Fixed vertex color lookup

Also changed `Use Raw Data` to an `Object Evaluation Mode` enum to
better match the terminology used in other parts of Blender.

.github/workflows/main.yml

@@ -0,0 +1,54 @@
+name: Build Extension
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+    
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      BLENDER_VERSION: blender-4.2.0-linux-x64
+      ADDON_NAME: io_scene_ase
+    steps:
+      - uses: actions/checkout@v3
+      - uses: SebRollen/toml-action@v1.2.0
+        id: read_manifest
+        with:
+          file: 'io_scene_ase/blender_manifest.toml'
+          field: 'version'
+      - name: Set derived environment variables
+        run: |
+          echo "BLENDER_FILENAME=${{ env.BLENDER_VERSION }}.tar.xz" >> $GITHUB_ENV
+          echo "BLENDER_URL=https://mirrors.iu13.net/blender/release/Blender4.2/${{ env.BLENDER_VERSION }}.tar.xz" >> $GITHUB_ENV
+      - name: Install Blender Dependencies
+        run: |
+          sudo apt-get install libxxf86vm-dev -y
+          sudo apt-get install libxfixes3 -y
+          sudo apt-get install libxi-dev -y
+          sudo apt-get install libxkbcommon-x11-0 -y
+          sudo apt-get install libgl1-mesa-glx -y
+      - name: Download & Extract Blender
+        run: |
+          wget -q $BLENDER_URL
+          tar -xf $BLENDER_FILENAME
+          rm -rf $BLENDER_FILENAME
+      - name: Add Blender executable to path
+        run: |
+          echo "${{ github.workspace }}/${{ env.BLENDER_VERSION }}/" >> $GITHUB_PATH
+      - name: Build extension
+        run: |
+          pushd ./${{ env.ADDON_NAME }}
+          blender --command extension build
+          mkdir artifact
+          unzip -q ${{ env.ADDON_NAME }}-${{ steps.read_manifest.outputs.value }}.zip -d ./artifact
+          popd
+      - name: Archive addon
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ env.ADDON_NAME }}-${{ github.ref_name }}-${{ github.sha }}
+          path: |
+            ./${{ env.ADDON_NAME }}/artifact/*

COPYING

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+
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+
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
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+  15. Disclaimer of Warranty.
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+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
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+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE

@@ -1,21 +0,0 @@
-MIT License
-
-Copyright (c) 2021 Darklight Games
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

README.md

@@ -1,4 +1,4 @@
-# io_scene_ase
+[![Build Extension](https://github.com/DarklightGames/io_scene_ase/actions/workflows/main.yml/badge.svg)](https://github.com/DarklightGames/io_scene_ase/actions/workflows/main.yml)
 
 This is a Blender addon allowing you to export static meshes to the now-defunct ASE (ASCII Scene Export) format still in use in legacy programs like Unreal Tournament 2004.
 

io_scene_ase/__init__.py

@@ -1,17 +1,3 @@
-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'
-}
-
 if 'bpy' in locals():
     import importlib
     if 'ase'        in locals(): importlib.reload(ase)
@@ -26,24 +12,26 @@ 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)')
 
 
 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/ase.py

@@ -1,3 +1,8 @@
+from typing import Optional, List
+
+from bpy.types import Material
+
+
 class ASEFace(object):
     def __init__(self):
         self.a = 0
@@ -50,6 +55,5 @@ class ASEGeometryObject(object):
 
 class ASE(object):
     def __init__(self):
-        self.materials = []
+        self.materials: List[Optional[Material]] = []
         self.geometry_objects = []
-

io_scene_ase/blender_manifest.toml

@@ -0,0 +1,27 @@
+schema_version = "1.0.0"
+id = "io_scene_ase"
+version = "2.1.2"
+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

