fix: add error report for invalid file path when importing or exporting virtools file.

- add error report for invalid file path when importing or exporting virtools to avoid BMapException was thrown. Reported by SongRui

assets/jsons/1x1.json5

@@ -84,6 +84,7 @@
         "identifier": "floor_normal_1x1",
         "showcase": {
             "title": "Normal 1x1",
+            "category": "1x1 Blocks",
             "icon": "Normal1x1",
             "type": "floor",
             "cfgs": [
@@ -134,6 +135,7 @@
         "identifier": "floor_sink_1x1",
         "showcase": {
             "title": "Sink 1x1",
+            "category": "1x1 Blocks",
             "icon": "Sink1x1",
             "type": "floor",
             "cfgs": [

assets/jsons/borders.json5

@@ -49,6 +49,7 @@
         "identifier": "floor_normal_border",
         "showcase": {
             "title": "Normal Border",
+            "category": "Borders",
             "icon": "NormalBorder",
             "type": "floor",
             "cfgs": [
@@ -112,6 +113,7 @@
         "identifier": "floor_sink_border",
         "showcase": {
             "title": "Sink Border",
+            "category": "Borders",
             "icon": "SinkBorder",
             "type": "floor",
             "cfgs": [
@@ -175,6 +177,7 @@
         "identifier": "floor_ribbon_border",
         "showcase": {
             "title": "Ribbon Border",
+            "category": "Borders",
             "icon": "RibbonBorder",
             "type": "floor",
             "cfgs": [

assets/jsons/chris_vanilla.json5

@@ -1,4 +1,12 @@
 [
+    // One of Chris suggested more vanilla prototypes.
+    // This prototype represent a half of a normal, sink or double ribbon border,
+    // which looks like trapezoid from top to bottom.
+    // 
+    // The bottom edge of trapezoid is from origin to +X with `long_edge_length` length.
+    // The length of top edge is `short_edge_length` and it just like moving bottom edge to +Y direction.
+    // The offset between top edge and bottom edge is always 2.5.
+    // The distance from the closest point of top edge, to Y axis is `short_edge_offset`.
     {
         "identifier": "cv_trapezoid_side",
         "showcase": null,
@@ -153,6 +161,11 @@
             }
         ]
     },
+    // Same as previous one, but looks like triangle from top to bottom.
+    // 
+    // The bottom edge is from origin to +X with `edge_length` length.
+    // The tip is going to +Y.
+    // The height of this triangle is always 2.5 and the offset between tip and Y axis is `tip_offset`.
     {
         "identifier": "cv_triangle_side",
         "showcase": null,

assets/jsons/corners.json5

@@ -149,6 +149,7 @@
         "identifier": "floor_normal_inner_corner",
         "showcase": {
             "title": "Normal Inner Corner",
+            "category": "Half Block Corners",
             "icon": "NormalInnerCorner",
             "type": "floor",
             "cfgs": [
@@ -201,6 +202,7 @@
         "identifier": "floor_sink_inner_corner",
         "showcase": {
             "title": "Sink Inner Corner",
+            "category": "Half Block Corners",
             "icon": "SinkInnerCorner",
             "type": "floor",
             "cfgs": [
@@ -253,6 +255,7 @@
         "identifier": "floor_ribbon_inner_corner",
         "showcase": {
             "title": "Ribbon Inner Corner",
+            "category": "Half Block Corners",
             "icon": "RibbonInnerCorner",
             "type": "floor",
             "cfgs": [
@@ -305,6 +308,7 @@
         "identifier": "floor_normal_outter_corner",
         "showcase": {
             "title": "Normal Outter Corner",
+            "category": "Half Block Corners",
             "icon": "NormalOutterCorner",
             "type": "floor",
             "cfgs": [
@@ -357,6 +361,7 @@
         "identifier": "floor_sink_outter_corner",
         "showcase": {
             "title": "Sink Outter Corner",
+            "category": "Half Block Corners",
             "icon": "SinkOutterCorner",
             "type": "floor",
             "cfgs": [
@@ -409,6 +414,7 @@
         "identifier": "floor_ribbon_outter_corner",
         "showcase": {
             "title": "Ribbon Outter Corner",
+            "category": "Half Block Corners",
             "icon": "RibbonOutterCorner",
             "type": "floor",
             "cfgs": [

assets/jsons/crossings.json5

@@ -228,6 +228,7 @@
         "identifier": "floor_normal_l_crossing",
         "showcase": {
             "title": "Normal L Crossing",
+            "category": "Floor Crossings",
             "icon": "NormalLCrossing",
             "type": "floor",
             "cfgs": [
@@ -278,6 +279,7 @@
         "identifier": "floor_sink_l_crossing",
         "showcase": {
             "title": "Sink L Crossing",
+            "category": "Floor Crossings",
             "icon": "SinkLCrossing",
             "type": "floor",
             "cfgs": [
@@ -328,6 +330,7 @@
         "identifier": "floor_normal_t_crossing",
         "showcase": {
             "title": "Normal T Crossing",
+            "category": "Floor Crossings",
             "icon": "NormalTCrossing",
             "type": "floor",
             "cfgs": [
@@ -378,6 +381,7 @@
         "identifier": "floor_sink_t_crossing",
         "showcase": {
             "title": "Sink T Crossing",
+            "category": "Floor Crossings",
             "icon": "SinkTCrossing",
             "type": "floor",
             "cfgs": [
@@ -428,6 +432,7 @@
         "identifier": "floor_normal_x_crossing",
         "showcase": {
             "title": "Normal X Crossing",
+            "category": "Floor Crossings",
             "icon": "NormalXCrossing",
             "type": "floor",
             "cfgs": [
@@ -478,6 +483,7 @@
         "identifier": "floor_sink_x_crossing",
         "showcase": {
             "title": "Sink X Crossing",
+            "category": "Floor Crossings",
             "icon": "SinkXCrossing",
             "type": "floor",
             "cfgs": [

assets/jsons/flat.json5

@@ -3,6 +3,7 @@
         "identifier": "floor_flat",
         "showcase": {
             "title": "Flat",
+            "category": "Miscellaneous",
             "icon": "Flat",
             "type": "floor",
             "cfgs": [
@@ -36,7 +37,7 @@
                 },
                 {
                     "field": "is_sink_",
-                    "type": "float",
+                    "type": "bool",
                     "title": "Is Sink",
                     "desc": "Whether this flat floor is used for sink floor.",
                     "default": "False"

assets/jsons/platforms.json5

@@ -116,6 +116,7 @@
         "identifier": "floor_normal_platform",
         "showcase": {
             "title": "Normal Platform",
+            "category": "Platforms",
             "icon": "NormalPlatform",
             "type": "floor",
             "cfgs": [
@@ -191,6 +192,7 @@
         "identifier": "floor_sink_platform",
         "showcase": {
             "title": "Sink Platform",
+            "category": "Platforms",
             "icon": "SinkPlatform",
             "type": "floor",
             "cfgs": [
@@ -266,6 +268,7 @@
         "identifier": "floor_ribbon_platform",
         "showcase": {
             "title": "Ribbon Platform",
+            "category": "Platforms",
             "icon": "RibbonPlatform",
             "type": "floor",
             "cfgs": [

assets/jsons/streets.json5

@@ -3,6 +3,7 @@
         "identifier": "floor_normal_straight",
         "showcase": {
             "title": "Normal Floor",
+            "category": "Floors",
             "icon": "NormalFloor",
             "type": "floor",
             "cfgs": [
@@ -142,6 +143,7 @@
         "identifier": "floor_sink_straight",
         "showcase": {
             "title": "Sink Floor",
+            "category": "Floors",
             "icon": "SinkFloor",
             "type": "floor",
             "cfgs": [

assets/jsons/terminals.json5

@@ -1,4 +1,5 @@
 [
+    // The shared template prototype used by all floor terminals.
     {
         "identifier": "raw_floor_terminal",
         "showcase": null,
@@ -22,26 +23,30 @@
         "faces": [],
         "instances": [
             {
-                "identifier": "cv_triangle_side",
+                "identifier": "cv_trapezoid_side",
                 "skip": "False",
                 "params": {
-                    "edge_length": "2.5",
+                    "long_edge_length": "5.0",
-                    "tip_offset": "2.5",
+                    "short_edge_offset": "2.5",
+                    "short_edge_length": "2.5",
                     "height": "height",
-                    "face": "(face[0], False, False, face[3], face[4], None)",
+                    "face": "(face[0], False, False, face[3], face[4], False)",
-                    "is_sink": "is_sink"
+                    "is_sink": "is_sink",
+                    "is_ribbon": "False"
                 },
                 "transform": "ident()"
             },
             {
-                "identifier": "cv_triangle_side",
+                "identifier": "cv_trapezoid_side",
                 "skip": "False",
                 "params": {
-                    "edge_length": "2.5",
+                    "long_edge_length": "5.0",
-                    "tip_offset": "2.5",
+                    "short_edge_offset": "2.5",
+                    "short_edge_length": "2.5",
                     "height": "height",
-                    "face": "(face[0], False, False, face[3], face[5], None)",
+                    "face": "(face[0], False, False, face[3], face[5], False)",
-                    "is_sink": "is_sink"
+                    "is_sink": "is_sink",
+                    "is_ribbon": "False"
                 },
                 "transform": "move(0, 5, 0) @ scale(1, -1, 1)"
             },
@@ -61,7 +66,7 @@
                 "identifier": "floor_rectangle_bottom",
                 "skip": "not face[1]",
                 "params": {
-                    "length": "2.5",
+                    "length": "5",
                     "width": "5"
                 },
                 "transform": "move(0, 0, -height)"
@@ -72,6 +77,7 @@
         "identifier": "floor_normal_terminal",
         "showcase": {
             "title": "Normal Floor Terminal",
+            "category": "Floors",
             "icon": "NormalFloorTerminal",
             "type": "floor",
             "cfgs": [
@@ -122,6 +128,7 @@
         "identifier": "floor_sink_terminal",
         "showcase": {
             "title": "Sink Floor Terminal",
+            "category": "Floors",
             "icon": "SinkFloorTerminal",
             "type": "floor",
             "cfgs": [

