Texture Atlas should require the user to save the blender files before we allow them to atlas

functions/atlas_materials.py

@@ -137,6 +137,10 @@ class AvatarToolKit_OT_AtlasMaterials(Operator):
 
     @classmethod
     def poll(cls, context: Context) -> bool:
+        # Only allow operation if the file is saved and materials are selected.
+        if not bpy.data.filepath:
+            cls.poll_message_set(t("TextureAtlas.save_file_first"))
+            return False
         return context.scene.avatar_toolkit.texture_atlas_Has_Mat_List_Shown
     
     def execute(self, context: Context) -> set:
@@ -208,8 +212,14 @@ class AvatarToolKit_OT_AtlasMaterials(Operator):
                                         image_pixels[int(((k*w)+i)*4)+channel]
 
                     canvas.pixels[:] = canvas_pixels[:]
-                    canvas.save(filepath=os.path.join(os.path.dirname(bpy.data.filepath),
-                                                    new_image_name+".png"))
+                    
+                    try:
+                        save_dir = os.path.dirname(bpy.data.filepath)
+                        canvas.save(filepath=os.path.join(save_dir, new_image_name+".png"))
+                    except Exception as save_error:
+                        logger.error(f"Failed to save atlas texture: {str(save_error)}")
+                        self.report({'WARNING'}, f"Could not save texture to disk. Atlas will work in memory only.")
+                    
                     setattr(atlased_mat, type_name, canvas)
                     progress.step(f"Created {type_name} atlas")
 

resources/translations/en_US.json

@@ -489,6 +489,10 @@
     "TextureAtlas.how_to_use_2": "2. Click 'Load Materials' to begin",
     "TextureAtlas.load_error": "Error loading materials. Check console for details.",
     "TextureAtlas.material_not_included": "Material is not included in atlas",
+    "TextureAtlas.save_file_first": "Please save your Blender file before creating a texture atlas",
+    "TextureAtlas.save_file_instructions": "Use File > Save As... or click the button below:",
+    "TextureAtlas.save_file_button": "Save Blender File",
+    "TextureAtlas.save_file_required": "Save File Required",
 
     "Settings.label": "Settings",
     "Settings.language": "Language",

resources/translations/ja_JP.json

@@ -489,6 +489,10 @@
     "TextureAtlas.how_to_use_2": "2. 「マテリアルを読み込む」をクリックして開始",
     "TextureAtlas.load_error": "マテリアルの読み込みエラー。詳細はコンソールを確認してください。",
     "TextureAtlas.material_not_included": "マテリアルはアトラスに含まれていません",
+    "TextureAtlas.save_file_first": "テクスチャアトラスを作成する前に、Blenderファイルを保存してください",
+    "TextureAtlas.save_file_instructions": "ファイル > 名前を付けて保存... を使用するか、下のボタンをクリックしてください：",
+    "TextureAtlas.save_file_button": "Blenderファイルを保存",
+    "TextureAtlas.save_file_required": "ファイルの保存が必要です",
 
     "Settings.label": "設定",
     "Settings.language": "言語",

resources/translations/ko_KR.json

@@ -489,6 +489,10 @@
     "TextureAtlas.how_to_use_2": "2. '재질 불러오기'를 클릭하여 시작",
     "TextureAtlas.load_error": "재질 로딩 오류. 자세한 내용은 콘솔을 확인하세요.",
     "TextureAtlas.material_not_included": "재질이 아틀라스에 포함되지 않았습니다",
+    "TextureAtlas.save_file_first": "텍스처 아틀라스를 만들기 전에 Blender 파일을 저장하세요",
+    "TextureAtlas.save_file_instructions": "파일 > 다른 이름으로 저장... 을 사용하거나 아래 버튼을 클릭하세요:",
+    "TextureAtlas.save_file_button": "Blender 파일 저장",
+    "TextureAtlas.save_file_required": "파일 저장 필요",
 
     "Settings.label": "설정",
     "Settings.language": "언어",

ui/atlas_materials_panel.py

@@ -229,6 +229,16 @@ class AvatarToolKit_PT_TextureAtlasPanel(Panel):
             info_col.label(text=t("TextureAtlas.description_1"), icon='INFO')
             info_col.label(text=t("TextureAtlas.description_2"))
             
+            if not bpy.data.filepath:
+                warning_box = layout.box()
+                warning_col = warning_box.column()
+                warning_col.scale_y = 0.9
+                warning_col.alert = True
+                warning_col.label(text=t("TextureAtlas.save_file_first"), icon='ERROR')
+                warning_col.label(text=t("TextureAtlas.save_file_instructions"))
+                warning_col.operator("wm.save_as_mainfile", text=t("TextureAtlas.save_file_button"), icon='FILE_TICK')
+                layout.separator(factor=0.5)
+            
             layout.separator(factor=0.5)
             box = layout.box()
             row = box.row(align=True)