Initial commit for import functionality

io_scene_ase/__init__.py

@@ -1,38 +0,0 @@
-if 'bpy' in locals():
-    import importlib
-    if 'ase'        in locals(): importlib.reload(ase)
-    if 'builder'    in locals(): importlib.reload(builder)
-    if 'writer'     in locals(): importlib.reload(writer)
-    if 'exporter'   in locals(): importlib.reload(exporter)
-
-import bpy
-import bpy.utils.previews
-from . import ase
-from . import builder
-from . import writer
-from . import exporter
-
-classes = exporter.classes
-
-
-def menu_func_export(self, context):
-    self.layout.operator(exporter.ASE_OT_export.bl_idname, text='ASCII Scene Export (.ase)')
-    self.layout.operator(exporter.ASE_OT_export_collections.bl_idname, text='ASCII Scene Export Collections (.ase)')
-
-
-def register():
-    for cls in classes:
-        bpy.utils.register_class(cls)
-
-    bpy.types.Scene.ase_export = bpy.props.PointerProperty(type=exporter.ASE_PG_export)
-
-    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)
-
-
-def unregister():
-    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
-
-    del bpy.types.Scene.ase_export
-
-    for cls in classes:
-        bpy.utils.unregister_class(cls)

io_scene_ase/blender_manifest.toml

@@ -1,27 +0,0 @@
-schema_version = "1.0.0"
-id = "io_scene_ase"
-version = "2.1.0"
-name = "ASCII Scene Export (.ase)"
-tagline = "Export .ase files used in Unreal Engine 1 & 2"
-maintainer = "Colin Basnett <cmbasnett@gmail.com>"
-type = "add-on"
-website = "https://github.com/DarklightGames/io_scene_ase/"
-tags = ["Game Engine", "Import-Export"]
-blender_version_min = "4.2.0"
-# Optional: maximum supported Blender version
-# blender_version_max = "5.1.0"
-license = [
-  "SPDX:GPL-3.0-or-later",
-]
-
-[build]
-paths_exclude_pattern = [
-  "/.git/",
-  "__pycache__/",
-  "/venv/",
-  "/.github/",
-  ".gitignore",
-]
-
-[permissions]
-files = "Export ASE files to disk"