assets/jsons/trafos.json5

@@ -137,6 +137,7 @@
         "identifier": "wood_trafo",
         "showcase": {
             "title": "Wood Trafo",
+            "category": "Trafo",
             "icon": "WoodTrafo",
             "type": "floor",
             "cfgs": [
@@ -187,6 +188,7 @@
         "identifier": "stone_trafo",
         "showcase": {
             "title": "Stone Trafo",
+            "category": "Trafo",
             "icon": "StoneTrafo",
             "type": "floor",
             "cfgs": [
@@ -237,6 +239,7 @@
         "identifier": "paper_trafo",
         "showcase": {
             "title": "Paper Trafo",
+            "category": "Trafo",
             "icon": "PaperTrafo",
             "type": "floor",
             "cfgs": [

assets/jsons/transitions.json5

@@ -111,6 +111,7 @@
         "identifier": "floor_transition",
         "showcase": {
             "title": "Transition",
+            "category": "Miscellaneous",
             "icon": "Transition",
             "type": "floor",
             "cfgs": [
@@ -191,6 +192,7 @@
         "identifier": "floor_narrow_transition",
         "showcase": {
             "title": "Narrow Transition",
+            "category": "Miscellaneous",
             "icon": "NarrowTransition",
             "type": "floor",
             "cfgs": [

assets/jsons/wide_floors.json5

@@ -3,6 +3,7 @@
         "identifier": "floor_wide_straight",
         "showcase": {
             "title": "Wide Floor",
+            "category": "Wide Floors",
             "icon": "WideFloor",
             "type": "floor",
             "cfgs": [
@@ -106,6 +107,7 @@
         "identifier": "floor_wide_terminal",
         "showcase": {
             "title": "Wide Floor Terminal",
+            "category": "Wide Floors",
             "icon": "WideFloorTerminal",
             "type": "floor",
             "cfgs": [
@@ -166,34 +168,50 @@
                 "transform": "rot(0, 0, 90) @ scale(1, -1, 1)"
             },
             {
-                "identifier": "cv_triangle_side",
+                "identifier": "cv_trapezoid_side",
                 "skip": "False",
                 "params": {
-                    "edge_length": "2.5",
+                    "long_edge_length": "5.0",
-                    "tip_offset": "2.5",
+                    "short_edge_offset": "2.5",
+                    "short_edge_length": "2.5",
                     "height": "height",
-                    "face": "(face[0], False, False, face[3], face[4], None)",
+                    "face": "(face[0], False, False, face[3], face[4], False)",
-                    "is_sink": "True"
+                    "is_sink": "True",
+                    "is_ribbon": "False"
                 },
                 "transform": "ident()"
             },
             {
-                "identifier": "cv_triangle_side",
+                "identifier": "cv_trapezoid_side",
                 "skip": "False",
                 "params": {
-                    "edge_length": "2.5",
+                    "long_edge_length": "5.0",
-                    "tip_offset": "2.5",
+                    "short_edge_offset": "2.5",
+                    "short_edge_length": "2.5",
                     "height": "height",
-                    "face": "(face[0], False, False, face[3], face[5], None)",
+                    "face": "(face[0], False, False, face[3], face[5], False)",
-                    "is_sink": "True"
+                    "is_sink": "True",
+                    "is_ribbon": "False"
                 },
                 "transform": "move(0, width + 5, 0) @ scale(1, -1, 1)"
             },
+            {
+                "identifier": "floor_flat",
+                "skip": "False",
+                "params": {
+                    "height": "height",
+                    "length": "2.5",
+                    "width": "width",
+                    "face": "(face[0], False, False, face[3], False, False)",
+                    "is_sink": "True"
+                },
+                "transform": "move(2.5, 2.5, 0)"
+            },
             {
                 "identifier": "floor_rectangle_bottom",
                 "skip": "not face[1]",
                 "params": {
-                    "length": "2.5",
+                    "length": "5",
                     "width": "5 + width"
                 },
                 "transform": "move(0, 0, -height)"
@@ -204,6 +222,7 @@
         "identifier": "floor_wide_l_crossing",
         "showcase": {
             "title": "Wide Floor L Crossing",
+            "category": "Wide Floors",
             "icon": "WideLCrossing",
             "type": "floor",
             "cfgs": [
@@ -336,6 +355,7 @@
         "identifier": "floor_wide_t_crossing",
         "showcase": {
             "title": "Wide Floor T Crossing",
+            "category": "Wide Floors",
             "icon": "WideTCrossing",
             "type": "floor",
             "cfgs": [
@@ -459,6 +479,7 @@
         "identifier": "floor_wide_x_crossing",
         "showcase": {
             "title": "Wide Floor X Crossing",
+            "category": "Wide Floors",
             "icon": "WideXCrossing",
             "type": "floor",
             "cfgs": [

bbp_ng/OP_ADDS_bme.py

@@ -250,7 +250,7 @@ class BBP_OT_add_bme_struct(bpy.types.Operator):
                 case UTIL_bme.PrototypeShowcaseCfgsTypes.Float:
                     box_layout.prop(op_cfgs_visitor[cfg_index], 'prop_float', text='')
                 case UTIL_bme.PrototypeShowcaseCfgsTypes.Boolean:
-                    box_layout.prop(op_cfgs_visitor[cfg_index], 'prop_bool', text='')
+                    box_layout.prop(op_cfgs_visitor[cfg_index], 'prop_bool', toggle=1, text='Yes', text_ctxt='BBP_OT_add_bme_struct/draw')
                 case UTIL_bme.PrototypeShowcaseCfgsTypes.Face:
                     # face will show a special layout (grid view)
                     grids = box_layout.grid_flow(
@@ -280,16 +280,24 @@ class BBP_OT_add_bme_struct(bpy.types.Operator):
 
     @classmethod
     def draw_blc_menu(cls, layout: bpy.types.UILayout):
-        for ident in _g_EnumHelper_BmeStructType.get_bme_identifiers():
+        for category, idents in _g_EnumHelper_BmeStructType.get_bme_categories().items():
-            # draw operator
+            # draw category label
-            cop = layout.operator(
+            layout.label(text=category, text_ctxt=UTIL_translation.build_prototype_showcase_category_context())
-                cls.bl_idname,
+
-                text = _g_EnumHelper_BmeStructType.get_bme_showcase_title(ident),
+            # draw prototypes list
-                icon_value = _g_EnumHelper_BmeStructType.get_bme_showcase_icon(ident),
+            for ident in idents:
-                text_ctxt = UTIL_translation.build_prototype_showcase_context(ident),
+                # draw operator
-            )
+                cop = layout.operator(
-            # and assign its init type value
+                    cls.bl_idname,
-            cop.bme_struct_type = _g_EnumHelper_BmeStructType.to_selection(ident)
+                    text = _g_EnumHelper_BmeStructType.get_bme_showcase_title(ident),
+                    icon_value = _g_EnumHelper_BmeStructType.get_bme_showcase_icon(ident),
+                    text_ctxt = UTIL_translation.build_prototype_showcase_title_context(ident),
+                )
+                # and assign its init type value
+                cop.bme_struct_type = _g_EnumHelper_BmeStructType.to_selection(ident)
+
+            # draw separator
+            layout.separator()
 
 #endregion
 

bbp_ng/OP_ADDS_rail.py

@@ -1,6 +1,6 @@
 import bpy, mathutils, math
 import typing
-from . import UTIL_rail_creator
+from . import UTIL_rail_creator, PROP_preferences
 
 ## Const Value Hint:
 #  Default Rail Radius: 0.35 (in measure)
@@ -233,6 +233,10 @@ class BBP_OT_add_rail_section(SharedRailSectionInputProperty, bpy.types.Operator
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_rail_section'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_rail_section(
@@ -254,6 +258,10 @@ class BBP_OT_add_transition_section(bpy.types.Operator):
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_transition_section'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_transition_section(bm, c_DefaultRailRadius, c_DefaultRailSpan),
@@ -272,6 +280,10 @@ class BBP_OT_add_straight_rail(SharedExtraTransform, SharedRailSectionInputPrope
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_straight_rail'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_straight_rail(
@@ -301,6 +313,10 @@ class BBP_OT_add_transition_rail(SharedExtraTransform, SharedRailCapInputPropert
     bl_options = {'REGISTER', 'UNDO'}
     bl_translation_context = 'BBP_OT_add_transition_rail'
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_transition_rail(
@@ -340,6 +356,10 @@ class BBP_OT_add_side_rail(SharedExtraTransform, SharedRailCapInputProperty, Sha
         translation_context = 'BBP_OT_add_side_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_straight_rail(
@@ -379,6 +399,10 @@ class BBP_OT_add_arc_rail(SharedExtraTransform, SharedRailSectionInputProperty,
         translation_context = 'BBP_OT_add_arc_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_screw_rail(
@@ -430,6 +454,10 @@ class BBP_OT_add_spiral_rail(SharedExtraTransform, SharedRailCapInputProperty, S
         translation_context = 'BBP_OT_add_spiral_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_screw_rail(
@@ -474,6 +502,10 @@ class BBP_OT_add_side_spiral_rail(SharedExtraTransform, SharedRailSectionInputPr
         translation_context = 'BBP_OT_add_side_spiral_rail/property'
     ) # type: ignore
 
