feat(Blenvy:Blender): numerous minor tweaks & fixes (mostly materials related)

* now correctly handling multi material meshes that have more materials in their slots as there are actual
materials applied
 * per-blueprint materials are now correctly inserted/updated even when there are no material changes (ie cases where
the ordering of slots etc is changed on a mesh)
 * conditions for trigerring exports of levels & materials are more coherent and exports are now trigerred on export setting
changes (as they should have been !)
 * minor cleanups

TODO.md

@@ -226,6 +226,8 @@ Blender side:
     - [ ] materials_path custom property should be ignored both in the list of fixable component AND on export
     - [ ] if we want to add material_infos & others as normal components they should not be editable, so we need another attribute, and adapt the UI for that
 
+    - [x] injection of materials_infos should be done outside of export_materials as it should run even if materials do not need exporting
+
     - [x] if material library is toggled, then changes to materials should not change the blueprints that are using them => not really: as the name & co might change
     - [ ] material assets seem to be added to list regardless of whether material exports are enabled or not
     - [x] review & upgrade overall logic of material libraries, their names & output path

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

@@ -2,6 +2,7 @@ import os
 import bpy
 from blenvy.assets.assets_scan import get_blueprint_asset_tree
 from blenvy.assets.generate_asset_file import write_ron_assets_file
+from ....materials.materials_helpers import add_material_info_to_objects, get_blueprint_materials
 from ..constants import TEMPSCENE_PREFIX
 from ..common.generate_temporary_scene_and_export import generate_temporary_scene_and_export, copy_hollowed_collection_into, clear_hollow_scene
 from ..common.export_gltf import generate_gltf_export_settings
@@ -26,7 +27,11 @@ def export_blueprints(blueprints, settings, blueprints_data):
             if export_materials_library:
                 gltf_export_settings['export_materials'] = 'PLACEHOLDER'  
 
+            # inject blueprint asset data
             upsert_blueprint_assets(blueprint, blueprints_data=blueprints_data, settings=settings)
+            # upsert material infos if needed
+            (_, materials_per_object) = get_blueprint_materials(blueprint)
+            add_material_info_to_objects(materials_per_object, settings)
 
             # do the actual export
             generate_temporary_scene_and_export(

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

@@ -26,7 +26,7 @@ def auto_export(changes_per_scene, changes_per_collection, changes_per_material,
         #should we use change detection or not 
         change_detection = getattr(settings.auto_export, "change_detection")
         export_scene_settings = getattr(settings.auto_export, "export_scene_settings")
-        do_export_blueprints = getattr(settings.auto_export, "export_blueprints")
+        export_blueprints_enabled = getattr(settings.auto_export, "export_blueprints")
         export_materials_library = getattr(settings.auto_export, "export_materials_library")
 
         # standard gltf export settings are stored differently
@@ -62,7 +62,7 @@ def auto_export(changes_per_scene, changes_per_collection, changes_per_material,
             light['BlenderLightShadows'] = f"(enabled: {enabled}, buffer_bias: {light.shadow_buffer_bias})"
 
         # export
-        if do_export_blueprints:
+        if export_blueprints_enabled:
             print("EXPORTING")
             # get blueprints/collections infos
             (blueprints_to_export) = get_blueprints_to_export(changes_per_scene, changes_per_collection, changed_export_parameters, blueprints_data, settings)
@@ -102,20 +102,19 @@ def auto_export(changes_per_scene, changes_per_collection, changes_per_material,
             old_selections = bpy.context.selected_objects
         
             # deal with materials
-            if export_materials_library and len(materials_to_export) > 0:
+            if export_materials_library and (not change_detection or changed_export_parameters or len(materials_to_export) > 0) :
                 print("export MATERIALS")
                 export_materials(materials_to_export, settings, blueprints_data)
 
             # export any level/world scenes
-            if len(level_scenes_to_export) > 0:
+            if not change_detection or changed_export_parameters or len(level_scenes_to_export) > 0:
                 print("export LEVELS")
                 for scene_name in level_scenes_to_export:
                     print("     exporting scene:", scene_name)
                     export_level_scene(bpy.data.scenes[scene_name], settings, blueprints_data)
 
             # now deal with blueprints/collections
-            do_export_blueprints = not change_detection or changed_export_parameters or len(blueprints_to_export) > 0
+            if not change_detection or changed_export_parameters or len(blueprints_to_export) > 0:
-            if do_export_blueprints:
                 print("export BLUEPRINTS")
                 export_blueprints(blueprints_to_export, settings, blueprints_data)
 

tools/blenvy/add_ons/auto_export/materials/export_materials.py

@@ -74,13 +74,9 @@ def clear_materials_scene(temp_scene):
 # exports the materials used inside the current project:
 # the name of the output path is <materials_folder>/<name_of_your_blend_file>_materials_library.gltf/glb
 def export_materials(materials_to_export, settings, blueprints_data):
-    if len(materials_to_export) > 0:
     gltf_export_settings = generate_gltf_export_settings(settings)
     materials_path_full = getattr(settings,"materials_path_full")
 
-        (used_material_names, materials_per_object) = get_all_materials(blueprints_data.blueprint_names, settings.library_scenes)
-        add_material_info_to_objects(materials_per_object, settings)
-
     gltf_export_settings = { **gltf_export_settings, 
                     'use_active_scene': True, 
                     'use_active_collection':True, 

tools/blenvy/materials/materials_helpers.py

@@ -17,19 +17,50 @@ def check_if_material_on_disk(scene_name, folder_path, extension):
     found = os.path.exists(gltf_output_path) and os.path.isfile(gltf_output_path)
     return found
 
+
 # get materials per object, and injects the materialInfo component
 def get_materials(object, materials_per_object):
     material_slots = object.material_slots
     used_materials_names = []
    
-    for m in material_slots:
+    if not hasattr(object, "data"):
-        material = m.material
+        return used_materials_names
-        # print("    slot", m, "material", material)
+    if not hasattr(object.data,"materials"):
+        return used_materials_names
+    if len(object.data.materials) == 0:
+        return used_materials_names
+    
+    # since we are scanning polygons to get the actually used materials, we do not get them in the correct order
+    materials_per_object_unordered = []
+
+    """materials_count = len(material_slots)
+    print("materials_count", materials_count)
+    material_indices = np.empty(materials_count, dtype=np.int64)
+    object.data.polygons.foreach_get("material_index", material_indices)
+    #for material_index in object.data.polygons.foreach_get("material_index", storage):
+    print("polygon material_indices", material_indices)"""
+    # TODO: perhaps optimise it using foreach_get
+    for polygon in object.data.polygons:
+        slot = material_slots[polygon.material_index]
+        material = slot.material
+        if not material.name in used_materials_names:
             used_materials_names.append(material.name)
-        # TODO:, also respect slots & export multiple materials if applicable ! 
+            materials_per_object_unordered.append((material, polygon.material_index))
+
+        if len(used_materials_names) == len(material_slots): # we found all materials, bail out
+            break
+
+    # now re-order the materials as per the object's material slots 
+    sorted_materials = sorted(materials_per_object_unordered, key=lambda tup: tup[1])
+
+    # and add them
     if not object in materials_per_object:
         materials_per_object[object] = []
-        materials_per_object[object].append(material)
+    materials_per_object[object] = [material[0] for material in sorted_materials]#.append(material)
+
+    """for m in material_slots:
+        material = m.material"""
+
     return used_materials_names