io_scene_ase/exporter.py

@@ -1,200 +0,0 @@
-import os.path
-from typing import Iterable, List, Set, Union
-
-from bpy_extras.io_utils import ExportHelper
-from bpy.props import StringProperty, BoolProperty, CollectionProperty, PointerProperty, IntProperty
-from bpy.types import Operator, Material, PropertyGroup, UIList, Object
-from .builder import ASEBuilder, ASEBuilderOptions, ASEBuilderError, get_mesh_objects
-from .writer import ASEWriter
-
-
-class ASE_PG_material(PropertyGroup):
-    material: PointerProperty(type=Material)
-
-
-class ASE_PG_export(PropertyGroup):
-    material_list: CollectionProperty(name='Materials', type=ASE_PG_material)
-    material_list_index: IntProperty(name='Index', default=0)
-
-
-def get_unique_materials(mesh_objects: Iterable[Object]) -> List[Material]:
-    materials = set()
-    for mesh_object in mesh_objects:
-        for i, material_slot in enumerate(mesh_object.material_slots):
-            material = material_slot.material
-            if material is None:
-                raise RuntimeError('Material slot cannot be empty (index ' + str(i) + ')')
-            materials.add(material)
-    return list(materials)
-
-
-def populate_material_list(mesh_objects: Iterable[Object], material_list):
-    materials = get_unique_materials(mesh_objects)
-    material_list.clear()
-    for index, material in enumerate(materials):
-        m = material_list.add()
-        m.material = material
-        m.index = index
-
-
-class ASE_OT_material_list_move_up(Operator):
-    bl_idname = 'ase_export.material_list_item_move_up'
-    bl_label = 'Move Up'
-    bl_options = {'INTERNAL'}
-    bl_description = 'Move the selected material up one slot'
-
-    @classmethod
-    def poll(cls, context):
-        pg = getattr(context.scene, 'ase_export')
-        return pg.material_list_index > 0
-
-    def execute(self, context):
-        pg = getattr(context.scene, 'ase_export')
-        pg.material_list.move(pg.material_list_index, pg.material_list_index - 1)
-        pg.material_list_index -= 1
-        return {'FINISHED'}
-
-
-class ASE_OT_material_list_move_down(Operator):
-    bl_idname = 'ase_export.material_list_item_move_down'
-    bl_label = 'Move Down'
-    bl_options = {'INTERNAL'}
-    bl_description = 'Move the selected material down one slot'
-
-    @classmethod
-    def poll(cls, context):
-        pg = getattr(context.scene, 'ase_export')
-        return pg.material_list_index < len(pg.material_list) - 1
-
-    def execute(self, context):
-        pg = getattr(context.scene, 'ase_export')
-        pg.material_list.move(pg.material_list_index, pg.material_list_index + 1)
-        pg.material_list_index += 1
-        return {'FINISHED'}
-
-
-class ASE_UL_materials(UIList):
-    def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
-        row = layout.row()
-        row.prop(item.material, 'name', text='', emboss=False, icon_value=layout.icon(item.material))
-
-
-
-class ASE_OT_export(Operator, ExportHelper):
-    bl_idname = 'io_scene_ase.ase_export'
-    bl_label = 'Export ASE'
-    bl_space_type = 'PROPERTIES'
-    bl_region_type = 'WINDOW'
-    bl_description = 'Export selected objects to ASE'
-    filename_ext = '.ase'
-    filter_glob: StringProperty(default="*.ase", options={'HIDDEN'}, maxlen=255)
-    use_raw_mesh_data: BoolProperty(default=False, name='Raw Mesh Data', description='No modifiers will be evaluated as part of the exported mesh')
-
-    def draw(self, context):
-        layout = self.layout
-
-        materials_header, materials_panel = layout.panel('Materials', default_closed=False)
-        materials_header.label(text='Materials')
-
-        if materials_panel:
-            row = materials_panel.row()
-            row.template_list('ASE_UL_materials', '', context.scene.ase_export, 'material_list', context.scene.ase_export, 'material_list_index')
-            col = row.column(align=True)