+    @classmethod
+    def poll(cls, context):
+        return PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
+
     def execute(self, context):
         UTIL_rail_creator.rail_creator_wrapper(
             lambda bm: UTIL_rail_creator.create_screw_rail(

bbp_ng/OP_EXPORT_virtools.py

@@ -18,10 +18,16 @@ class BBP_OT_export_virtools(bpy.types.Operator, UTIL_file_browser.ExportVirtool
         return (
             PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
             and bmap.is_bmap_available())
+
+    def invoke(self, context, event):
+        # preset virtools encoding if possible
+        self.preset_vt_encodings_if_possible(context)
+        # call parent invoke function (same reason written in IMPORT module)
+        return super().invoke(context, event)
     
     def execute(self, context):
         # check selecting first
-        objls: tuple[bpy.types.Object] | None = self.general_get_export_objects(context)
+        objls: tuple[bpy.types.Object, ...] | None = self.general_get_export_objects(context)
         if objls is None:
             self.report({'ERROR'}, 'No selected target!')
             return {'CANCELLED'}
@@ -38,10 +44,16 @@ class BBP_OT_export_virtools(bpy.types.Operator, UTIL_file_browser.ExportVirtool
             self.report({'ERROR'}, 'You must specify at least one encoding for file saving (e.g. cp1252, gbk)!')
             return {'CANCELLED'}
 
+        # check file name
+        filename = self.general_get_filename()
+        if not os.path.isfile(filename):
+            self.report({'ERROR'}, 'No file was selected!')
+            return {'CANCELLED'}
+
         # start exporting
         with UTIL_ioport_shared.ExportEditModeBackup() as editmode_guard:
             _export_virtools(
-                self.general_get_filename(),
+                filename,
                 encodings,
                 texture_save_opt,
                 self.general_get_use_compress(),
@@ -68,7 +80,7 @@ _TTexturePair = tuple[bpy.types.Image, bmap.BMTexture]
 
 def _export_virtools(
         file_name_: str, 
-        encodings_: tuple[str], 
+        encodings_: tuple[str, ...], 
         texture_save_opt_: UTIL_virtools_types.CK_TEXTURE_SAVEOPTIONS,
         use_compress_: bool,
         compress_level_: int, 

bbp_ng/OP_IMPORT_virtools.py

@@ -18,6 +18,12 @@ class BBP_OT_import_virtools(bpy.types.Operator, UTIL_file_browser.ImportVirtool
         return (
             PROP_preferences.get_raw_preferences().has_valid_blc_tex_folder()
             and bmap.is_bmap_available())
+
+    def invoke(self, context, event):
+        # preset virtools encoding if possible
+        self.preset_vt_encodings_if_possible(context)
+        # call parent invoke function (do no call self "execute", because we need show a modal window)
+        return super().invoke(context, event)
     
     def execute(self, context):
         # check whether encoding list is empty to avoid real stupid user.
@@ -26,8 +32,14 @@ class BBP_OT_import_virtools(bpy.types.Operator, UTIL_file_browser.ImportVirtool
             self.report({'ERROR'}, 'You must specify at least one encoding for file loading (e.g. cp1252, gbk)!')
             return {'CANCELLED'}
 
+        # check file name
+        filename = self.general_get_filename()
+        if not os.path.isfile(filename):
+            self.report({'ERROR'}, 'No file was selected!')
+            return {'CANCELLED'}
+
         _import_virtools(
-            self.general_get_filename(),
+            filename,
             encodings,
             self.general_get_conflict_resolver()
         )
@@ -40,7 +52,7 @@ class BBP_OT_import_virtools(bpy.types.Operator, UTIL_file_browser.ImportVirtool
         self.draw_virtools_params(context, layout, True)
         self.draw_ballance_params(layout, True)
 
-def _import_virtools(file_name_: str, encodings_: tuple[str], resolver: UTIL_ioport_shared.ConflictResolver) -> None:
+def _import_virtools(file_name_: str, encodings_: tuple[str, ...], resolver: UTIL_ioport_shared.ConflictResolver) -> None:
     # create temp folder
     with tempfile.TemporaryDirectory() as vt_temp_folder:
         tr_text: str = bpy.app.translations.pgettext_rpt(

