Partial Revert: Animation Track patch cleanup

addons/io_scene_swbf_msh/__init__.py

@@ -1,7 +1,7 @@
 bl_info = {
     'name': 'SWBF .msh Import-Export',
     'author': 'Will Snyder, SleepKiller',
-    "version": (1, 0, 0),
+    "version": (1, 2, 1),
     'blender': (2, 80, 0),
     'location': 'File > Import-Export',
     'description': 'Export as SWBF .msh file',
@@ -13,9 +13,9 @@ bl_info = {
 }
 
 # Taken from glTF-Blender-IO, because I do not understand Python that well
-# (this is the first thing of substance I've created in it) and just wanted 
+# (this is the first thing of substance I've created in it) and just wanted
 # script reloading to work.
-# 
+#
 # https://github.com/KhronosGroup/glTF-Blender-IO
 #
 # Copyright 2018-2019 The glTF-Blender-IO authors.
@@ -118,8 +118,13 @@ 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, 
+                                generate_triangle_strips=self.generate_triangle_strips,
                                 apply_modifiers=self.apply_modifiers,
                                 export_target=self.export_target,
                                 skel_only=self.animation_export != 'NONE') # Exclude geometry data (except root stuff) if we're doing anims
@@ -136,7 +141,7 @@ class ExportMSH(Operator, ExportHelper):
             set_scene_animation(scene, armature_obj)
             write_scene_to_file(self.filepath, scene)
 
-        elif self.animation_export == 'BATCH':    
+        elif self.animation_export == 'BATCH':
             export_dir = self.filepath if os.path.isdir(self.filepath) else os.path.dirname(self.filepath)
 
             for action in bpy.data.actions:
@@ -157,14 +162,14 @@ def menu_func_export(self, context):
 
 
 class ImportMSH(Operator, ImportHelper):
-    """ Import an SWBF .msh file. """
+    """ Import SWBF .msh file(s). """
 
     bl_idname = "swbf_msh.import"
     bl_label = "Import SWBF .msh File(s)"
     filename_ext = ".msh"
 
     files: CollectionProperty(
-            name="File Path",
+            name="File Path(s)",
             type=bpy.types.OperatorFileListElement,
             )
 
@@ -176,7 +181,7 @@ class ImportMSH(Operator, ImportHelper):
 
     animation_only: BoolProperty(
         name="Import Animation(s)",
-        description="Import on or more animations from the selected files and append each as a new Action to currently selected Armature.",
+        description="Import one or more animations from the selected files and append each as a new Action to currently selected Armature.",
         default=False
     )
 
@@ -188,9 +193,9 @@ class ImportMSH(Operator, ImportHelper):
             if filepath.endswith(".zaabin") or filepath.endswith(".zaa"):
                 extract_and_apply_munged_anim(filepath)
             else:
-                with open(filepath, 'rb') as input_file:              
+                with open(filepath, 'rb') as input_file:
                     scene = read_scene(input_file, self.animation_only)
-                    
+
                 if not self.animation_only:
                     extract_scene(filepath, scene)
                 else:

addons/io_scene_swbf_msh/chunked_file_reader.py

@@ -138,6 +138,9 @@ class Reader:
     def how_much_left(self, pos):
         return self.end_pos - pos
 
+    def bytes_remaining(self):
+        return self.end_pos - self.file.tell()
+
     def skip_until(self, header):
         while (self.could_have_child() and header not in self.peak_next_header()):
             self.skip_bytes(1)

addons/io_scene_swbf_msh/msh_anim_to_blend.py

@@ -32,7 +32,6 @@ def extract_and_apply_anim(filename : str, scene : Scene):
 
     if scene.animation is None:
         raise Exception("No animation found in msh file!")
-    
     else:
         head, tail = os.path.split(filename)
         anim_name = tail.split(".")[0]
@@ -40,6 +39,10 @@ def extract_and_apply_anim(filename : str, scene : Scene):
         if anim_name in bpy.data.actions:
             bpy.data.actions.remove(bpy.data.actions[anim_name], do_unlink=True)
 