-            col.operator(ASE_OT_material_list_move_up.bl_idname, icon='TRIA_UP', text='')
-            col.operator(ASE_OT_material_list_move_down.bl_idname, icon='TRIA_DOWN', text='')
-
-        advanced_header, advanced_panel = layout.panel('Advanced', default_closed=True)
-        advanced_header.label(text='Advanced')
-
-        if advanced_panel:
-            advanced_panel.prop(self, 'use_raw_mesh_data')
-
-    def invoke(self, context: 'Context', event: 'Event' ) -> Union[Set[str], Set[int]]:
-        mesh_objects = [x[0] for x in get_mesh_objects(context.selected_objects)]
-
-        pg = getattr(context.scene, 'ase_export')
-        populate_material_list(mesh_objects, pg.material_list)
-
-        context.window_manager.fileselect_add(self)
-
-        return {'RUNNING_MODAL'}
-
-    def execute(self, context):
-        options = ASEBuilderOptions()
-        options.use_raw_mesh_data = self.use_raw_mesh_data
-        pg = getattr(context.scene, 'ase_export')
-        options.materials = [x.material for x in pg.material_list]
-        try:
-            ase = ASEBuilder().build(context, options, context.selected_objects)
-            ASEWriter().write(self.filepath, ase)
-            self.report({'INFO'}, 'ASE exported successfully')
-            return {'FINISHED'}
-        except ASEBuilderError as e:
-            self.report({'ERROR'}, str(e))
-            return {'CANCELLED'}
-
-
-class ASE_OT_export_collections(Operator, ExportHelper):
-    bl_idname = 'io_scene_ase.ase_export_collections'
-    bl_label = 'Export Collections to ASE'
-    bl_space_type = 'PROPERTIES'
-    bl_region_type = 'WINDOW'
-    bl_description = 'Batch export collections to ASE. The name of the collection will be used as the filename'
-    filename_ext = '.ase'
-    filter_glob: StringProperty(
-        default="*.ase",
-        options={'HIDDEN'},
-        maxlen=255,  # Max internal buffer length, longer would be hilighted.
-    )
-    use_raw_mesh_data: BoolProperty(
-        default=False,
-        description='No modifiers will be evaluated as part of the exported mesh',
-        name='Raw Mesh Data')
-
-    def draw(self, context):
-        layout = self.layout
-        layout.prop(self, 'use_raw_mesh_data')
-
-    def execute(self, context):
-        options = ASEBuilderOptions()
-        options.use_raw_mesh_data = self.use_raw_mesh_data
-
-        # Iterate over all the visible collections in the scene.
-        layer_collections = context.view_layer.layer_collection.children
-        collections = [x.collection for x in layer_collections if not x.hide_viewport and not x.exclude]
-
-        context.window_manager.progress_begin(0, len(layer_collections))
-
-        for i, collection in enumerate(collections):
-            # Iterate over all the objects in the collection.
-            mesh_objects = get_mesh_objects(collection.all_objects)
-            # Get all the materials used by the objects in the collection.
-            options.materials = get_unique_materials([x[0] for x in mesh_objects])
-
-            try:
-                ase = ASEBuilder().build(context, options, collection.all_objects)
-                dirname = os.path.dirname(self.filepath)
-                filepath = os.path.join(dirname, collection.name + '.ase')
-                ASEWriter().write(filepath, ase)
-            except ASEBuilderError as e:
-                self.report({'ERROR'}, str(e))
-                return {'CANCELLED'}
-
-            context.window_manager.progress_update(i)
-
-        context.window_manager.progress_end()
-
-        self.report({'INFO'}, f'{len(collections)} collections exported successfully')
-
-        return {'FINISHED'}
-
-
-classes = (
-    ASE_PG_material,
-    ASE_UL_materials,
-    ASE_PG_export,
-    ASE_OT_export,
-    ASE_OT_export_collections,
-    ASE_OT_material_list_move_down,
-    ASE_OT_material_list_move_up,
-)