bbp_ng/OP_OBJECT_game_view.py

@@ -0,0 +1,399 @@
+import bpy, mathutils
+import typing, enum, math
+from . import UTIL_functions
+
+# TODO:
+# This file should have fully refactor after we finish Virtools Camera import and export,
+# because this module is highly rely on it. Current implementation is a compromise.
+# There is a list of things to be done:
+# - Remove BBP_OT_game_resolution operator, because Virtools Camera will have similar function in panel.
+# - Update BBP_OT_game_cameraoperator with Virtools Camera.
+
+#region Game Resolution
+
+class ResolutionKind(enum.IntEnum):
+    Normal = enum.auto()
+    Extended = enum.auto()
+    Widescreen = enum.auto()
+    Panoramic = enum.auto()
+
+    def to_resolution(self) -> tuple[int, int]:
+        match self:
+            case ResolutionKind.Normal: return (1024, 768)
+            case ResolutionKind.Extended: return (1280, 720)
+            case ResolutionKind.Widescreen: return (1400, 600)
+            case ResolutionKind.Panoramic: return (2000, 700)
+
+_g_ResolutionKindDesc: dict[ResolutionKind, tuple[str, str]] = {
+    ResolutionKind.Normal: ("Normal", "Aspect ratio: 4:3."),
+    ResolutionKind.Extended: ("Extended", "Aspect ratio: 16:9."),
+    ResolutionKind.Widescreen: ("Widescreen", "Aspect ratio: 7:3."),
+    ResolutionKind.Panoramic: ("Panoramic", "Aspect ratio: 20:7."),
+}
+_g_EnumHelper_ResolutionKind = UTIL_functions.EnumPropHelper(
+    ResolutionKind,
+    lambda x: str(x.value),
+    lambda x: ResolutionKind(int(x)),
+    lambda x: _g_ResolutionKindDesc[x][0],
+    lambda x: _g_ResolutionKindDesc[x][1],
+    lambda _: ""
+)
+
+class BBP_OT_game_resolution(bpy.types.Operator):
+    """Set Blender render resolution to Ballance game"""
+    bl_idname = "bbp.game_resolution"
+    bl_label = "Game Resolution"
+    bl_options = {'REGISTER', 'UNDO'}
+    bl_translation_context = 'BBP_OT_game_resolution'
+
+    resolution_kind: bpy.props.EnumProperty(
+        name = "Resolution Kind",
+        description = "The type of preset resolution.",
+        items = _g_EnumHelper_ResolutionKind.generate_items(),
+        default = _g_EnumHelper_ResolutionKind.to_selection(ResolutionKind.Normal)
+    ) # type: ignore
+
+    def invoke(self, context, event):
+        return self.execute(context)
+    
+    def draw(self, context):
+        layout = self.layout
+        layout.use_property_split = True
+        layout.prop(self, 'resolution_kind')
+
+    def execute(self, context):
+        # fetch resolution
+        resolution_kind = _g_EnumHelper_ResolutionKind.get_selection(self.resolution_kind)
+        resolution = resolution_kind.to_resolution()
+        # setup resolution
+        render_settings = bpy.context.scene.render
+        render_settings.resolution_x = resolution[0]
+        render_settings.resolution_y = resolution[1]
+        return {'FINISHED'}
+
+#endregion
+
+#region Game Camera
+
+#region Enum Defines
+
+class TargetKind(enum.IntEnum):
+    Cursor = enum.auto()
+    ActiveObject = enum.auto()
+_g_TargetKindDesc: dict[TargetKind, tuple[str, str, str]] = {
+    TargetKind.Cursor: ("3D Cursor", "3D cursor is player ball.", "CURSOR"),
+    TargetKind.ActiveObject: ("Active Object", "The origin point of active object is player ball.", "OBJECT_DATA"),
+}
+_g_EnumHelper_TargetKind = UTIL_functions.EnumPropHelper(
+    TargetKind,
+    lambda x: str(x.value),
+    lambda x: TargetKind(int(x)),
+    lambda x: _g_TargetKindDesc[x][0],
+    lambda x: _g_TargetKindDesc[x][1],
+    lambda x: _g_TargetKindDesc[x][2],
+)
+
+class RotationKind(enum.IntEnum):
+    Preset = enum.auto()
+    Custom = enum.auto()
+_g_RotationKindDesc: dict[RotationKind, tuple[str, str]] = {
+    RotationKind.Preset: ("Preset", "8 preset rotation angles usually used in game."),
+    RotationKind.Custom: ("Custom", "User manually input rotation angle.")
+}
+_g_EnumHelper_RotationKind = UTIL_functions.EnumPropHelper(
+    RotationKind,
+    lambda x: str(x.value),
+    lambda x: RotationKind(int(x)),
+    lambda x: _g_RotationKindDesc[x][0],
+    lambda x: _g_RotationKindDesc[x][1],
+    lambda _: ""
+)
+
+class RotationAngle(enum.IntEnum):
+    Deg0 = enum.auto()
+    Deg45 = enum.auto()
+    Deg90 = enum.auto()
+    Deg135 = enum.auto()
+    Deg180 = enum.auto()
+    Deg225 = enum.auto()
+    Deg270 = enum.auto()
+    Deg315 = enum.auto()
+
+    def to_degree(self) -> float:
+        match self:
+            case RotationAngle.Deg0: return 0
+            case RotationAngle.Deg45: return 45
+            case RotationAngle.Deg90: return 90
+            case RotationAngle.Deg135: return 135
+            case RotationAngle.Deg180: return 180
+            case RotationAngle.Deg225: return 225
+            case RotationAngle.Deg270: return 270
+            case RotationAngle.Deg315: return 315
+    
+    def to_radians(self) -> float:
+        return math.radians(self.to_degree())
+
+_g_RotationAngleDesc: dict[RotationAngle, tuple[str, str]] = {
+    # TODO: Add axis direction in description after we add Camera support when importing
+    # (because we only can confirm game camera behavior after that).
+    RotationAngle.Deg0: ("0 Degree", "0 degree"),
+    RotationAngle.Deg45: ("45 Degree", "45 degree"),
+    RotationAngle.Deg90: ("90 Degree", "90 degree"),
+    RotationAngle.Deg135: ("135 Degree", "135 degree"),
+    RotationAngle.Deg180: ("180 Degree", "180 degree"),
+    RotationAngle.Deg225: ("225 Degree", "225 degree"),
+    RotationAngle.Deg270: ("270 Degree", "270 degree"),
+    RotationAngle.Deg315: ("315 Degree", "315 degree"),
+}
+_g_EnumHelper_RotationAngle = UTIL_functions.EnumPropHelper(
+    RotationAngle,
+    lambda x: str(x.value),
+    lambda x: RotationAngle(int(x)),
+    lambda x: _g_RotationAngleDesc[x][0],
+    lambda x: _g_RotationAngleDesc[x][1],
+    lambda _: ""
+)
+
+class PerspectiveKind(enum.IntEnum):
+    Ordinary = enum.auto()
+    Lift = enum.auto()
+    EasterEgg = enum.auto()
+_g_PerspectiveKindDesc: dict[PerspectiveKind, tuple[str, str]] = {
+    PerspectiveKind.Ordinary: ("Ordinary", "The default perspective for game camera."),
+    PerspectiveKind.Lift: ("Lift", "Lifted camera in game for downcast level."),
+    PerspectiveKind.EasterEgg: ("Easter Egg", "A very close view to player ball in game."),
+}
+_g_EnumHelper_PerspectiveKind = UTIL_functions.EnumPropHelper(
+    PerspectiveKind,
+    lambda x: str(x.value),
+    lambda x: PerspectiveKind(int(x)),
+    lambda x: _g_PerspectiveKindDesc[x][0],
+    lambda x: _g_PerspectiveKindDesc[x][1],
+    lambda _: ""
+)
+
+#endregion
+
+class BBP_OT_game_camera(bpy.types.Operator):
+    """Order active camera look at target like Ballance does"""
+    bl_idname = "bbp.game_camera"
+    bl_label = "Game Camera"
+    bl_options = {'REGISTER', 'UNDO'}
+    bl_translation_context = 'BBP_OT_game_camera'
+
+    target_kind: bpy.props.EnumProperty(
+        name = "Target Kind",
+        description = "",
+        items = _g_EnumHelper_TargetKind.generate_items(),
+        default = _g_EnumHelper_TargetKind.to_selection(TargetKind.Cursor)
+    ) # type: ignore
+
+    rotation_kind: bpy.props.EnumProperty(
+        name = "Rotation Angle Kind",
+        description = "",
+        items = _g_EnumHelper_RotationKind.generate_items(),
+        default = _g_EnumHelper_RotationKind.to_selection(RotationKind.Preset)
+    ) # type: ignore
+    preset_rotation_angle: bpy.props.EnumProperty(
+        name = "Preset Rotation Angle",
+        description = "",
+        items = _g_EnumHelper_RotationAngle.generate_items(),
+        default = _g_EnumHelper_RotationAngle.to_selection(RotationAngle.Deg0)
+    ) # type: ignore
+    custom_rotation_angle: bpy.props.FloatProperty(
+        name = "Custom Rotation Angle",
+        description = "The rotation angle of camera relative to 3D Cursor",
+        subtype = 'ANGLE',
+        min = 0, max = math.radians(360),
+        step = 100,
+        # MARK: What the fuck of the precision?
+        # I set it to 2 but it doesn't work so I forcely set it to 100.
+        precision = 100,
+    ) # type: ignore
+
+    perspective_kind: bpy.props.EnumProperty(
+        name = "Rotation Angle Kind",
+        description = "",
+        items = _g_EnumHelper_PerspectiveKind.generate_items(),
+        default = _g_EnumHelper_PerspectiveKind.to_selection(PerspectiveKind.Ordinary)
+    ) # type: ignore
+
+    @classmethod
+    def poll(cls, context):
+        # find camera object
+        camera_obj = _find_camera_obj()
+        if camera_obj is None: return False
+        # find active object
+        active_obj = bpy.context.active_object
+        if active_obj is None: return False
+        # camera object should not be active object
+        return camera_obj != active_obj
+
+    def invoke(self, context, event):
+        # order user enter camera view
+        _enter_camera_view()
+        # then execute following code
+        return self.execute(context)
+    
+    def draw(self, context):
+        layout = self.layout
+
+        # Show target picker
+        layout.label(text='Target', text_ctxt='BBP_OT_game_camera/draw')
+        layout.row().prop(self, 'target_kind', expand=True)
+
+        # Show rotation angle according to different types.
+        layout.separator()
+        layout.label(text='Rotation', text_ctxt='BBP_OT_game_camera/draw')
+        layout.row().prop(self, 'rotation_kind', expand=True)
+        rot_kind = _g_EnumHelper_RotationKind.get_selection(self.rotation_kind)
+        match rot_kind:
+            case RotationKind.Preset:
+                layout.prop(self, 'preset_rotation_angle', text='')
+            case RotationKind.Custom:
+                layout.prop(self, 'custom_rotation_angle', text='')
+
+        # Show perspective kind
+        layout.separator()
+        layout.label(text='Perspective', text_ctxt='BBP_OT_game_camera/draw')
+        layout.row().prop(self, 'perspective_kind', expand=True)
+
+    def execute(self, context):
+        # fetch angle
+        angle: float
+        rot_kind = _g_EnumHelper_RotationKind.get_selection(self.rotation_kind)
+        match rot_kind:
+            case RotationKind.Preset:
+                rot_angle = _g_EnumHelper_RotationAngle.get_selection(self.preset_rotation_angle)
+                angle = rot_angle.to_radians()
+            case RotationKind.Custom:
+                angle = float(self.custom_rotation_angle)
+        # fetch others
+        camera_obj = typing.cast(bpy.types.Object, _find_camera_obj())
+        target_kind = _g_EnumHelper_TargetKind.get_selection(self.target_kind)
+        perspective_kind = _g_EnumHelper_PerspectiveKind.get_selection(self.perspective_kind)
+
+        # setup its transform and properties
+        glob_trans = _fetch_glob_translation(camera_obj, target_kind)
+        _setup_camera_transform(camera_obj, angle, perspective_kind, glob_trans)
+        _setup_camera_properties(camera_obj)
+
+        # return
+        return {'FINISHED'}
+
+def _find_3d_view_space() -> bpy.types.SpaceView3D | None:
+    # get current area
+    area = bpy.context.area
+    if area is None: return None
+
+    # check whether it is 3d view
+    if area.type != 'VIEW_3D': return None
+
+    # get the active space in area
+    space = area.spaces.active
+    if space is None: return None
+
+    # okey. cast its type and return
+    return typing.cast(bpy.types.SpaceView3D, space)
+
+def _enter_camera_view() -> None:
+    space = _find_3d_view_space()
+    if space is None: return
+
+    region = space.region_3d
+    if region is None: return
+
+    region.view_perspective = 'CAMERA'
+
+def _find_camera_obj() -> bpy.types.Object | None:
+    space = _find_3d_view_space()
+    if space is None: return None
+
+    return space.camera
+
+def _fetch_glob_translation(camobj: bpy.types.Object, target_kind: TargetKind) -> mathutils.Vector:
+    # we have checked any bad cases in "poll",
+    # so we can simply return value in there without any check.
+    match target_kind:
+        case TargetKind.Cursor:
+            return bpy.context.scene.cursor.location
+        case TargetKind.ActiveObject:
+            return bpy.context.active_object.location
+
+def _setup_camera_transform(camobj: bpy.types.Object, angle: float, perspective: PerspectiveKind, glob_trans: mathutils.Vector) -> None:
+    # decide the camera offset with ref point
+    ingamecam_pos: mathutils.Vector
+    match perspective:
+        case PerspectiveKind.Ordinary:
+            ingamecam_pos = mathutils.Vector((22, 0, 35))
+        case PerspectiveKind.Lift:
+            ingamecam_pos = mathutils.Vector((22, 0, 35 + 20))
+        case PerspectiveKind.EasterEgg:
+            ingamecam_pos = mathutils.Vector((22, 0, 3.86))
+
+    # decide the position of ref point
+    refpot_pos: mathutils.Vector
+    match perspective:
+        case PerspectiveKind.EasterEgg:
+            refpot_pos = mathutils.Vector((4.4, 0, 0))
+        case _:
+            refpot_pos = mathutils.Vector((0, 0, 0))
+
+    # perform rotation for both positions
+    player_rot_mat = mathutils.Matrix.Rotation(angle, 4, 'Z')
+    ingamecam_pos = ingamecam_pos @ player_rot_mat
+    refpot_pos = refpot_pos @ player_rot_mat
+
+    # calculate the rotation of camera
+    
+    # YYC MARK:
+    # Following code are linear algebra required.
+    # 
+    # We can calulate the direction of camera by simply substracting 2 vector.
+    # In default, the direction of camera is -Z, up direction is +Y.
+    # So this computed direction is -Z in new cooredinate system.
+    # Now we can compute +Z axis in this new coordinate system.
+    new_z = (ingamecam_pos - refpot_pos)
+    new_z.normalize()
+    # For ballance camera, all camera is +Z up.
+    # So we can use it to compute +X axis in new coordinate system
+    assistant_y = mathutils.Vector((0, 0, 1))
+    new_x = typing.cast(mathutils.Vector, assistant_y.cross(new_z))
+    new_x.normalize()
+    # now we calc the final axis
+    new_y = typing.cast(mathutils.Vector, new_z.cross(new_x))
+    new_y.normalize()
+    # okey, we conbine them as a matrix
+    rot_mat = mathutils.Matrix((
+        (new_x.x, new_y.x, new_z.x, 0),
+        (new_x.y, new_y.y, new_z.y, 0),
+        (new_x.z, new_y.z, new_z.z, 0),
+        (0, 0, 0, 1)
+    ))
+
+    # calc the final transform matrix and apply it
+    trans_mat = mathutils.Matrix.Translation(ingamecam_pos)
+    glob_trans_mat = mathutils.Matrix.Translation(glob_trans)
+    camobj.matrix_world = glob_trans_mat @ trans_mat @ rot_mat
+
+def _setup_camera_properties(camobj: bpy.types.Object) -> None:
+    # fetch camera
+    camera = typing.cast(bpy.types.Camera, camobj.data)
+
+    # set clipping
+    camera.clip_start = 4
+    camera.clip_end = 1200
+    # set FOV
+    camera.lens_unit = 'FOV'
+    camera.angle = math.radians(58)
+
+#endregion
+
+def register() -> None:
+    bpy.utils.register_class(BBP_OT_game_resolution)
+    bpy.utils.register_class(BBP_OT_game_camera)
+
+def unregister() -> None:
+    bpy.utils.unregister_class(BBP_OT_game_camera)
+    bpy.utils.unregister_class(BBP_OT_game_resolution)
+