+            for nt in arma.animation_data.nla_tracks:
+                if anim_name == nt.strips[0].name:
+                    arma.animation_data.nla_tracks.remove(nt)
+
         action = bpy.data.actions.new(anim_name)
         action.use_fake_user = True
 
@@ -47,7 +50,7 @@ def extract_and_apply_anim(filename : str, scene : Scene):
             arma.animation_data_create()
 
 
-        # Record the starting transforms of each bone.  Pose space is relative 
+        # Record the starting transforms of each bone.  Pose space is relative
         # to bones starting transforms.  Starting = in edit mode
         bone_bind_poses = {}
 
@@ -56,7 +59,7 @@ def extract_and_apply_anim(filename : str, scene : Scene):
 
         for edit_bone in arma.data.edit_bones:
             if edit_bone.parent:
-                bone_local = edit_bone.parent.matrix.inverted() @ edit_bone.matrix 
+                bone_local = edit_bone.parent.matrix.inverted() @ edit_bone.matrix
             else:
                 bone_local = arma.matrix_local @ edit_bone.matrix
 
@@ -72,8 +75,8 @@ def extract_and_apply_anim(filename : str, scene : Scene):
 
                 translation_frames, rotation_frames = scene.animation.bone_frames[to_crc(bone.name)]
 
-                loc_data_path = "pose.bones[\"{}\"].location".format(bone.name) 
+                loc_data_path = "pose.bones[\"{}\"].location".format(bone.name)
-                rot_data_path = "pose.bones[\"{}\"].rotation_quaternion".format(bone.name) 
+                rot_data_path = "pose.bones[\"{}\"].rotation_quaternion".format(bone.name)
 
 
                 fcurve_rot_w = action.fcurves.new(rot_data_path, index=0, action_group=bone.name)
@@ -103,4 +106,5 @@ def extract_and_apply_anim(filename : str, scene : Scene):
                     fcurve_loc_z.keyframe_points.insert(i,t.z)
 
         arma.animation_data.action = action
-
+        track = arma.animation_data.nla_tracks.new()
+        track.strips.new(action.name, action.frame_range[0], action)

addons/io_scene_swbf_msh/msh_material_operators.py

@@ -47,6 +47,7 @@ class FillSWBFMaterialProperties(bpy.types.Operator):
             mat.swbf_msh_mat.doublesided = not mat.use_backface_culling
             mat.swbf_msh_mat.hardedged_transparency = (mat.blend_method == "CLIP")
             mat.swbf_msh_mat.blended_transparency = (mat.blend_method == "BLEND")
+            mat.swbf_msh_mat.additive_transparency = (mat.blend_method == "ADDITIVE")
 
 
             # Below is all for filling the diffuse map/texture_0 fields
@@ -71,6 +72,7 @@ class FillSWBFMaterialProperties(bpy.types.Operator):
                             texture_node = curr_node
                             break
                         else:
+                            # Crude but good for now
                             next_nodes = []
                             for node_input in curr_node.inputs:
                                 for link in node_input.links:
@@ -124,6 +126,7 @@ def draw_matfill_menu(self, context):
 
 # Creates shader nodes to emulate SWBF material properties.
 # Will probably only support for a narrow subset of properties...
+# So much fun to write this, will probably do all render types by end of October
 
 class GenerateMaterialNodesFromSWBFProperties(bpy.types.Operator):
     
@@ -170,7 +173,6 @@ to provide an exact emulation"""
 
             bsdf = material.node_tree.nodes.new("ShaderNodeBsdfPrincipled")
 
-
             texImage = material.node_tree.nodes.new('ShaderNodeTexImage')
             texImage.image = bpy.data.images.load(diffuse_texture_path)
             texImage.image.alpha_mode = 'CHANNEL_PACKED'
@@ -181,17 +183,30 @@ to provide an exact emulation"""
             bsdf.inputs["Roughness"].default_value = 1.0
             bsdf.inputs["Specular"].default_value = 0.0
 