requirements.txt

@@ -0,0 +1 @@
+python-ase

src/__init__.py

@@ -0,0 +1,215 @@
+bl_info = {
+    'name': 'ASCII Scene Export',
+    'description': 'Export ASE (ASCII Scene Export) files',
+    'author': 'Colin Basnett (Darklight Games)',
+    'version': (1, 1, 2),
+    'blender': (2, 90, 0),
+    'location': 'File > Import-Export',
+    'warning': 'This add-on is under development.',
+    'wiki_url': 'https://github.com/DarklightGames/io_scene_ase/wiki',
+    'tracker_url': 'https://github.com/DarklightGames/io_scene_ase/issues',
+    'support': 'COMMUNITY',
+    'category': 'Import-Export'
+}
+
+import subprocess
+import os
+import sys
+from collections import namedtuple
+import bpy
+
+
+def install_pip():
+    """
+    Installs pip if not already present. Please note that ensurepip.bootstrap() also calls pip, which adds the
+    environment variable PIP_REQ_TRACKER. After ensurepip.bootstrap() finishes execution, the directory doesn't exist
+    anymore. However, when subprocess is used to call pip, in order to install a package, the environment variables
+    still contain PIP_REQ_TRACKER with the now nonexistent path. This is a problem since pip checks if PIP_REQ_TRACKER
+    is set and if it is, attempts to use it as temp directory. This would result in an error because the
+    directory can't be found. Therefore, PIP_REQ_TRACKER needs to be removed from environment variables.
+    :return:
+    """
+
+    try:
+        # Check if pip is already installed
+        subprocess.run([sys.executable, '-m', 'pip', '--version'], check=True)
+    except subprocess.CalledProcessError:
+        import ensurepip
+
+        ensurepip.bootstrap()
+        os.environ.pop('PIP_REQ_TRACKER', None)
+
+
+def install_and_import_module(module_name, package_name=None, global_name=None):
+    """
+    Installs the package through pip and attempts to import the installed module.
+    :param module_name: Module to import.
+    :param package_name: (Optional) Name of the package that needs to be installed. If None it is assumed to be equal
+       to the module_name.
+    :param global_name: (Optional) Name under which the module is imported. If None the module_name will be used.
+       This allows to import under a different name with the same effect as e.g. "import numpy as np" where "np" is
+       the global_name under which the module can be accessed.
+    :raises: subprocess.CalledProcessError and ImportError
+    """
+    if package_name is None:
+        package_name = module_name
+
+    if global_name is None:
+        global_name = module_name
+
+    # Blender disables the loading of user site-packages by default. However, pip will still check them to determine
+    # if a dependency is already installed. This can cause problems if the packages is installed in the user
+    # site-packages and pip deems the requirement satisfied, but Blender cannot import the package from the user
+    # site-packages. Hence, the environment variable PYTHONNOUSERSITE is set to disallow pip from checking the user
+    # site-packages. If the package is not already installed for Blender's Python interpreter, it will then try to.
+    # The paths used by pip can be checked with `subprocess.run([bpy.app.binary_path_python, "-m", "site"], check=True)`
+
+    # Create a copy of the environment variables and modify them for the subprocess call
+    environ_copy = dict(os.environ)
+    environ_copy['PYTHONNOUSERSITE'] = '1'
+
+    subprocess.run([sys.executable, '-m', 'pip', 'install', package_name], check=True, env=environ_copy)
+
+    # The installation succeeded, attempt to import the module again
+    import_module(module_name, global_name)
+
+
+class EXAMPLE_OT_install_dependencies(bpy.types.Operator):
+    bl_idname = 'io_scene_ase.install_dependencies'
+    bl_label = 'Install dependencies'
+    bl_description = ('Downloads and installs the required python packages for this add-on. '
+                      'Internet connection is required. Blender may have to be started with '
+                      'elevated permissions in order to install the package')
+    bl_options = {'REGISTER', 'INTERNAL'}
+
+    @classmethod
+    def poll(self, context):
+        # Deactivate when dependencies have been installed
+        return not dependencies_installed
+
+    def execute(self, context):
+        try:
+            install_pip()
+            for dependency in dependencies:
+                install_and_import_module(module_name=dependency.module,
+                                          package_name=dependency.package,
+                                          global_name=dependency.name)
+        except (subprocess.CalledProcessError, ImportError) as err:
+            self.report({'ERROR'}, str(err))
+            return {'CANCELLED'}
+
+        global dependencies_installed
+        dependencies_installed = True
+
+        # Register the panels, operators, etc. since dependencies are installed
+        for cls in classes:
+            bpy.utils.register_class(cls)
+
+        return {'FINISHED'}
+
+
+class EXAMPLE_preferences(bpy.types.AddonPreferences):
+    bl_idname = __name__
+
+    def draw(self, context):
+        layout = self.layout
+        layout.operator(EXAMPLE_OT_install_dependencies.bl_idname, icon='CONSOLE')
+
+
+Dependency = namedtuple('Dependency', ['module', 'package', 'name'])
+
+dependencies = (Dependency(module='asepy', package=None, name=None),)
+
+dependencies_installed = False
+
+
+def import_module(module_name, global_name=None, reload=True):
+    """
+    Import a module.
+    :param module_name: Module to import.
+    :param global_name: (Optional) Name under which the module is imported. If None the module_name will be used.
+       This allows to import under a different name with the same effect as e.g. "import numpy as np" where "np" is
+       the global_name under which the module can be accessed.
+    :raises: ImportError and ModuleNotFoundError
+    """
+    if global_name is None:
+        global_name = module_name
+
+    if global_name in globals():
+        importlib.reload(globals()[global_name])
+    else:
+        # Attempt to import the module and assign it to globals dictionary. This allow to access the module under
+        # the given name, just like the regular import would.
+        globals()[global_name] = importlib.import_module(module_name)
+
+
+preference_classes = (EXAMPLE_OT_install_dependencies,
+                      EXAMPLE_preferences)
+
+if __name__ == 'io_scene_ase':
+    if 'bpy' in locals():
+        import importlib
+        if 'ase'        in locals(): importlib.reload(ase)
+        if 'builder'    in locals(): importlib.reload(builder)
+        if 'writer'     in locals(): importlib.reload(writer)
+        if 'exporter'   in locals(): importlib.reload(exporter)
+        if 'reader'     in locals(): importlib.reload(reader)
+
+    import bpy
+    import bpy.utils.previews
+    from . import ase
+    from . import builder
+    from . import writer
+    from . import exporter
+
+    print('dependencies installed??')
+    print(dependencies_installed)
+
+    if dependencies_installed:
+        from . import reader
+
+    classes = (
+        exporter.ASE_OT_ExportOperator,
+    )
+
+    if dependencies_installed:
+        classes += reader.classes
+
+
+    def menu_func_export(self, context):
+        self.layout.operator(exporter.ASE_OT_ExportOperator.bl_idname, text='ASCII Scene Export (.ase)')
+
+    def menu_func_import(self, context):
+        self.layout.operator(reader.ASE_OT_ImportOperator.bl_idname, text='ASCII Scene Export (.ase)')
+
+
+    def register():
+        global dependencies_installed
+
+        for cls in preference_classes:
+            bpy.utils.register_class(cls)
+
+        try:
+            for dependency in dependencies:
+                import_module(module_name=dependency.module, global_name=dependency.name)
+            dependencies_installed = True
+        except ModuleNotFoundError:
+            # Don't register other panels, operators etc.
+            return
+
+        for cls in classes:
+            bpy.utils.register_class(cls)
+
+        bpy.types.TOPBAR_MT_file_export.append(menu_func_export)
+
+        if 'reader' in locals():
+            bpy.types.TOPBAR_MT_file_import.append(menu_func_import)
+
+
+    def unregister():
+        bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
+        if 'reader' in locals():
+            bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
+
+        for cls in classes:
+            bpy.utils.unregister_class(cls)