bbp_ng/OP_OBJECT_legacy_align.py

@@ -9,11 +9,11 @@ class AlignMode(enum.IntEnum):
     BBoxCenter = enum.auto()
     AxisCenter = enum.auto()
     Max = enum.auto()
-_g_AlignModeDesc: dict[AlignMode, tuple[str, str]] = {
+_g_AlignModeDesc: dict[AlignMode, tuple[str, str, str]] = {
-    AlignMode.Min: ("Min", "The min value in specified axis."),
+    AlignMode.Min: ("Min", "The min value in specified axis.", "REMOVE"),
-    AlignMode.BBoxCenter: ("Center (Bounding Box)", "The bounding box center in specified axis."),
+    AlignMode.BBoxCenter: ("Center (Bounding Box)", "The bounding box center in specified axis.", "SHADING_BBOX"),
-    AlignMode.AxisCenter: ("Center (Axis)", "The object's source point in specified axis."),
+    AlignMode.AxisCenter: ("Center (Axis)", "The object's source point in specified axis.", "OBJECT_ORIGIN"),
-    AlignMode.Max: ("Max", "The max value in specified axis."),
+    AlignMode.Max: ("Max", "The max value in specified axis.", "ADD"),
 }
 _g_EnumHelper_AlignMode = UTIL_functions.EnumPropHelper(
     AlignMode,
@@ -21,7 +21,23 @@ _g_EnumHelper_AlignMode = UTIL_functions.EnumPropHelper(
     lambda x: AlignMode(int(x)),
     lambda x: _g_AlignModeDesc[x][0],
     lambda x: _g_AlignModeDesc[x][1],
-    lambda _: ''
+    lambda x: _g_AlignModeDesc[x][2]
+)
+
+class CurrentInstance(enum.IntEnum):
+    ActiveObject = enum.auto()
+    Cursor = enum.auto()
+_g_CurrentInstanceDesc: dict[CurrentInstance, tuple[str, str, str]] = {
+    CurrentInstance.ActiveObject: ("Active Object", "Use Active Object as Current Object", "OBJECT_DATA"),
+    CurrentInstance.Cursor: ("3D Cursor", "Use 3D Cursor as Current Object", "CURSOR"),
+}
+_g_EnumHelper_CurrentInstance = UTIL_functions.EnumPropHelper(
+    CurrentInstance,
+    lambda x: str(x.value),
+    lambda x: CurrentInstance(int(x)),
+    lambda x: _g_CurrentInstanceDesc[x][0],
+    lambda x: _g_CurrentInstanceDesc[x][1],
+    lambda x: _g_CurrentInstanceDesc[x][2]
 )
 
 #endregion
@@ -55,14 +71,23 @@ class BBP_PG_legacy_align_history(bpy.types.PropertyGroup):
         default = False,
         translation_context = 'BBP_PG_legacy_align_history/property'
     ) # type: ignore
+    current_instance: bpy.props.EnumProperty(
+        name = "Current Instance",
+        description = "Decide which instance should be used as Current Object",
+        items = _g_EnumHelper_CurrentInstance.generate_items(),
+        default = _g_EnumHelper_CurrentInstance.to_selection(CurrentInstance.ActiveObject),
+        translation_context = 'BBP_PG_legacy_align_history/property'
+    ) # type: ignore
     current_align_mode: bpy.props.EnumProperty(
-        name = "Current Object (Active Object)",
+        name = "Current Object",
+        description = "The align mode applied to Current Object",
         items = _g_EnumHelper_AlignMode.generate_items(),
         default = _g_EnumHelper_AlignMode.to_selection(AlignMode.AxisCenter),
         translation_context = 'BBP_PG_legacy_align_history/property'
     ) # type: ignore
     target_align_mode: bpy.props.EnumProperty(
-        name = "Target Objects (Selected Objects)",
+        name = "Target Objects",
+        description = "The align mode applied to Target Objects (selected objects except active object if Current Instance is active object)",
         items = _g_EnumHelper_AlignMode.generate_items(),
         default = _g_EnumHelper_AlignMode.to_selection(AlignMode.AxisCenter),
         translation_context = 'BBP_PG_legacy_align_history/property'
@@ -148,7 +173,7 @@ class BBP_OT_legacy_align(bpy.types.Operator):
     
     def execute(self, context):
         # get processed objects
-        (current_obj, target_objs) = _prepare_objects()
+        (current_obj, current_cursor, target_objs) = _prepare_objects()
         # YYC MARK:
         # This statement is VERY IMPORTANT.
         # If this statement is not presented, Blender will return identity matrix
@@ -162,7 +187,8 @@ class BBP_OT_legacy_align(bpy.types.Operator):
         histories = UTIL_functions.CollectionVisitor(self.align_history)
         for entry in histories:
             _align_objects(
-                current_obj, target_objs,
+                _g_EnumHelper_CurrentInstance.get_selection(entry.current_instance),
+                current_obj, current_cursor, target_objs,
                 entry.align_x, entry.align_y, entry.align_z,
                 _g_EnumHelper_AlignMode.get_selection(entry.current_align_mode), 
                 _g_EnumHelper_AlignMode.get_selection(entry.target_align_mode)
@@ -185,11 +211,22 @@ class BBP_OT_legacy_align(bpy.types.Operator):
         row.prop(entry, "align_y", toggle = 1)
         row.prop(entry, "align_z", toggle = 1)
 
-        # show mode
+        # show current instance
         col.separator()
-        col.label(text='Current Object (Active Object)', text_ctxt='BBP_OT_legacy_align/draw')
+        col.label(text='Current Object', text_ctxt='BBP_OT_legacy_align/draw')
-        col.prop(entry, "current_align_mode", expand = True)
+        # it should be shown in horizon so we create a new sublayout
-        col.label(text='Target Objects (Selected Objects)', text_ctxt='BBP_OT_legacy_align/draw')
+        row = col.row()
+        row.prop(entry, 'current_instance', expand=True)
+
+        # show instance and mode
+        col.separator()
+        # only show current object mode if current instance is active object,
+        # because there is no mode for 3d cursor.
+        current_instnce = _g_EnumHelper_CurrentInstance.get_selection(entry.current_instance)
+        if current_instnce == CurrentInstance.ActiveObject:
+            col.label(text='Current Object Align Mode', text_ctxt='BBP_OT_legacy_align/draw')
+            col.prop(entry, "current_align_mode", expand = True)
+        col.label(text='Target Objects Align Mode', text_ctxt='BBP_OT_legacy_align/draw')
         col.prop(entry, "target_align_mode", expand = True)
 
         # show apply button
@@ -206,44 +243,66 @@ class BBP_OT_legacy_align(bpy.types.Operator):
 #region Core Functions
 
 def _check_align_requirement() -> bool:
-    # if we are not in object mode, do not do legacy align
+    # If we are not in object mode, do not do legacy align
     if not UTIL_functions.is_in_object_mode():
         return False
     
