fix(Blenvy:Blender): fixes & tweaks to materials export

* fixed missing internals
 * fixed/changed logic of finding existing material files
 * minor related fixes
 * likely last set of fixes with current materials system before switching to one material file per material

TODO.md

@@ -222,7 +222,9 @@ Blender side:
 - [ ] materials fixes & upgrades
     - [x] materials do not get exported again if the files are missing, until you change a material
     - [x] materials do not get exported when a material is added ?
+    - [ ] if material library is toggled, then changes to materials should not change the blueprints that are using them ?
     - [ ] material assets seem to be added to list regardless of whether material exports are enabled or not
+    - [ ] review & upgrade overall logic of material libraries, their names & output path
     - [ ] persist exported materials path in blueprints so that it can be read from library file users
         - [ ] just like "export_path" write it into each blueprint's collection
         - [ ] scan for used materials per blueprint !

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

@@ -12,11 +12,9 @@ def get_materials_to_export(changes_per_material, changed_export_parameters, blu
 
     all_materials = bpy.data.materials
     local_materials = [material for material in all_materials if material.library is None]
-    #and (changed_export_parameters or len(changes_per_material.keys()) > 0 )
-
     materials_to_export = []
     if change_detection and not changed_export_parameters:
-        changed_materials = []
+        changed_materials = [bpy.data.materials[material_name] for material_name in list(changes_per_material.keys())]
 
         # first check if all materials have already been exported before (if this is the first time the exporter is run
         # in your current Blender session for example)
@@ -27,5 +25,4 @@ def get_materials_to_export(changes_per_material, changed_export_parameters, blu
         materials_always_export = []
         materials_to_export =  list(set(changed_materials + materials_not_on_disk + materials_always_export))
 
-
     return materials_to_export

tools/blenvy/materials/materials_helpers.py

@@ -4,14 +4,24 @@ import bpy
 from pathlib import Path
 from ..core.helpers_collections import (traverse_tree)
 
-def find_materials_not_on_disk(materials, folder_path, extension):
+def find_materials_not_on_disk(materials, materials_path_full, extension):
     not_found_materials = []
+
+    current_project_name = Path(bpy.context.blend_data.filepath).stem
+    materials_library_name = f"{current_project_name}_materials"
+    materials_exported_path = os.path.join(materials_path_full, f"{materials_library_name}{extension}")
+
+    found = os.path.exists(materials_exported_path) and os.path.isfile(materials_exported_path)
     for material in materials:
-        gltf_output_path = os.path.join(folder_path, material.name + extension)
+        if not found:
+                not_found_materials.append(material)
+
+    """for material in materials:
+        gltf_output_path = os.path.join(materials_path_full, material.name + extension)
         # print("gltf_output_path", gltf_output_path)
         found = os.path.exists(gltf_output_path) and os.path.isfile(gltf_output_path)
         if not found:
-            not_found_materials.append(material)
+            not_found_materials.append(material)"""
     return not_found_materials
 
 def check_if_material_on_disk(scene_name, folder_path, extension):