@@ -0,0 +1,208 @@
+from typing import Iterable, Optional, List, Tuple
+
+from bpy.types import Object, Context, Material, Mesh
+
+from .ase import ASE, ASEGeometryObject, ASEFace, ASEFaceNormal, ASEVertexNormal, ASEUVLayer, is_collision_name
+import bpy
+import bmesh
+import math
+from mathutils import Matrix, Vector
+
+SMOOTHING_GROUP_MAX = 32
+
+class ASEBuildError(Exception):
+    pass
+
+
+class ASEBuildOptions(object):
+    def __init__(self):
+        self.object_eval_state = 'EVALUATED'
+        self.materials: Optional[List[Material]] = None
+        self.transform = Matrix.Identity(4)
+        self.should_export_vertex_colors = True
+        self.vertex_color_mode = 'ACTIVE'
+        self.has_vertex_colors = False
+        self.vertex_color_attribute = ''
+        self.should_invert_normals = False
+
+
+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
+
+
+def build_ase(context: Context, options: ASEBuildOptions, objects: Iterable[Object]) -> ASE:
+    ase = ASE()
+
+    main_geometry_object = None
+    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)
+
+        # Save the active color name for vertex color export.
+        active_color_name = obj.data.color_attributes.active_color_name
+
+        match options.object_eval_state:
+            case 'ORIGINAL':
+                mesh_object = obj
+                mesh_data = mesh_object.data
+            case 'EVALUATED':
+                # Evaluate the mesh after modifiers are applied
+                depsgraph = context.evaluated_depsgraph_get()
+                bm = bmesh.new()
+                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 = matrix_world
+
+        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 = obj.name
+            if not geometry_object.is_collision:
+                main_geometry_object = geometry_object
+            ase.geometry_objects.append(geometry_object)
+
+        if geometry_object.is_collision:
+            # Test that collision meshes are manifold and convex.
+            bm = bmesh.new()
+            bm.from_mesh(mesh_object.data)
+            for edge in bm.edges:
+                if not edge.is_manifold:
+                    del bm
+                    raise ASEBuildError(f'Collision mesh \'{obj.name}\' is not manifold')
+                if not edge.is_convex:
+                    del bm
+                    raise ASEBuildError(f'Collision mesh \'{obj.name}\' is not convex')
+
+        vertex_transform = Matrix.Rotation(math.pi, 4, 'Z') @ 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):
+                if material is None:
+                    raise ASEBuildError(f'Material slot {mesh_material_index + 1} for mesh \'{obj.name}\' cannot be empty')
+                material_indices.append(ase.materials.index(material))
+
+        if len(material_indices) == 0:
+            # If no materials are assigned to the mesh, just have a single empty material.
+            material_indices.append(0)
+
+        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
+        if options.should_invert_normals:
+            should_invert_normals = not should_invert_normals
+
+        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)
+            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
+            # smoothing groups and effectively makes the whole model use sharp-edge rendering.
+            # The fix is to constrain the smoothing group between 0 and 31 by applying a modulo of 32 to the actual
+            # smoothing group index.
+            # 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
+            geometry_object.faces.append(face)
+
+        if not geometry_object.is_collision:
+            # Normals
+            for face_index, loop_triangle in enumerate(mesh_data.loop_triangles):
+                face_normal = ASEFaceNormal()
+                face_normal.normal = loop_triangle.normal
+                face_normal.vertex_normals = []
+                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)
+
+            # Texture Coordinates
+            for i, uv_layer_data in enumerate([x.data for x in mesh_data.uv_layers]):
+                if i >= len(geometry_object.uv_layers):
+                    geometry_object.uv_layers.append(ASEUVLayer())
+                uv_layer = geometry_object.uv_layers[i]
+                for loop_index, loop in enumerate(mesh_data.loops):
+                    u, v = uv_layer_data[loop_index].uv
+                    uv_layer.texture_vertices.append((u, v, 0.0))
+
+            # Texture Faces
+            for loop_triangle in mesh_data.loop_triangles:
+                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 options.should_export_vertex_colors and options.has_vertex_colors:
+                color_attribute = None
+                match options.vertex_color_mode:
+                    case 'ACTIVE':
+                        color_attribute = mesh_data.color_attributes.get(active_color_name, None)
+                    case 'EXPLICIT':
+                        color_attribute = mesh_data.color_attributes.get(options.vertex_color_attribute, None)
+
+                if color_attribute is not None:
+                    # Make sure that the selected color attribute is on the CORNER domain.
+                    if color_attribute.domain != 'CORNER':
+                        raise ASEBuildError(f'Color attribute \'{color_attribute.name}\' for object \'{obj.name}\' must have domain of \'CORNER\' (found  \'{color_attribute.domain}\')')
+
+                    for color in map(lambda x: x.color, color_attribute.data):
+                        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.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 ASEBuildError('At least one mesh object must be selected')
+
+    if main_geometry_object is None:
+        raise ASEBuildError('At least one non-collision mesh must be exported')
+
+    return ase