-    # check current obj
+    # YYC MARK:
+    # We still need to check active object (as current object)
+    # although we can choose align with active object or 3d cursor.
+    # Because we can not make any promise that user will 
+    # select Active Object or 3D Cursor as current object before executing this operator.
     if bpy.context.active_object is None:
         return False
-    # check target obj with filter of current obj
+    
-    length = len(bpy.context.selected_objects)
+    # YYC MARK:
-    if bpy.context.active_object in bpy.context.selected_objects:
+    # Roughly check selected objects.
-        length -= 1
+    # We do not need exclude active object from selected objects,
-    return length != 0
+    # because active object may be moved when 3D Cursor is current object.
+    if len(bpy.context.selected_objects) == 0:
+        return False
+    
+    return True
 
-def _prepare_objects() -> tuple[bpy.types.Object, set[bpy.types.Object]]:
+def _prepare_objects() -> tuple[bpy.types.Object, mathutils.Vector, list[bpy.types.Object]]:
-    # get current object
+    # Fetch current object
-    current_obj: bpy.types.Object = bpy.context.active_object
+    current_obj = typing.cast(bpy.types.Object, bpy.context.active_object)
 
-    # get target objects
+    # Fetch 3d cursor location
-    target_objs: set[bpy.types.Object] = set(bpy.context.selected_objects)
+    current_cursor: mathutils.Vector = bpy.context.scene.cursor.location
-    # remove active one
+
-    if current_obj in target_objs:
+    # YYC MARK:
-        target_objs.remove(current_obj)
+    # Fetch target objects and do NOT remove active object from it.
+    # because active object will be moved when current instance is 3D Cursor.
+    target_objs: list[bpy.types.Object] = bpy.context.selected_objects[:]
 
     # return value
-    return (current_obj, target_objs)
+    return (current_obj, current_cursor, target_objs)
 
 def _align_objects(
-        current_obj: bpy.types.Object, target_objs: set[bpy.types.Object],
+        current_instance: CurrentInstance,
+        current_obj: bpy.types.Object, current_cursor: mathutils.Vector, target_objs: list[bpy.types.Object],
         align_x: bool, align_y: bool, align_z: bool, current_mode: AlignMode, target_mode: AlignMode) -> None:
     # if no align, skip
     if not (align_x or align_y or align_z):
         return
     
     # calc current object data
-    current_obj_ref: mathutils.Vector = _get_object_ref_point(current_obj, current_mode)
+    current_obj_ref: mathutils.Vector
+    match current_instance:
+        case CurrentInstance.ActiveObject:
+            current_obj_ref = _get_object_ref_point(current_obj, current_mode)
+        case CurrentInstance.Cursor:
+            current_obj_ref = current_cursor
 
     # process each target obj
     for target_obj in target_objs:
+        # YYC MARK:
+        # If we use active object as current instance, we need exclude it from target objects,
+        # because there is no pre-exclude considering the scenario that 3D Cursor is current instance.
+        if current_instance == CurrentInstance.ActiveObject and current_obj == target_obj:
+            continue
+
         # calc target object data
         target_obj_ref: mathutils.Vector = _get_object_ref_point(target_obj, target_mode)
         # build translation transform
@@ -256,21 +315,21 @@ def _align_objects(
         # apply translation transform to left side (add into original matrix)
         target_obj.matrix_world = target_obj_translation_matrix @ target_obj.matrix_world
 
-    bpy.context.scene.update_tag
-
 def _get_object_ref_point(obj: bpy.types.Object, mode: AlignMode) -> mathutils.Vector:
-    ref_pos: mathutils.Vector = mathutils.Vector((0, 0, 0))
+    ref_pos = mathutils.Vector((0, 0, 0))
     
     # calc bounding box data
-    corners: tuple[mathutils.Vector] = tuple(obj.matrix_world @ mathutils.Vector(corner) for corner in obj.bound_box)
+    corners: tuple[mathutils.Vector, ...] = tuple(obj.matrix_world @ mathutils.Vector(corner) for corner in obj.bound_box)
-    bbox_min_corner: mathutils.Vector = mathutils.Vector((0, 0, 0))
+    bbox_min_corner = mathutils.Vector((
-    bbox_min_corner.x = min((vec.x for vec in corners))
+        min((vec.x for vec in corners)),
-    bbox_min_corner.y = min((vec.y for vec in corners))
+        min((vec.y for vec in corners)),
-    bbox_min_corner.z = min((vec.z for vec in corners))
+        min((vec.z for vec in corners)),
-    bbox_max_corner: mathutils.Vector = mathutils.Vector((0, 0, 0))
+    ))
-    bbox_max_corner.x = max((vec.x for vec in corners))
+    bbox_max_corner = mathutils.Vector((
-    bbox_max_corner.y = max((vec.y for vec in corners))
+        max((vec.x for vec in corners)),
-    bbox_max_corner.z = max((vec.z for vec in corners))
+        max((vec.y for vec in corners)),
+        max((vec.z for vec in corners)),
+    ))
 
     # return value by given align mode
     match(mode):

bbp_ng/PROP_ptrprop_resolver.py

@@ -195,6 +195,16 @@ class PropsVisitor():
     def get_ioport_encodings(self) -> tuple[str, ...]:
         encodings = get_ioport_encodings(self.__mAssocScene)
         return tuple(i.encoding for i in encodings)
+    def preset_ioport_encodings(self) -> None:
+        """
+        Set IOPort used encodings list as preset encoding list.
+        Please note that all old values will be overwritten.
+        """
+        encodings = get_ioport_encodings(self.__mAssocScene)
+        encodings.clear()
+        for default_enc in UTIL_virtools_types.g_PyBMapDefaultEncodings:
+            item = encodings.add()
+            item.encoding = default_enc
     def draw_ioport_encodings(self, layout: bpy.types.UILayout) -> None:
         target = get_ptrprop_resolver(self.__mAssocScene)
         row = layout.row()
@@ -218,24 +228,11 @@ class PropsVisitor():
         col.separator()
         col.operator(BBP_OT_clear_ioport_encodings.bl_idname, icon='TRASH', text='')
 
-@bpy.app.handlers.persistent
-def _ioport_encodings_initializer(file_path: str):
-    # if we can fetch property, and it is empty after loading file
-    # we fill it with default value
-    encodings = get_ioport_encodings(bpy.context.scene)
-    if len(encodings) == 0:
-        for default_enc in UTIL_virtools_types.g_PyBMapDefaultEncodings:
-            item = encodings.add()
-            item.encoding = default_enc
-
 def register() -> None:
     bpy.utils.register_class(BBP_PG_bmap_encoding)
     bpy.utils.register_class(BBP_UL_bmap_encoding)
     bpy.utils.register_class(BBP_PG_ptrprop_resolver)
 
-    # register ioport encodings default value
-    bpy.app.handlers.load_post.append(_ioport_encodings_initializer)
-
     bpy.utils.register_class(BBP_OT_add_ioport_encodings)
     bpy.utils.register_class(BBP_OT_rm_ioport_encodings)
     bpy.utils.register_class(BBP_OT_up_ioport_encodings)
@@ -253,9 +250,6 @@ def unregister() -> None:
     bpy.utils.unregister_class(BBP_OT_rm_ioport_encodings)
     bpy.utils.unregister_class(BBP_OT_add_ioport_encodings)
 
-    # unregister ioport encodings default value
-    bpy.app.handlers.load_post.remove(_ioport_encodings_initializer)
-
     bpy.utils.unregister_class(BBP_PG_ptrprop_resolver)
     bpy.utils.unregister_class(BBP_UL_bmap_encoding)
     bpy.utils.unregister_class(BBP_PG_bmap_encoding)

bbp_ng/UTIL_bme.py

@@ -24,6 +24,7 @@ TOKEN_IDENTIFIER: str = 'identifier'
 
 TOKEN_SHOWCASE: str = 'showcase'
 TOKEN_SHOWCASE_TITLE: str = 'title'
+TOKEN_SHOWCASE_CATEGORY: str = 'category'
 TOKEN_SHOWCASE_ICON: str = 'icon'
 TOKEN_SHOWCASE_TYPE: str = 'type'
 TOKEN_SHOWCASE_CFGS: str = 'cfgs'
@@ -64,10 +65,10 @@ TOKEN_INSTANCES_TRANSFORM: str = 'transform'
 
 #region Prototype Loader
 
-## The list storing BME prototype.
 _g_BMEPrototypes: list[dict[str, typing.Any]] = []
-## The dict. Key is prototype identifier. value is the index of prototype in prototype list.
+"""The list storing BME prototype."""
 _g_BMEPrototypeIndexMap: dict[str, int] = {}
+"""The dict. Key is prototype identifier. Value is the index of prototype in prototype list."""
 
