Fixed and added some strings

* The "Scale"/"Units" option has been removed from the exporter. If users want to work in proper units, they should override their Scene unit scaling.
* Asset instances can now be exported.
* Added operator to batch export top-level collections.

io_scene_ase/__init__.py

@@ -1,17 +1,3 @@
-bl_info = {
-    'name': 'ASCII Scene Export (ASE)',
-    'description': 'Export ASE (ASCII Scene Export) files',
-    'author': 'Colin Basnett (Darklight Games)',
-    'version': (2, 0, 0),
-    'blender': (4, 0, 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'
-}
-
 if 'bpy' in locals():
     import importlib
     if 'ase'        in locals(): importlib.reload(ase)
@@ -26,24 +12,27 @@ from . import builder
 from . import writer
 from . import exporter
 
-classes = (
-    exporter.ASE_OT_ExportOperator,
-)
+classes = exporter.classes
 
 
 def menu_func_export(self, context):
-    self.layout.operator(exporter.ASE_OT_ExportOperator.bl_idname, text='ASCII Scene Export (.ase)')
+    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

@@ -0,0 +1,27 @@
+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/builder.py

@@ -1,9 +1,14 @@
-from .ase import *
+from typing import Iterable, Optional, List, Tuple
+
+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
+from mathutils import Matrix, Vector
 
+SMOOTHING_GROUP_MAX = 32
 
 class ASEBuilderError(Exception):
     pass
@@ -11,38 +16,63 @@ 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, options: ASEBuilderOptions):
+    def build(self, context: Context, options: ASEBuilderOptions, objects: Iterable[Object]):
         ase = ASE()
 
         main_geometry_object = None
-        for selected_object in context.selected_objects:
-            if selected_object is None or selected_object.type != 'MESH':
-                continue
+        mesh_objects = get_mesh_objects(objects)
+
+        context.window_manager.progress_begin(0, len(mesh_objects))
+
+        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 = selected_object
+                mesh_object = obj
                 mesh_data = mesh_object.data
             else:
                 depsgraph = context.evaluated_depsgraph_get()
                 bm = bmesh.new()
-                bm.from_object(selected_object, depsgraph)
+                bm.from_object(obj, 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 = selected_object.matrix_world
+                mesh_object.matrix_world = matrix_world
 
-            if not is_collision_name(selected_object.name) and main_geometry_object is not None:
+            if not is_collision_name(obj.name) and main_geometry_object is not None:
                 geometry_object = main_geometry_object
             else:
                 geometry_object = ASEGeometryObject()
-                geometry_object.name = selected_object.name
+                geometry_object.name = obj.name
                 if not geometry_object.is_collision:
                     main_geometry_object = geometry_object
                 ase.geometry_objects.append(geometry_object)
@@ -54,41 +84,43 @@ class ASEBuilder(object):
                 for edge in bm.edges:
                     if not edge.is_manifold:
                         del bm
-                        raise ASEBuilderError(f'Collision mesh \'{selected_object.name}\' is not manifold')
+                        raise ASEBuilderError(f'Collision mesh \'{obj.name}\' is not manifold')
                     if not edge.is_convex:
                         del bm
-                        raise ASEBuilderError(f'Collision mesh \'{selected_object.name}\' is not convex')
+                        raise ASEBuilderError(f'Collision mesh \'{obj.name}\' is not convex')
 
-            if not geometry_object.is_collision and len(selected_object.data.materials) == 0:
-                raise ASEBuilderError(f'Mesh \'{selected_object.name}\' must have at least one material')
+            if not geometry_object.is_collision and len(obj.data.materials) == 0:
+                raise ASEBuilderError(f'Mesh \'{obj.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(selected_object.data.materials):
+                for mesh_material_index, material in enumerate(obj.data.materials):
                     if material is None:
-                        raise ASEBuilderError(f'Material slot {mesh_material_index + 1} for mesh \'{selected_object.name}\' cannot be empty')
-                    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)
+                        raise ASEBuilderError(f'Material slot {mesh_material_index + 1} for mesh \'{obj.name}\' cannot be empty')
+                    material_indices.append(ase.materials.index(material))
 
             mesh_data.calc_loop_triangles()
 
+            # 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 = 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
+                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)
                 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
@@ -98,7 +130,7 @@ 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) % 32
+                face.smoothing = (poly_groups[loop_triangle.polygon_index] - 1) % SMOOTHING_GROUP_MAX
                 geometry_object.faces.append(face)
 
             if not geometry_object.is_collision:
@@ -107,10 +139,12 @@ class ASEBuilder(object):
                     face_normal = ASEFaceNormal()
                     face_normal.normal = loop_triangle.normal
                     face_normal.vertex_normals = []
-                    for i in range(3):
+                    for i in loop_triangle_index_order:
                         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)
 
@@ -125,11 +159,9 @@ class ASEBuilder(object):
 
                 # Texture Faces
                 for loop_triangle in mesh_data.loop_triangles:
-                    geometry_object.texture_vertex_faces.append((
-                        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]
-                    ))
+                    geometry_object.texture_vertex_faces.append(
+                        tuple(map(lambda l: geometry_object.texture_vertex_offset + loop_triangle.loops[l], loop_triangle_index_order))
+                    )
 
                 # Vertex Colors
                 if len(mesh_data.vertex_colors) > 0:
@@ -142,6 +174,10 @@ class ASEBuilder(object):
             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')
 

io_scene_ase/exporter.py

@@ -1,50 +1,200 @@
+import os.path
+from typing import Iterable, List, Set, Union
+
 from bpy_extras.io_utils import ExportHelper
-from bpy.props import StringProperty, EnumProperty, BoolProperty
-from bpy.types import Operator
-from .builder import *
-from .writer import *
+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_OT_ExportOperator(Operator, ExportHelper):
-    bl_idname = 'io_scene_ase.ase_export'  # important since its how bpy.ops.import_test.some_data is constructed
+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.
     )
-    units: EnumProperty(
-        default='U',
-        items=(('M', 'Meters', ''),
-               ('U', 'Unreal', '')),
-        name='Units'
-    )
     use_raw_mesh_data: BoolProperty(
         default=False,
         description='No modifiers will be evaluated as part of the exported mesh',
         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
+
+        # 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)
-            ASEWriter().write(self.filepath, ase)
-            self.report({'INFO'}, 'ASE exported successful')
-            return {'FINISHED'}
+                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,
+)

io_scene_ase/writer.py

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