io_scene_ase/exporter.py

@@ -0,0 +1,287 @@
+import os.path
+from typing import Iterable, List, Set, Union
+
+import bpy
+from bpy_extras.io_utils import ExportHelper
+from bpy.props import StringProperty, CollectionProperty, PointerProperty, IntProperty, EnumProperty, BoolProperty
+from bpy.types import Operator, Material, PropertyGroup, UIList, Object, FileHandler
+from mathutils import Matrix, Vector
+
+from .builder import ASEBuildOptions, ASEBuildError, get_mesh_objects, build_ase
+from .writer import ASEWriter
+
+
+class ASE_PG_material(PropertyGroup):
+    material: PointerProperty(type=Material)
+
+
+def get_vertex_color_attributes_from_objects(objects: Iterable[Object]) -> Set[str]:
+    '''
+    Get the unique vertex color attributes from all the selected objects.
+    :param objects: The objects to search for vertex color attributes.
+    :return: A set of unique vertex color attributes.
+    '''
+    items = set()
+    for obj in filter(lambda x: x.type == 'MESH', objects):
+        for layer in filter(lambda x: x.domain == 'CORNER', obj.data.color_attributes):
+            items.add(layer.name)
+    return items
+
+
+def vertex_color_attribute_items(self, context):
+    # Get the unique color attributes from all the selected objects.
+    return [(x, x, '') for x in sorted(get_vertex_color_attributes_from_objects(context.selected_objects))]
+
+
+class ASE_PG_export(PropertyGroup):
+    material_list: CollectionProperty(name='Materials', type=ASE_PG_material)
+    material_list_index: IntProperty(name='Index', default=0)
+    should_export_vertex_colors: BoolProperty(name='Export Vertex Colors', default=True)
+    vertex_color_mode: EnumProperty(name='Vertex Color Mode', items=(
+        ('ACTIVE', 'Active', 'Use the active vertex color attribute'),
+        ('EXPLICIT', 'Explicit', 'Use the vertex color attribute specified below'),
+    ))
+    has_vertex_colors: BoolProperty(name='Has Vertex Colors', default=False, options={'HIDDEN'})
+    vertex_color_attribute: EnumProperty(name='Attribute', items=vertex_color_attribute_items)
+    should_invert_normals: BoolProperty(name='Invert Normals', default=False, description='Invert the normals of the exported geometry. This should be used if the software you are exporting to uses a different winding order than Blender')
+
+
+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))
+
+
+object_eval_state_items = (
+    ('EVALUATED', 'Evaluated', 'Use data from fully evaluated object'),
+    ('ORIGINAL', 'Original', 'Use data from original object with no modifiers applied'),
+)
+
+
+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)
+    object_eval_state: EnumProperty(
+        items=object_eval_state_items,
+        name='Data',
+        default='EVALUATED'
+    )
+
+    @classmethod
+    def poll(cls, context):
+        if not any(x.type == 'MESH' for x in context.selected_objects):
+            cls.poll_message_set('At least one mesh must be selected')
+            return False
+        return True
+
+    def draw(self, context):
+        layout = self.layout
+        pg = context.scene.ase_export
+
+        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', '', pg, 'material_list', pg, '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='')
+
+
+        has_vertex_colors = len(get_vertex_color_attributes_from_objects(context.selected_objects)) > 0
+        vertex_colors_header, vertex_colors_panel = layout.panel_prop(pg, 'should_export_vertex_colors')
+        row = vertex_colors_header.row()
+        row.enabled = has_vertex_colors
+        row.prop(pg, 'should_export_vertex_colors', text='Vertex Colors')
+
+        if vertex_colors_panel:
+            vertex_colors_panel.use_property_split = True
+            vertex_colors_panel.use_property_decorate = False
+            if has_vertex_colors:
+                vertex_colors_panel.prop(pg, 'vertex_color_mode', text='Mode')
+                if pg.vertex_color_mode == 'EXPLICIT':