-            if mat_props.hardedged_transparency and not mat_props.glow:
-                material.blend_method = "CLIP"
-                material.node_tree.links.new(bsdf.inputs['Alpha'], texImage.outputs['Alpha']) 
-
             material.use_backface_culling = not bool(mat_props.doublesided)
 
-            surface_output_nodes.append(tuple(('BSDF', bsdf)))
+            surface_output_nodes.append(('BSDF', bsdf))
 
+            if not mat_props.glow:
+                if mat_props.hardedged_transparency:
+                    material.blend_method = "CLIP"
+                    material.node_tree.links.new(bsdf.inputs['Alpha'], texImage.outputs['Alpha'])
+                elif mat_props.blended_transparency:
+                    material.blend_method = "BLEND" 
+                    material.node_tree.links.new(bsdf.inputs['Alpha'], texImage.outputs['Alpha'])
+                elif mat_props.additive_transparency:
+
+                    # most complex 
+                    transparent_bsdf = material.node_tree.nodes.new("ShaderNodeBsdfTransparent")
+                    add_shader = material.node_tree.nodes.new("ShaderNodeAddShader")
+
+                    material.node_tree.links.new(add_shader.inputs[0], bsdf.outputs["BSDF"])
+                    material.node_tree.links.new(add_shader.inputs[1], transparent_bsdf.outputs["BSDF"])
+
+                    surface_output_nodes[0] = ('Shader', add_shader)
 
             # Glow (adds another shader output)
-            if mat_props.glow:
+            else:
 
                 emission = material.node_tree.nodes.new("ShaderNodeEmission")
                 material.node_tree.links.new(emission.inputs['Color'], texImage.outputs['Color']) 
@@ -204,7 +219,7 @@ to provide an exact emulation"""
 
                 material.node_tree.links.new(emission.inputs['Strength'], emission_strength_multiplier.outputs[0])
 
-                surface_output_nodes.append(tuple(("Emission", emission)))
+                surface_output_nodes.append(("Emission", emission))
 
             surfaces_output = None
             if (len(surface_output_nodes) == 1):
@@ -261,7 +276,7 @@ to provide an exact emulation"""
 
             # Clear all anims in all cases
             if material.node_tree.animation_data:
-                material.node_tree.animation_data.action.fcurves.clear()
+                material.node_tree.animation_data_clear()
 
 
             if "SCROLL" in mat_props.rendertype:
@@ -288,7 +303,7 @@ to provide an exact emulation"""
 
             # Don't know how to set interpolation when adding keyframes
             # so we must do it after the fact
-            if material.node_tree.animation_data:
+            if material.node_tree.animation_data and material.node_tree.animation_data.action:
                 for fcurve in material.node_tree.animation_data.action.fcurves:
                     for kf in fcurve.keyframe_points.values():
                         kf.interpolation = 'LINEAR'

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

@@ -32,33 +32,62 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
     pure_bones_from_armature = {}
     armature_found = None
 
-    objects_to_export = select_objects(export_target)
+    # Non-bone objects that will be exported
+    blender_objects_to_export = []
 
-    for uneval_obj in objects_to_export:
+    # This must be seperate from the list above,
-        if uneval_obj.type == "ARMATURE":
+    # since exported objects will contain Blender objects as well as bones
+    # 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
+    # that will be exported.  This is necessary so we can prune vertex
+    # 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
+            # Get all bones in a separate list.  While we iterate through
+            # objects we removed bones with geometry from this dict.  After iteration
+            # is done, we add the remaining bones to the models from exported
+            # scene objects.
             pure_bones_from_armature = expand_armature(armature_found)
-            break
+            # All bones to set
+            exported_object_names.update(pure_bones_from_armature.keys())
+        
+        elif not (uneval_obj.type in SKIPPED_OBJECT_TYPES and uneval_obj.name not in parents):
+            exported_object_names.add(uneval_obj.name)
+            blender_objects_to_export.append(uneval_obj)
+        
+        else:
+            pass
 