src/ase.py

@@ -52,4 +52,3 @@ class ASE(object):
     def __init__(self):
         self.materials = []
         self.geometry_objects = []
-

src/builder.py

@@ -1,14 +1,9 @@
-from typing import Iterable, Optional, List, Tuple
+from .ase import *
-
-from bpy.types import Object, Context, Material
-
-from .ase import ASE, ASEGeometryObject, ASEFace, ASEFaceNormal, ASEVertexNormal, ASEUVLayer, is_collision_name
 import bpy
 import bmesh
 import math
-from mathutils import Matrix, Vector
+from mathutils import Matrix
 
-SMOOTHING_GROUP_MAX = 32
 
 class ASEBuilderError(Exception):
     pass
@@ -16,63 +11,38 @@ class ASEBuilderError(Exception):
 
 class ASEBuilderOptions(object):
     def __init__(self):
+        self.scale = 1.0
         self.use_raw_mesh_data = False
-        self.materials: Optional[List[Material]] = None
-
-
-def get_object_matrix(obj: Object, asset_instance: Optional[Object] = None) -> Matrix:
-    if asset_instance is not None:
-        return asset_instance.matrix_world @ Matrix().Translation(asset_instance.instance_collection.instance_offset) @ obj.matrix_local
-    return obj.matrix_world
-
-
-def get_mesh_objects(objects: Iterable[Object]) -> List[Tuple[Object, Optional[Object]]]:
-    mesh_objects = []
-    for obj in objects:
-        if obj.type == 'MESH':
-            mesh_objects.append((obj, None))
-        elif obj.instance_collection:
-            for instance_object in obj.instance_collection.all_objects:
-                if instance_object.type == 'MESH':
-                    mesh_objects.append((instance_object, obj))
-    return mesh_objects
-
 