 # the core loader
 for walk_root, walk_dirs, walk_files in os.walk(os.path.join(os.path.dirname(__file__), 'jsons')):
@@ -99,7 +100,7 @@ def _env_fct_angle(x1: float, y1: float, x2: float, y2: float) -> float:
     # second, its direction (clockwise is positive) is opposite with blender rotation direction (counter-clockwise is positive).
     diff = mathutils.Vector((x2, y2)) - mathutils.Vector((x1, y1))
     bld_angle = math.degrees(mathutils.Vector((1,0)).angle_signed(diff, 0))
-
+    
     # flip it first
     bld_angle = -bld_angle
     # process positove number and negative number respectively
@@ -141,7 +142,7 @@ _g_ProgFieldGlobals: dict[str, typing.Any] = {
     'rot': lambda x, y, z: mathutils.Matrix.LocRotScale(None, mathutils.Euler((math.radians(x), math.radians(y), math.radians(z)), 'XYZ'), None),
     'scale': lambda x, y, z: mathutils.Matrix.LocRotScale(None, None, (x, y, z)),
     'ident': lambda: mathutils.Matrix.Identity(4),
-
+    
     # my misc custom functions
     'distance': _env_fct_distance,
     'angle': _env_fct_angle,
@@ -191,8 +192,32 @@ class EnumPropHelper(UTIL_functions.EnumPropHelper[str]):
     """
     The BME specialized Blender EnumProperty helper.
     """
+
+    showcase_identifiers: tuple[str, ...]
+    showcase_categories: dict[str, tuple[str, ...]]
     
     def __init__(self):
+        # build cache for showcase identifiers and categories
+        # prepare cache value
+        identifiers: list[str] = []
+        categories: dict[str, list[str]] = {}
+        # iterate showcase prototypes
+        for x in filter(lambda x: x[TOKEN_SHOWCASE] is not None, _g_BMEPrototypes):
+            # fetch identifier and category
+            identifier = typing.cast(str, x[TOKEN_IDENTIFIER])
+            category = typing.cast(str, x[TOKEN_SHOWCASE][TOKEN_SHOWCASE_CATEGORY])
+            # add into identifier list
+            identifiers.append(identifier)
+            # add into categories
+            categories_inner = categories.get(category, None)
+            if categories_inner is None:
+                categories_inner = []
+                categories[category] = categories_inner
+            categories_inner.append(identifier)
+        # tuple the result
+        self.showcase_identifiers = tuple(identifiers)
+        self.showcase_categories = {k: tuple(v) for k, v in categories.items()}
+
         # init parent class
         super().__init__(
             self.get_bme_identifiers(),
@@ -202,17 +227,20 @@ class EnumPropHelper(UTIL_functions.EnumPropHelper[str]):
             lambda _: '',
             lambda x: self.get_bme_showcase_icon(x)
         )
-    
+
     def get_bme_identifiers(self) -> tuple[str, ...]:
         """
         Get the identifier of prototype which need to be exposed to user.
-        Template prototype is not included.
+        In other words, template prototype is not included.
         """
-        return tuple(
+        return self.showcase_identifiers
-            x[TOKEN_IDENTIFIER] # get identifier
-            for x in filter(lambda x: x[TOKEN_SHOWCASE] is not None, _g_BMEPrototypes)  # filter() to filter no showcase template.
-        )
     
+    def get_bme_categories(self) -> dict[str, tuple[str, ...]]:
+        """
+        Get user-oriented identifier list grouped by category.
+        """
+        return self.showcase_categories
+
     def get_bme_showcase_title(self, ident: str) -> str:
         """
         Get BME display title by prototype identifier.
@@ -326,14 +354,14 @@ def create_bme_struct(
     # create mtl slot remap to help following mesh adding
     # because mesh writer do not accept string format mtl slot visiting,
     # it only accept int based mtl slot index.
-    # 
+    #
     # Also we build face used mtl slot index at the same time.
     # So we do not analyse texture field again when providing face data.
     # The result is in `prebuild_face_mtl_idx` and please note it will store all face's mtl index.
     # For example: if face 0 is skipped and face 1 is used, the first entry in `prebuild_face_mtl_idx`
     # will be the mtl slot index used by face 0, not 1. And its length is equal to the face count.
     # However, because face 0 is skipped, so the entry is not used and default set to 0.
-    # 
+    #
     # NOTE: since Python 3.6, the item of builtin dict is ordered by inserting order.
     # we rely on this to implement following features.
     mtl_remap: dict[str, int] = {}
@@ -351,7 +379,7 @@ def create_bme_struct(
             # if existing, no need to add into remap
             # but we need get its index from remap
             prebuild_face_mtl_idx[face_idx] = mtl_remap.get(mtl_name, 0)
-
+    
     # pre-compute vertices data because we may need used later.
     # Because if face normal data is null, it mean that we need to compute it
     # by given vertices.
@@ -366,7 +394,7 @@ def create_bme_struct(
         cache_bv = typing.cast(mathutils.Vector, transform @ cache_bv)
         # get result
         prebuild_vec_data.append((cache_bv.x, cache_bv.y, cache_bv.z))
-
+    
     # Check whether given transform is mirror matrix
     # because mirror matrix will reverse triangle indice order.
     # If matrix is mirror matrix, we need reverse it again in following procession,

bbp_ng/UTIL_ioport_shared.py

@@ -340,6 +340,14 @@ class VirtoolsParams():
         translation_context = 'BBP/UTIL_ioport_shared.VirtoolsParams/property'
     ) # type: ignore
 
+    def preset_vt_encodings_if_possible(self, context: bpy.types.Context):
+        """
+        Set preset value for Virtools Encoding list if there is no value inside it.
+        """
+        ptrprops = PROP_ptrprop_resolver.PropsVisitor(context.scene)
+        if len(ptrprops.get_ioport_encodings()) == 0:
+            ptrprops.preset_ioport_encodings()
+
     def draw_virtools_params(self, context: bpy.types.Context, layout: bpy.types.UILayout, is_importer: bool) -> None:
         header: bpy.types.UILayout
         body: bpy.types.UILayout
@@ -364,7 +372,6 @@ class VirtoolsParams():
             if self.use_compress:
                 body.prop(self, 'compress_level')
 
-
     def general_get_vt_encodings(self, context: bpy.types.Context) -> tuple[str, ...]:
         # get from ptrprop resolver then filter empty item
         ptrprops = PROP_ptrprop_resolver.PropsVisitor(context.scene)

bbp_ng/UTIL_translation.py

@@ -55,14 +55,22 @@ import bpy
 CTX_BBP: str = 'BBP'
 
 # The universal translation context prefix for BME module in BBP_NG plugin.
-CTX_BBP_BME: str = CTX_BBP + '/BME'
+CTX_BBP_BME: str = f'{CTX_BBP}/BME'
-def build_prototype_showcase_context(identifier: str) -> str:
+CTX_BBP_BME_CATEGORY: str = f'{CTX_BBP_BME}/Category'
+CTX_BBP_BME_PROTOTYPE: str = f'{CTX_BBP_BME}/Proto'
+def build_prototype_showcase_category_context() -> str:
+    """
+    Build the context for getting the translation for BME prototype showcase category.
+    @return The context for getting translation.
+    """
+    return CTX_BBP_BME_CATEGORY
+def build_prototype_showcase_title_context(identifier: str) -> str:
     """
     Build the context for getting the translation for BME prototype showcase title.
     @param[in] identifier The identifier of this prototype.
     @return The context for getting translation.
     """
-    return CTX_BBP_BME + '/' + identifier
+    return f'{CTX_BBP_BME_PROTOTYPE}/{identifier}'
 def build_prototype_showcase_cfg_context(identifier: str, cfg_index: int) -> str:
     """
     Build the context for getting the translation for BME prototype showcase configuration title or description.
@@ -70,7 +78,7 @@ def build_prototype_showcase_cfg_context(identifier: str, cfg_index: int) -> str
     @param[in] cfg_index The index of this configuration in this prototype showcase.
     @return The context for getting translation.
     """
-    return CTX_BBP_BME + f'/{identifier}/[{cfg_index}]'
+    return f'{CTX_BBP_BME_PROTOTYPE}/{identifier}/[{cfg_index}]'
 
 #endregion
 

bbp_ng/__init__.py

@@ -23,7 +23,7 @@ from . import OP_IMPORT_bmfile, OP_EXPORT_bmfile, OP_IMPORT_virtools, OP_EXPORT_
 from . import OP_UV_flatten_uv, OP_UV_rail_uv
 from . import OP_MTL_fix_materials
 from . import OP_ADDS_component, OP_ADDS_bme, OP_ADDS_rail
-from . import OP_OBJECT_legacy_align, OP_OBJECT_virtools_group, OP_OBJECT_snoop_group_then_to_mesh, OP_OBJECT_naming_convention
+from . import OP_OBJECT_legacy_align, OP_OBJECT_virtools_group, OP_OBJECT_snoop_group_then_to_mesh, OP_OBJECT_naming_convention, OP_OBJECT_game_view
 
 #endregion
 
@@ -170,7 +170,7 @@ class BBP_MT_View3DMenu(bpy.types.Menu):
     bl_translation_context = 'BBP_MT_View3DMenu'
 
     def draw(self, context):
-        layout = self.layout
+        layout = typing.cast(bpy.types.UILayout, self.layout)
         layout.label(text='UV', icon='UV', text_ctxt='BBP_MT_View3DMenu/draw')
         layout.operator(OP_UV_flatten_uv.BBP_OT_flatten_uv.bl_idname)
         layout.operator(OP_UV_rail_uv.BBP_OT_rail_uv.bl_idname)
@@ -178,6 +178,10 @@ class BBP_MT_View3DMenu(bpy.types.Menu):
         layout.label(text='Align', icon='SNAP_ON', text_ctxt='BBP_MT_View3DMenu/draw')
         layout.operator(OP_OBJECT_legacy_align.BBP_OT_legacy_align.bl_idname)
         layout.separator()
+        layout.label(text='Camera', icon='CAMERA_DATA', text_ctxt='BBP_MT_View3DMenu/draw')
+        layout.operator(OP_OBJECT_game_view.BBP_OT_game_resolution.bl_idname)
+        layout.operator(OP_OBJECT_game_view.BBP_OT_game_camera.bl_idname)
+        layout.separator()
         layout.label(text='Select', icon='SELECT_SET', text_ctxt='BBP_MT_View3DMenu/draw')
         layout.operator(OP_OBJECT_virtools_group.BBP_OT_select_object_by_virtools_group.bl_idname)
         layout.separator()
@@ -346,6 +350,7 @@ def register() -> None:
     OP_OBJECT_virtools_group.register()
     OP_OBJECT_snoop_group_then_to_mesh.register()
     OP_OBJECT_naming_convention.register()
+    OP_OBJECT_game_view.register()
 