-    for uneval_obj in objects_to_export:
+    for uneval_obj in blender_objects_to_export:
-        if uneval_obj.type == "ARMATURE" or (uneval_obj.type in SKIPPED_OBJECT_TYPES and uneval_obj.name not in parents):
-            continue
 
         obj = uneval_obj.evaluated_get(depsgraph) if apply_modifiers else uneval_obj
 
         check_for_bad_lod_suffix(obj)
 
-        # Test for a mesh object that is actually a BONE (shares name with bone_parent)
+        # Test for a mesh object that should be a BONE on export.
         # If so, we inject geometry into the BONE while not modifying it's transform/name
-        if obj.parent_bone and obj.parent_bone in pure_bones_from_armature:
+        # and remove it from the set of BONES without geometry (pure).
-            model = pure_bones_from_armature[obj.parent_bone]
+        if obj.name in pure_bones_from_armature:
-            # Since we found a composite bone, removed it from the dict of pure bones
+            model = pure_bones_from_armature.pop(obj.name)
-            pure_bones_from_armature.pop(obj.parent_bone)
         else:
             model = Model()
             model.name = obj.name
-            model.model_type = get_model_type(obj, skeleton_only)
+            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
 
@@ -82,10 +111,19 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
             model.transform.rotation = convert_rotation_space(local_rotation)  
             model.transform.translation = convert_vector_space(local_translation)
 
-        if obj.type in MESH_OBJECT_TYPES:
+        if obj.type in MESH_OBJECT_TYPES and not skeleton_only:
+
+            # Vertex groups are often used for purposes other than skinning.
+            # Here we gather all vgroups and select the ones that reference
+            # objects included in the export.
+            valid_vgroup_indices : Set[int] = set()
+            if model.model_type == ModelType.SKIN:
+                valid_vgroups = [group for group in obj.vertex_groups if group.name in exported_object_names]
+                valid_vgroup_indices = { group.index for group in valid_vgroups }
+                model.bone_map = [ group.name for group in valid_vgroups ]
 
             mesh = obj.to_mesh()
-            model.geometry = create_mesh_geometry(mesh, obj.vertex_groups)
+            model.geometry = create_mesh_geometry(mesh, valid_vgroup_indices)
 
             obj.to_mesh_clear()
 
@@ -98,20 +136,17 @@ def gather_models(apply_modifiers: bool, export_target: str, skeleton_only: bool
                     raise RuntimeError(f"Object '{obj.name}' has resulted in a .msh geometry segment that has "
                                        f"more than {MAX_MSH_VERTEX_COUNT} vertices! Split the object's mesh up "
                                        f"and try again!")
-            if obj.vertex_groups:
-                model.bone_map = [group.name for group in obj.vertex_groups]
-
 
         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,
     # so the bones left are all pure and we add them all here.
-    models_list += pure_bones_from_armature.values()
+    return (models_list + list(pure_bones_from_armature.values()), armature_found)
-
-    return (models_list, armature_found)
 
 
 
@@ -127,7 +162,7 @@ def create_parents_set() -> Set[str]:
 
     return parents
 
-def create_mesh_geometry(mesh: bpy.types.Mesh, has_weights: bool) -> List[GeometrySegment]:
+def create_mesh_geometry(mesh: bpy.types.Mesh, valid_vgroup_indices: Set[int]) -> List[GeometrySegment]:
     """ Creates a list of GeometrySegment objects from a Blender mesh.
         Does NOT create triangle strips in the GeometrySegment however. """
 
@@ -148,7 +183,7 @@ def create_mesh_geometry(mesh: bpy.types.Mesh, has_weights: bool) -> List[Geomet
         for segment in segments:
             segment.colors = []
 
-    if has_weights:
+    if valid_vgroup_indices:
         for segment in segments:
             segment.weights = []
 