 
 class ASEBuilder(object):
-    def build(self, context: Context, options: ASEBuilderOptions, objects: Iterable[Object]):
+    def build(self, context, options: ASEBuilderOptions):
         ase = ASE()
 
         main_geometry_object = None
-        mesh_objects = get_mesh_objects(objects)
+        for selected_object in context.selected_objects:
-
+            if selected_object is None or selected_object.type != 'MESH':
-        context.window_manager.progress_begin(0, len(mesh_objects))
+                continue
-
-        ase.materials = options.materials
-
-        for object_index, (obj, asset_instance) in enumerate(mesh_objects):
-
-            matrix_world = get_object_matrix(obj, asset_instance)
 
             # Evaluate the mesh after modifiers are applied
             if options.use_raw_mesh_data:
-                mesh_object = obj
+                mesh_object = selected_object
                 mesh_data = mesh_object.data
             else:
                 depsgraph = context.evaluated_depsgraph_get()
                 bm = bmesh.new()
-                bm.from_object(obj, depsgraph)
+                bm.from_object(selected_object, depsgraph)
                 mesh_data = bpy.data.meshes.new('')
                 bm.to_mesh(mesh_data)
                 del bm
                 mesh_object = bpy.data.objects.new('', mesh_data)
-                mesh_object.matrix_world = matrix_world
+                mesh_object.matrix_world = selected_object.matrix_world
 
-            if not is_collision_name(obj.name) and main_geometry_object is not None:
+            if not is_collision_name(selected_object.name) and main_geometry_object is not None:
                 geometry_object = main_geometry_object
             else:
                 geometry_object = ASEGeometryObject()
-                geometry_object.name = obj.name
+                geometry_object.name = selected_object.name
                 if not geometry_object.is_collision:
                     main_geometry_object = geometry_object
                 ase.geometry_objects.append(geometry_object)
@@ -84,43 +54,41 @@ class ASEBuilder(object):
                 for edge in bm.edges:
                     if not edge.is_manifold:
                         del bm
-                        raise ASEBuilderError(f'Collision mesh \'{obj.name}\' is not manifold')
+                        raise ASEBuilderError(f'Collision mesh \'{selected_object.name}\' is not manifold')
                     if not edge.is_convex:
                         del bm
-                        raise ASEBuilderError(f'Collision mesh \'{obj.name}\' is not convex')
+                        raise ASEBuilderError(f'Collision mesh \'{selected_object.name}\' is not convex')
 
-            if not geometry_object.is_collision and len(obj.data.materials) == 0:
+            if not geometry_object.is_collision and len(selected_object.data.materials) == 0:
-                raise ASEBuilderError(f'Mesh \'{obj.name}\' must have at least one material')
+                raise ASEBuilderError(f'Mesh \'{selected_object.name}\' must have at least one material')
-
-            vertex_transform = Matrix.Rotation(math.pi, 4, 'Z') @ matrix_world
 
+            vertex_transform = Matrix.Scale(options.scale, 4) @ Matrix.Rotation(math.pi, 4, 'Z') @ mesh_object.matrix_world
             for vertex_index, vertex in enumerate(mesh_data.vertices):
                 geometry_object.vertices.append(vertex_transform @ vertex.co)
 
             material_indices = []
             if not geometry_object.is_collision:
-                for mesh_material_index, material in enumerate(obj.data.materials):
+                for mesh_material_index, material in enumerate(selected_object.data.materials):
                     if material is None:
-                        raise ASEBuilderError(f'Material slot {mesh_material_index + 1} for mesh \'{obj.name}\' cannot be empty')
+                        raise ASEBuilderError(f'Material slot {mesh_material_index + 1} for mesh \'{selected_object.name}\' cannot be empty')
-                    material_indices.append(ase.materials.index(material))
+                    try:
+                        # Reuse existing material entries for duplicates
+                        material_index = ase.materials.index(material.name)
+                    except ValueError:
+                        material_index = len(ase.materials)
+                        ase.materials.append(material.name)
+                    material_indices.append(material_index)
 
             mesh_data.calc_loop_triangles()
-
+            mesh_data.calc_normals_split()
-            # Calculate smoothing groups.
             poly_groups, groups = mesh_data.calc_smooth_groups(use_bitflags=False)
 