+                    vertex_colors_panel.prop(pg, 'vertex_color_attribute', icon='GROUP_VCOL')
+            else:
+                vertex_colors_panel.label(text='No vertex color attributes found')
+
+        advanced_header, advanced_panel = layout.panel('Advanced', default_closed=True)
+        advanced_header.label(text='Advanced')
+
+        if advanced_panel:
+            advanced_panel.use_property_split = True
+            advanced_panel.use_property_decorate = False
+            advanced_panel.prop(self, 'object_eval_state')
+            advanced_panel.prop(pg, 'should_invert_normals')
+
+    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)
+
+        self.filepath = f'{context.active_object.name}.ase'
+
+        context.window_manager.fileselect_add(self)
+
+        return {'RUNNING_MODAL'}
+
+    def execute(self, context):
+        pg = getattr(context.scene, 'ase_export')
+
+        options = ASEBuildOptions()
+        options.object_eval_state = self.object_eval_state
+        options.should_export_vertex_colors = pg.should_export_vertex_colors
+        options.vertex_color_mode = pg.vertex_color_mode
+        options.has_vertex_colors = len(get_vertex_color_attributes_from_objects(context.selected_objects)) > 0
+        options.vertex_color_attribute = pg.vertex_color_attribute
+        options.materials = [x.material for x in pg.material_list]
+        options.should_invert_normals = pg.should_invert_normals
+        try:
+            ase = build_ase(context, options, context.selected_objects)
+            ASEWriter().write(self.filepath, ase)
+            self.report({'INFO'}, 'ASE exported successfully')
+            return {'FINISHED'}
+        except ASEBuildError as e:
+            self.report({'ERROR'}, str(e))
+            return {'CANCELLED'}
+
+
+class ASE_OT_export_collection(Operator, ExportHelper):
+    bl_idname = 'io_scene_ase.ase_export_collection'
+    bl_label = 'Export collection to ASE'
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_description = 'Export collection to ASE'
+    filename_ext = '.ase'
+    filter_glob: StringProperty(
+        default="*.ase",
+        options={'HIDDEN'},
+        maxlen=255,  # Max internal buffer length, longer would be highlighted.
+    )
+    object_eval_state: EnumProperty(
+        items=object_eval_state_items,
+        name='Data',
+        default='EVALUATED'
+    )
+
+    collection: StringProperty()
+
+
+    def draw(self, context):
+        layout = self.layout
+
+        advanced_header, advanced_panel = layout.panel('Advanced', default_closed=True)
+        advanced_header.label(text='Advanced')
+
+        if advanced_panel:
+            advanced_panel.use_property_split = True
+            advanced_panel.use_property_decorate = False
+            advanced_panel.prop(self, 'object_eval_state')
+
+    def execute(self, context):
+        collection = bpy.data.collections.get(self.collection)
+
+        options = ASEBuildOptions()
+        options.object_eval_state = self.object_eval_state
+        options.transform = Matrix.Translation(-Vector(collection.instance_offset))
+
+        # 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 = build_ase(context, options, collection.all_objects)
+        except ASEBuildError as e:
+            self.report({'ERROR'}, str(e))
+            return {'CANCELLED'}
+
+        try:
+            ASEWriter().write(self.filepath, ase)
+        except PermissionError as e:
+            self.report({'ERROR'}, 'ASCII Scene Export: ' + str(e))
+            return {'CANCELLED'}
+
+        return {'FINISHED'}
+
+
+class ASE_FH_export(FileHandler):
+    bl_idname = 'ASE_FH_export'
+    bl_label = 'ASCII Scene Export'
+    bl_export_operator = ASE_OT_export_collection.bl_idname
+    bl_file_extensions = '.ase'
+
+
+
+classes = (
+    ASE_PG_material,
+    ASE_UL_materials,
+    ASE_PG_export,
+    ASE_OT_export,
+    ASE_OT_export_collection,
+    ASE_OT_material_list_move_down,
+    ASE_OT_material_list_move_up,
+    ASE_FH_export,
+)

