                target_material = bpy.data.materials[material_name] if material_name in bpy.data.materials else None
+                changes_per_material[material_name] = target_material
+        
+    return (changes_per_scene, changes_per_collection, changes_per_material)

tools/blenvy/add_ons/auto_export/common/serialize_project.py

@@ -300,6 +300,7 @@ def materials_hash(obj, cache, settings):
 
     return str(h1_hash(str(materials)))
 
+
 def modifier_hash(modifier_data, settings):
     scan_node_tree = settings.auto_export.modifiers_in_depth_scan
     #print("HASHING MODIFIER", modifier_data.name)
@@ -316,10 +317,12 @@ def modifiers_hash(object, settings):
         #print("  ")
     return str(h1_hash(str(modifiers)))
 
-def serialize_scene(settings): 
+def serialize_project(settings): 
     cache = {"materials":{}}
     print("serializing scenes")
-    data = {}
+
+
+    per_scene = {}
 
 
     # render settings are injected into each scene
@@ -331,7 +334,7 @@ def serialize_scene(settings):
         # ignore temporary scenes
         if scene.name.startswith(TEMPSCENE_PREFIX):
             continue
-        data[scene.name] = {}
+        per_scene[scene.name] = {}
         
         custom_properties = custom_properties_hash(scene) if len(scene.keys()) > 0 else None
         eevee_settings = generic_fields_hasher_evolved(scene.eevee, fields_to_ignore=fields_to_ignore_generic) # TODO: ignore most of the fields
@@ -345,7 +348,7 @@ def serialize_scene(settings):
         #generic_fields_hasher_evolved(scene.eevee, fields_to_ignore=fields_to_ignore_generic)
         # FIXME: how to deal with this cleanly
         print("SCENE CUSTOM PROPS", custom_properties)
-        data[scene.name]["____scene_settings"] = str(h1_hash(str(scene_field_hashes)))
+        per_scene[scene.name]["____scene_settings"] = str(h1_hash(str(scene_field_hashes)))
 
 
         for object in scene.objects:
@@ -382,13 +385,42 @@ def serialize_scene(settings):
 
             object_field_hashes_filtered = {key: object_field_hashes[key] for key in object_field_hashes.keys() if object_field_hashes[key] is not None}
             objectHash = str(h1_hash(str(object_field_hashes_filtered)))
-            data[scene.name][object.name] = objectHash
+            per_scene[scene.name][object.name] = objectHash
+
+        per_collection = {}
+        # also hash collections (important to catch component changes per blueprints/collections)
+        collections_in_scene = [collection for collection in bpy.data.collections if scene.user_of_id(collection)]
+        for collection in bpy.data.collections:# collections_in_scene:
+            #loc, rot, scale = bpy.context.object.matrix_world.decompose()
+            #visibility = collection.visible_get()            
+            custom_properties = custom_properties_hash(collection) if len(collection.keys()) > 0 else None
+            # parent = collection.parent.name if collection.parent else None
+            #collections = [collection.name for collection in object.users_collection]
+
+            collection_field_hashes = {
+                "name": collection.name,
+                # "visibility": visibility,
+                "custom_properties": custom_properties,
+                #"parent": parent,
+                #"collections": collections,
+            }
+
+            collection_field_hashes_filtered = {key: collection_field_hashes[key] for key in collection_field_hashes.keys() if collection_field_hashes[key] is not None}
+            collectionHash = str(h1_hash(str(collection_field_hashes_filtered)))
+            per_collection[collection.name] = collectionHash
+
+    # and also hash materials to avoid constanstly exporting materials libraries, and only 
+    # actually this should be similar to change detections for scenes
+    per_material = {}
+    for material in bpy.data.materials:
+        per_material[material.name] = str(h1_hash(material_hash(material, settings)))
+    print("materials_hash", per_material)
 
     """print("data", data)
     print("")
     print("")
     print("data json", json.dumps(data))"""
 
-    return data # json.dumps(data)
+    return {"scenes": per_scene, "collections": per_collection, "materials": per_material}
 
 

tools/blenvy/add_ons/auto_export/levels/get_levels_to_export.py

@@ -55,7 +55,7 @@ def should_level_be_exported(scene_name, changed_export_parameters, changes_per_
     )
 
 # this also takes the split/embed mode into account: if a collection instance changes AND embed is active, its container level/world should also be exported
-def get_levels_to_export(changes_per_scene, changed_export_parameters, blueprints_data, settings):
+def get_levels_to_export(changes_per_scene, changes_per_collection, changed_export_parameters, blueprints_data, settings):
     # determine list of main scenes to export
     # we have more relaxed rules to determine if the main scenes have changed : any change is ok, (allows easier handling of changes, render settings etc)
     main_scenes_to_export = [scene_name for scene_name in settings.main_scenes_names if should_level_be_exported(scene_name, changed_export_parameters, changes_per_scene, blueprints_data, settings)]