@@ -185,8 +220,9 @@ def create_mesh_geometry(mesh: bpy.types.Mesh, has_weights: bool) -> List[Geomet
 
             if segment.weights is not None:
                 for v in mesh.vertices[vertex_index].groups:
-                    yield v.group
+                    if v.group in valid_vgroup_indices:                    
-                    yield v.weight
+                        yield v.group
+                        yield v.weight
 
         vertex_cache_entry = tuple(get_cache_vertex())
         cached_vertex_index = cache.get(vertex_cache_entry, vertex_cache_miss_index)
@@ -213,8 +249,7 @@ def create_mesh_geometry(mesh: bpy.types.Mesh, has_weights: bool) -> List[Geomet
 
         if segment.weights is not None:
             groups = mesh.vertices[vertex_index].groups
-           
+            segment.weights.append([VertexWeight(v.weight, v.group) for v in groups if v.group in valid_vgroup_indices])
-            segment.weights.append([VertexWeight(v.weight, v.group) for v in groups])
 
         return new_index
 
@@ -233,12 +268,29 @@ def create_mesh_geometry(mesh: bpy.types.Mesh, has_weights: bool) -> List[Geomet
 
     return segments
 
-def get_model_type(obj: bpy.types.Object, skel_only: bool) -> ModelType:
+def get_model_type(obj: bpy.types.Object, armature_found: bpy.types.Object) -> ModelType:
     """ Get the ModelType for a Blender object. """
 
-    if obj.type in MESH_OBJECT_TYPES and not skel_only:
+    if obj.type in MESH_OBJECT_TYPES:
-        if obj.vertex_groups:
+        # Objects can have vgroups for non-skinning purposes.
-            return ModelType.SKIN
+        # If we can find one vgroup that shares a name with a bone in the 
+        # armature, we know the vgroup is for weighting purposes and thus
+        # the object is a skin.  Otherwise, interpret it as a static mesh.
+
+        # We must also check that an armature included in the export
+        # and that it is the same one this potential skin is weighting to.
+        # If we failed to do this, a user could export a selected object
+        # that is a skin, but the weight data in the export would reference
+        # nonexistent models!
+        if (obj.vertex_groups and armature_found and 
+            obj.parent and obj.parent.name == armature_found.name):
+            
+            for vgroup in obj.vertex_groups:
+                if vgroup.name in armature_found.data.bones:
+                    return ModelType.SKIN
+
+            return ModelType.STATIC
+        
         else:
             return ModelType.STATIC
 
@@ -247,6 +299,9 @@ def get_model_type(obj: bpy.types.Object, skel_only: bool) -> ModelType:
 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_"):
@@ -311,6 +366,14 @@ def get_collision_primitive_shape(obj: bpy.types.Object) -> CollisionPrimitiveSh
     """ Gets the CollisionPrimitiveShape of an object or raises an error if
         it can't. """
 
+    # arc170 fighter has examples of box colliders without proper naming
+    # and cis_hover_aat has a cylinder which is named p_vehiclesphere.
+    # To export these properly we must check the collision_prim property
+    # that was assigned on import BEFORE looking at the name.
+    prim_type = obj.swbf_msh_coll_prim.prim_type
+    if prim_type in [item.value for item in CollisionPrimitiveShape]:
+        return CollisionPrimitiveShape(prim_type)
+
     name = obj.name.lower()
 
     if "sphere" in name or "sphr" in name or "spr" in name:
@@ -320,11 +383,6 @@ def get_collision_primitive_shape(obj: bpy.types.Object) -> CollisionPrimitiveSh
     if "box" in name or "cube" in name or "cuboid" in name:
         return CollisionPrimitiveShape.BOX
 
-    # arc170 fighter has examples of box colliders without proper naming
-    prim_type = obj.swbf_msh_coll_prim.prim_type
-    if prim_type in [item.value for item in CollisionPrimitiveShape]:
-        return CollisionPrimitiveShape(prim_type)
-
     raise RuntimeError(f"Object '{obj.name}' has no primitive type specified in it's name!")
 