-            # Figure out how many scaling axes are negative.
-            # This is important for calculating the normals of the mesh.
-            _, _, scale = vertex_transform.decompose()
-            negative_scaling_axes = sum([1 for x in scale if x < 0])
-            should_invert_normals = negative_scaling_axes % 2 == 1
-
-            loop_triangle_index_order = (2, 1, 0) if should_invert_normals else (0, 1, 2)
-
             # Faces
             for face_index, loop_triangle in enumerate(mesh_data.loop_triangles):
                 face = ASEFace()
-                face.a, face.b, face.c = map(lambda j: geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[j]].vertex_index, loop_triangle_index_order)
+                face.a = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[0]].vertex_index
+                face.b = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[1]].vertex_index
+                face.c = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[2]].vertex_index
                 if not geometry_object.is_collision:
                     face.material_index = material_indices[loop_triangle.material_index]
                 # The UT2K4 importer only accepts 32 smoothing groups. Anything past this completely mangles the
@@ -130,7 +98,7 @@ class ASEBuilder(object):
                 # This may result in bad calculated normals on export in rare cases. For example, if a face with a
                 # smoothing group of 3 is adjacent to a face with a smoothing group of 35 (35 % 32 == 3), those faces
                 # will be treated as part of the same smoothing group.
-                face.smoothing = (poly_groups[loop_triangle.polygon_index] - 1) % SMOOTHING_GROUP_MAX
+                face.smoothing = (poly_groups[loop_triangle.polygon_index] - 1) % 32
                 geometry_object.faces.append(face)
 
             if not geometry_object.is_collision:
@@ -139,12 +107,10 @@ class ASEBuilder(object):
                     face_normal = ASEFaceNormal()
                     face_normal.normal = loop_triangle.normal
                     face_normal.vertex_normals = []
-                    for i in loop_triangle_index_order:
+                    for i in range(3):
                         vertex_normal = ASEVertexNormal()
                         vertex_normal.vertex_index = geometry_object.vertex_offset + mesh_data.loops[loop_triangle.loops[i]].vertex_index
                         vertex_normal.normal = loop_triangle.split_normals[i]
-                        if should_invert_normals:
-                            vertex_normal.normal = (-Vector(vertex_normal.normal)).to_tuple()
                         face_normal.vertex_normals.append(vertex_normal)
                     geometry_object.face_normals.append(face_normal)
 
@@ -159,25 +125,22 @@ class ASEBuilder(object):
 
                 # Texture Faces
                 for loop_triangle in mesh_data.loop_triangles:
-                    geometry_object.texture_vertex_faces.append(
+                    geometry_object.texture_vertex_faces.append((
-                        tuple(map(lambda l: geometry_object.texture_vertex_offset + loop_triangle.loops[l], loop_triangle_index_order))
+                        geometry_object.texture_vertex_offset + loop_triangle.loops[0],
-                    )
+                        geometry_object.texture_vertex_offset + loop_triangle.loops[1],
+                        geometry_object.texture_vertex_offset + loop_triangle.loops[2]
+                    ))
 
                 # Vertex Colors
                 if len(mesh_data.vertex_colors) > 0:
-                    if mesh_data.vertex_colors.active is not None:
                     vertex_colors = mesh_data.vertex_colors.active.data
                     for color in map(lambda x: x.color, vertex_colors):
                         geometry_object.vertex_colors.append(tuple(color[0:3]))
 
             # Update data offsets for next iteration
-            geometry_object.texture_vertex_offset += len(mesh_data.loops)
+            geometry_object.texture_vertex_offset = len(mesh_data.loops)
             geometry_object.vertex_offset = len(geometry_object.vertices)
 