io_scene_ase/writer.py

@@ -1,4 +1,4 @@
-from .ase import *
+from .ase import ASE
 
 
 class ASEFile(object):
@@ -102,7 +102,7 @@ class ASEWriter(object):
             self.write_command(command)
 
     @staticmethod
-    def build_ase_tree(ase) -> ASEFile:
+    def build_ase_tree(ase: ASE) -> ASEFile:
         root = ASEFile()
         root.add_command('3DSMAX_ASCIIEXPORT').push_datum(200)
 
@@ -194,6 +194,6 @@ class ASEWriter(object):
 
     def write(self, filepath, ase):
         self.indent = 0
-        ase_file = self.build_ase_tree(ase)
         with open(filepath, 'w') as self.fp:
+            ase_file = self.build_ase_tree(ase)
             self.write_file(ase_file)

src/builder.py

@@ -1,136 +0,0 @@
-from .ase import *
-import bpy
-import bmesh
-import math
-from mathutils import Matrix
-
-
-class ASEBuilderError(Exception):
-    pass
-
-
-class ASEBuilderOptions(object):
-    def __init__(self):
-        self.scale = 1.0
-
-
-class ASEBuilder(object):
-    def build(self, context, options: ASEBuilderOptions):
-        ase = ASE()
-
-        main_geometry_object = None
-        for obj in context.selected_objects:
-            if obj is None or obj.type != 'MESH':
-                continue
-
-            mesh_data = obj.data
-
-            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 = obj.name
-                if not geometry_object.is_collision:
-                    main_geometry_object = geometry_object
-                ase.geometry_objects.append(geometry_object)
-
-            if geometry_object.is_collision:
-                bm = bmesh.new()
-                bm.from_mesh(obj.data)
-                for edge in bm.edges:
-                    if not edge.is_manifold:
-                        raise ASEBuilderError(f'Collision mesh \'{obj.name}\' is not manifold')
-                    if not edge.is_convex:
-                        raise ASEBuilderError(f'Collision mesh \'{obj.name}\' is not convex')
-
-            if not geometry_object.is_collision and len(mesh_data.materials) == 0:
-                raise ASEBuilderError(f'Mesh \'{obj.name}\' must have at least one material')
-
-            vertex_transform = Matrix.Scale(options.scale, 4) @ Matrix.Rotation(math.pi, 4, 'Z') @ obj.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(mesh_data.materials):
-                    if material is None:
-                        raise ASEBuilderError(f'Material slot {mesh_material_index + 1} for mesh \'{obj.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)
-
-            mesh_data.calc_loop_triangles()
-            mesh_data.calc_normals_split()
-            poly_groups, groups = mesh_data.calc_smooth_groups(use_bitflags=False)
-
-            # 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
-                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
-                # smoothing groups and effectively makes the whole model use sharp-edge rendering.
-                # The fix is to constrain the smoothing group between 0 and 31 by applying a modulo of 32 to the actual
-                # smoothing group index.
-                # 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
-                geometry_object.faces.append(face)
-
-            # Normals
-            if not geometry_object.is_collision:
-                for face_index, loop_triangle in enumerate(mesh_data.loop_triangles):
-                    face_normal = ASEFaceNormal()
-                    face_normal.normal = loop_triangle.normal
-                    face_normal.vertex_normals = []
-                    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]
-                        face_normal.vertex_normals.append(vertex_normal)
-                    geometry_object.face_normals.append(face_normal)
-
-            if not geometry_object.is_collision:
-                # Texture Coordinates
-                for i, uv_layer_data in enumerate([x.data for x in mesh_data.uv_layers]):
-                    if i >= len(geometry_object.uv_layers):
-                        geometry_object.uv_layers.append(ASEUVLayer())
-                    uv_layer = geometry_object.uv_layers[i]
-                    for loop_index, loop in enumerate(mesh_data.loops):
-                        u, v = uv_layer_data[loop_index].uv
-                        uv_layer.texture_vertices.append((u, v, 0.0))
-
-            # Texture Faces
-            if not geometry_object.is_collision:
-                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]
-                    ))
-
-            # Vertex Colors
-            if len(mesh_data.vertex_colors) > 0:
-                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.vertex_offset = len(geometry_object.vertices)
-
-        if len(ase.geometry_objects) == 0:
-            raise ASEBuilderError('At least one mesh object must be selected')
-
-        if main_geometry_object is None:
-            raise ASEBuilderError('At least one non-collision mesh must be exported')
-
-        return ase

src/exporter.py

@@ -1,47 +0,0 @@
-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'
-    )
-
-    units_scale = {
-        'M': 60.352,
-        'U': 1.0
-    }
-
-    def draw(self, context):
-        layout = self.layout
-        layout.prop(self, 'units', expand=False)
-
-    def execute(self, context):
-        options = ASEBuilderOptions()
-        options.scale = self.units_scale[self.units]
-        try:
-            ase = ASEBuilder().build(context, options)
-            ASEWriter().write(self.filepath, ase)
-            self.report({'INFO'}, 'ASE exported successful')
-            return {'FINISHED'}
-        except ASEBuilderError as e:
-            self.report({'ERROR'}, str(e))
-            return {'CANCELLED'}