 
@@ -436,6 +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_model_utilities.py

@@ -8,6 +8,25 @@ import math
 from mathutils import Vector, Matrix
 
 
+
+# Convert model with geometry to null.
+# Currently not used, but could be necessary in the future.
+def make_null(model : Model):
+    model.model_type = ModelType.NULL
+    bone_map = None
+    geometry = None
+
+
+# I think this is all we need to check for to avoid 
+# common ZE/ZETools crashes...
+def validate_geometry_segment(segment : GeometrySegment) -> bool:
+    if not segment.positions or not segment.triangle_strips:
+        return False
+    else:
+        return True
+
+
+
 def inject_dummy_data(model : Model):
     """  Adds a triangle and material to the model (scene root).  Needed to export zenasst-compatible skeletons. """
     model.hidden = True

addons/io_scene_swbf_msh/msh_scene_read.py

@@ -165,19 +165,23 @@ def _read_matd(matd: Reader) -> Material:
 
         elif next_header == "TX0D":
             with matd.read_child() as tx0d:
-                mat.texture0 = tx0d.read_string()
+                if tx0d.bytes_remaining() > 0:
+                    mat.texture0 = tx0d.read_string()
 
         elif next_header == "TX1D":
             with matd.read_child() as tx1d:
-                mat.texture1 = tx1d.read_string()
+                if tx1d.bytes_remaining() > 0:
+                    mat.texture1 = tx1d.read_string()
 
         elif next_header == "TX2D":
             with matd.read_child() as tx2d:
-                mat.texture2 = tx2d.read_string()
+                if tx2d.bytes_remaining() > 0:
+                    mat.texture2 = tx2d.read_string()
 
         elif next_header == "TX3D":
             with matd.read_child() as tx3d:
-                mat.texture3 = tx3d.read_string()
+                if tx3d.bytes_remaining() > 0:
+                    mat.texture3 = tx3d.read_string()
 
         else:
             matd.skip_bytes(1)
@@ -203,7 +207,9 @@ def _read_modl(modl: Reader, materials_list: List[Material]) -> Model:
 
                 global model_counter
                 global mndx_remap
-                mndx_remap[index] = model_counter
+
+                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(model.hidden or get_is_model_hidden(obj))
-                obj.hide_set(True)
 

addons/io_scene_swbf_msh/msh_scene_utilities.py

@@ -9,7 +9,7 @@ from mathutils import Vector
 from .msh_model import Model, Animation, ModelType
 from .msh_scene import Scene, SceneAABB
 from .msh_model_gather import gather_models
-from .msh_model_utilities import sort_by_parent, has_multiple_root_models, reparent_model_roots, get_model_world_matrix, inject_dummy_data
+from .msh_model_utilities import make_null, validate_geometry_segment, sort_by_parent, has_multiple_root_models, reparent_model_roots, get_model_world_matrix, inject_dummy_data
 from .msh_model_triangle_strips import create_models_triangle_strips
 from .msh_material import *
 from .msh_material_gather import gather_materials
@@ -53,6 +53,20 @@ def create_scene(generate_triangle_strips: bool, apply_modifiers: bool, export_t
                 for segment in model.geometry:
                     segment.triangle_strips = segment.triangles
 
+    # After generating triangle strips we must prune any segments that don't have
+    # them, or else ZE and most versions of ZETools will crash.
+
+    # We could also make models with no valid segments nulls, since they might as well be, 
+    # but that could have unforseeable consequences further down the modding pipeline
+    # and is not necessary to avoid the aforementioned crashes...
+    for model in scene.models:
+        if model.geometry is not None:
+            # Doing this in msh_model_gather would be messy and the presence/absence
+            # of triangle strips is required for a validity check.
+            model.geometry = [segment for segment in model.geometry if validate_geometry_segment(segment)]
+            #if not model.geometry:
+            #    make_null(model)
+
     if has_multiple_root_models(scene.models):
         scene.models = reparent_model_roots(scene.models)