Many msh files (e.g. those in BFX) have multiple models assigned to the same index (MNDX). Indices should be linked only to the first model that uses them to ensure proper skinning.

addons/io_scene_swbf_msh/__init__.py

@@ -118,6 +118,11 @@ class ExportMSH(Operator, ExportHelper):
 
     def execute(self, context):
 
+        if 'SELECTED' in self.export_target and len(bpy.context.selected_objects) == 0:
+            raise Exception("{} was chosen, but you have not selected any objects. "
+                            " Don't forget to unhide all the objects you wish to select!".format(self.export_target))
+
+
         scene, armature_obj = create_scene(
                                 generate_triangle_strips=self.generate_triangle_strips, 
                                 apply_modifiers=self.apply_modifiers,

addons/io_scene_swbf_msh/msh_model.py

@@ -73,7 +73,7 @@ class Model:
     name: str = "Model"
     parent: str = ""
     model_type: ModelType = ModelType.NULL
-    hidden: bool = True
+    hidden: bool = False
 
     transform: ModelTransform = field(default_factory=ModelTransform)
 

addons/io_scene_swbf_msh/msh_model_gather.py

@@ -40,6 +40,10 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
     # Here we just keep track of all names, regardless of origin
     exported_object_names: Set[str] = set() 
 
+    # Me must keep track of hidden objects separately because
+    # evaluated_get clears hidden status
+    blender_objects_to_hide: Set[str] = set()
+
     # Armature must be processed before everything else!
 
     # In this loop we also build a set of names of all objects
@@ -47,6 +51,10 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
     # groups that do not reference exported objects in the main 
     # model building loop below this one.
     for uneval_obj in select_objects(export_target):
+
+        if get_is_model_hidden(uneval_obj):
+            blender_objects_to_hide.add(uneval_obj.name)
+
         if uneval_obj.type == "ARMATURE" and not armature_found:
             # Keep track of the armature, we don't want to process > 1!
             armature_found = uneval_obj.evaluated_get(depsgraph) if apply_modifiers else uneval_obj
@@ -80,7 +88,6 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
             model = Model()
             model.name = obj.name
             model.model_type = ModelType.NULL if skeleton_only else get_model_type(obj, armature_found)
-            model.hidden = get_is_model_hidden(obj)
 
             transform = obj.matrix_local
 
@@ -133,6 +140,8 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
         if get_is_collision_primitive(obj):
             model.collisionprimitive = get_collision_primitive(obj)
 
+        model.hidden = model.name in blender_objects_to_hide
+
         models_list.append(model)
 
     # We removed all composite bones after looking through the objects,
@@ -290,6 +299,9 @@ def get_model_type(obj: bpy.types.Object, armature_found: bpy.types.Object) -> M
 def get_is_model_hidden(obj: bpy.types.Object) -> bool:
     """ Gets if a Blender object should be marked as hidden in the .msh file. """
 
+    if obj.hide_get():
+        return True
+
     name = obj.name.lower()
 
     if name.startswith("c_"):
@@ -482,6 +494,7 @@ def expand_armature(armature: bpy.types.Object) -> Dict[str, Model]:
 
         model.model_type = ModelType.BONE if bone.name in proper_BONES else ModelType.NULL
         model.name = bone.name
+        model.hidden = True
         model.transform.rotation = convert_rotation_space(local_rotation)
         model.transform.translation = convert_vector_space(local_translation)
 

addons/io_scene_swbf_msh/msh_scene_read.py

@@ -203,6 +203,8 @@ def _read_modl(modl: Reader, materials_list: List[Material]) -> Model:
 
                 global model_counter
                 global mndx_remap
+
+                if index not in mndx_remap:
                     mndx_remap[index] = model_counter
 
                 model_counter += 1

addons/io_scene_swbf_msh/msh_scene_to_blend.py

@@ -195,6 +195,5 @@ def extract_scene(filepath: str, scene: Scene):
     for model in scene.models:
         if model.name in model_map:
             obj = model_map[model.name]
-            if get_is_model_hidden(obj) and len(obj.children) == 0:
-                obj.hide_set(True)
+            obj.hide_set(model.hidden or get_is_model_hidden(obj))