-            context.window_manager.progress_update(object_index)
-
-        context.window_manager.progress_end()
-
         if len(ase.geometry_objects) == 0:
             raise ASEBuilderError('At least one mesh object must be selected')
 

src/exporter.py

@@ -0,0 +1,48 @@
+import bpy
+import bpy_extras
+from bpy.props import StringProperty, FloatProperty, EnumProperty, BoolProperty
+from .builder import *
+from .writer import *
+
+
+class ASE_OT_ExportOperator(bpy.types.Operator, bpy_extras.io_utils.ExportHelper):
+    bl_idname = 'io_scene_ase.ase_export'  # important since its how bpy.ops.import_test.some_data is constructed
+    bl_label = 'Export ASE'
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    filename_ext = '.ase'
+    filter_glob: StringProperty(
+        default="*.ase",
+        options={'HIDDEN'},
+        maxlen=255,  # Max internal buffer length, longer would be hilighted.
+    )
+    units: EnumProperty(
+        items=(('M', 'Meters', ''),
+               ('U', 'Unreal', '')),
+        name='Units',
+        default='U'
+    )
+    use_raw_mesh_data: BoolProperty(default=False, name='Raw Mesh Data')
+
+    units_scale = {
+        'M': 60.352,
+        'U': 1.0
+    }
+
+    def draw(self, context):
+        layout = self.layout
+        layout.prop(self, 'units', expand=False)
+        layout.prop(self, 'use_raw_mesh_data')
+
+    def execute(self, context):
+        options = ASEBuilderOptions()
+        options.scale = self.units_scale[self.units]
+        options.use_raw_mesh_data = self.use_raw_mesh_data
+        try:
+            ase = ASEBuilder().build(context, options)
+            ASEWriter().write(self.filepath, ase)
+            self.report({'INFO'}, 'ASE export successful')
+            return {'FINISHED'}
+        except ASEBuilderError as e:
+            self.report({'ERROR'}, str(e))
+            return {'CANCELLED'}

src/reader.py

@@ -0,0 +1,25 @@
+import bpy
+from bpy.props import StringProperty
+import bpy_extras
+
+
+
+from asepy import read_ase
+
+
+class ASE_OT_ImportOperator(bpy.types.Operator, bpy_extras.io_utils.ImportHelper):
+    bl_idname = 'io_scene_ase.ase_export'  # important since its how bpy.ops.import_test.some_data is constructed
+    bl_label = 'Export ASE'
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    filename_ext = '.ase'
+    filter_glob: StringProperty(
+        default="*.ase",
+        options={'HIDDEN'},
+        maxlen=255,
+    )
+
+
+classes = (
+    ASE_OT_ImportOperator
+)

src/tests/scripts/export_flat_test.py

@@ -0,0 +1,18 @@
+import bpy
+
+try:
+    bpy.ops.object.mode_set(mode='OBJECT')
+except:
+    pass
+
+bpy.ops.object.select_all(action='SELECT')
+bpy.ops.object.delete()
+
+bpy.ops.mesh.primitive_monkey_add()
+bpy.ops.object.select_all(action='SELECT')
+
+mesh_object = bpy.context.view_layer.objects.active
+material = bpy.data.materials.new('asd')
+mesh_object.data.materials.append(material)
+
+r = bpy.ops.io_scene_ase.ase_export(filepath=r'.\\flat.ase')

src/tests/tests.py

@@ -0,0 +1,28 @@
+import unittest
+import os
+from subprocess import run, PIPE, STDOUT
+from ..reader import read_ase
+from dotenv import load_dotenv
+
+
+def run_blender_script(script_path: str, args=list()):
+    return run([os.environ['BLENDER_PATH'], '--background', '--python', script_path, '--'] + args)
+
+
+class AseExportTests(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        load_dotenv()
+
+    def test_flat(self):
+        run_blender_script('src\\tests\\scripts\\export_flat_test.py')
+        read_ase('./flat.ase')
+
+    def test_smooth(self):
+        pass
+
+
+if __name__ == '__main__':
+    print()
+    unittest.main()

src/writer.py

@@ -1,3 +1,6 @@
+from .ase import *
+
+
 class ASEFile(object):
     def __init__(self):
         self.commands = []