     # register other classes
     for cls in g_BldClasses:
@@ -368,6 +373,7 @@ def unregister() -> None:
         bpy.utils.unregister_class(cls)
 
     # unregister modules
+    OP_OBJECT_game_view.unregister()
     OP_OBJECT_naming_convention.unregister()
     OP_OBJECT_snoop_group_then_to_mesh.unregister()
     OP_OBJECT_virtools_group.unregister()

bbp_ng/blender_manifest.toml

@@ -37,7 +37,7 @@ license = [
 # ]
 
 # Optional list of supported platforms. If omitted, the extension will be available in all operating systems.
-platforms = ["windows-x64", "linux-x64"]
+platforms = ["windows-x64", "linux-x64", "macos-arm64"]
 # Supported platforms: "windows-x64", "macos-arm64", "linux-x64", "windows-arm64", "macos-x64"
 
 # Optional: bundle 3rd party Python modules.

scripts/bme.py

@@ -27,6 +27,7 @@ class ShowcaseCfg(BaseModel):
 
 class Showcase(BaseModel):
     title: str = Field(frozen=True, strict=True)
+    category: str = Field(frozen=True, strict=True)
     icon: str = Field(frozen=True, strict=True)
     type: ShowcaseType = Field(frozen=True)
     cfgs: list[ShowcaseCfg] = Field(frozen=True, strict=True)

scripts/extract_jsons.py

@@ -9,80 +9,96 @@ import pydantic, polib, json5
 #  If the context string of translation changed, please synchronize it.
 
 CTX_TRANSLATION: str = 'BBP/BME'
+CTX_PROTOTYPE: str = f'{CTX_TRANSLATION}/Proto'
+CTX_CATEGORY: str = f'{CTX_TRANSLATION}/Category'
 
 
-def _extract_prototype(prototype: bme.Prototype) -> typing.Iterator[polib.POEntry]:
+class JsonsExtractor:
-    identifier = prototype.identifier
-    showcase = prototype.showcase
 
-    # Show message
+    po: polib.POFile
-    logging.info(f'Extracting prototype {identifier}')
+    """Extracted PO file"""
+    categories: set[str]
+    """Set for removing duplicated category names"""
 
-    # Extract showcase
+    def __init__(self) -> None:
-    if showcase is None:
+        # create po file
-        return
+        self.po = polib.POFile()
+        self.po.metadata = {
+            'Project-Id-Version': '1.0',
+            'Report-Msgid-Bugs-To': 'you@example.com',
+            'POT-Creation-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            'PO-Revision-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            'Last-Translator': 'FULL NAME <EMAIL@ADDRESS>',
+            'Language-Team': 'LANGUAGE <LL@li.org>',
+            'MIME-Version': '1.0',
+            'Content-Type': 'text/plain; charset=utf-8',
+            'Content-Transfer-Encoding': '8bit',
+            'X-Generator': 'polib',
+        }
+        # create category set
+        self.categories = set()
 
-    # Extract showcase title
+    def __extract_prototype(self, prototype: bme.Prototype) -> None:
-    yield polib.POEntry(msgid=showcase.title, msgstr='', msgctxt=f'{CTX_TRANSLATION}/{identifier}')
+        identifier = prototype.identifier
-    # Extract showcase entries
+        showcase = prototype.showcase
-    for i, cfg in enumerate(showcase.cfgs):
-        # extract title and description
-        yield polib.POEntry(msgid=cfg.title, msgstr='', msgctxt=f'{CTX_TRANSLATION}/{identifier}/[{i}]')
-        yield polib.POEntry(msgid=cfg.desc, msgstr='', msgctxt=f'{CTX_TRANSLATION}/{identifier}/[{i}]')
 
+        # Show message
+        logging.info(f'Extracting prototype {identifier}')
 
-def _extract_json(json_file: Path) -> typing.Iterator[polib.POEntry]:
+        # Extract showcase
-    # Show message
+        if showcase is None:
-    logging.info(f'Extracting file {json_file}')
+            return
 
-    try:
+        # Extract showcase title
-        # Read file and convert it into BME struct.
+        self.po.append(polib.POEntry(msgid=showcase.title, msgstr='', msgctxt=f'{CTX_PROTOTYPE}/{identifier}'))
-        with open(json_file, 'r', encoding='utf-8') as f:
+        # extract showcase category
-            document = json5.load(f)
+        if showcase.category not in self.categories:
-        prototypes = bme.Prototypes.model_validate(document)
+            self.po.append(polib.POEntry(msgid=showcase.category, msgstr='', msgctxt=CTX_CATEGORY))
-        # Extract translation
+            self.categories.add(showcase.category)
-        return itertools.chain.from_iterable(_extract_prototype(prototype) for prototype in prototypes.root)
+        # Extract showcase entries
-    except pydantic.ValidationError:
+        for i, cfg in enumerate(showcase.cfgs):
-        logging.error(f'Can not extract translation from {json_file} due to struct error. Please validate it first.')
+            # extract title and description
-    except (ValueError, UnicodeDecodeError):
+            self.po.append(polib.POEntry(msgid=cfg.title, msgstr='', msgctxt=f'{CTX_PROTOTYPE}/{identifier}/[{i}]'))
-        logging.error(f'Can not extract translation from {json_file} due to JSON5 error. Please validate it first.')
+            self.po.append(polib.POEntry(msgid=cfg.desc, msgstr='', msgctxt=f'{CTX_PROTOTYPE}/{identifier}/[{i}]'))
 
-    # Output nothing
+    def __extract_json(self, json_file: Path) -> None:
-    return itertools.chain.from_iterable(())
+        # Show message
+        logging.info(f'Extracting file {json_file}')
 
+        try:
+            # Read file and convert it into BME struct.
+            with open(json_file, 'r', encoding='utf-8') as f:
+                document = json5.load(f)
+            prototypes = bme.Prototypes.model_validate(document)
+            # Extract translation
+            for prototype in prototypes.root:
+                self.__extract_prototype(prototype)
+        except pydantic.ValidationError:
+            logging.error(
+                f'Can not extract translation from {json_file} due to struct error. Please validate it first.')
+        except (ValueError, UnicodeDecodeError):
+            logging.error(f'Can not extract translation from {json_file} due to JSON5 error. Please validate it first.')
 
-def extract_jsons() -> None:
+    def extract_jsons(self) -> None:
-    raw_jsons_dir = common.get_raw_assets_folder(AssetKind.Jsons)
+        raw_jsons_dir = common.get_raw_assets_folder(AssetKind.Jsons)
 
-    # Create POT content
+        # Iterate all prototypes and add into POT
-    po = polib.POFile()
+        for raw_json_file in raw_jsons_dir.glob('*.json5'):
-    po.metadata = {
+            # Skip non-file.
-        'Project-Id-Version': '1.0',
+            if not raw_json_file.is_file():
-        'Report-Msgid-Bugs-To': 'you@example.com',
+                continue
-        'POT-Creation-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            # Extract json
-        'PO-Revision-Date': 'YEAR-MO-DA HO:MI+ZONE',
+            self.__extract_json(raw_json_file)
-        'Last-Translator': 'FULL NAME <EMAIL@ADDRESS>',
-        'Language-Team': 'LANGUAGE <LL@li.org>',
-        'MIME-Version': '1.0',
-        'Content-Type': 'text/plain; charset=utf-8',
-        'Content-Transfer-Encoding': '8bit',
-        'X-Generator': 'polib',
-    }
 
-    # Iterate all prototypes and add into POT
+    def save(self) -> None:
-    for raw_json_file in raw_jsons_dir.glob('*.json5'):
+        """Save extracted POT file into correct path"""
-        # Skip non-file.
+        pot_file = common.get_root_folder() / 'i18n' / 'bme.pot'
-        if not raw_json_file.is_file():
+        logging.info(f'Saving POT into {pot_file}')
-            continue
+        self.po.save(str(pot_file))
-        # Extract json and append it.
-        po.extend(_extract_json(raw_json_file))
-
-    # Write into POT file
-    pot_file = common.get_root_folder() / 'i18n' / 'bme.pot'
-    logging.info(f'Saving POT into {pot_file}')
-    po.save(str(pot_file))
 
 
 if __name__ == '__main__':
     common.setup_logging()
-    extract_jsons()
+    extractor = JsonsExtractor()
+    extractor.extract_jsons()
+    extractor.save()

scripts/validate_jsons.py

@@ -48,6 +48,9 @@ def _validate_showcase(showcase: bme.Showcase, variables: set[str]) -> None:
     # The title of showcase should not be empty
     if len(showcase.title) == 0:
         logging.error('The title of showcase should not be empty.')
+    # Category words should not be empty.
+    if len(showcase.category) == 0:
+        logging.error('The category of showcase should not be empty.')
 
     # Check icon name
     _check_showcase_icon(showcase.icon)