Fix for collision manifold and convexity tests being run on non-collision meshes

Now applying the export space transform
* Now adding a dummy material when none is provided.
2024-12-28 16:23:40 -08:00 · 2024-12-28 15:06:52 -08:00 · 2024-12-22 18:49:38 -08:00 · 2024-12-22 18:26:07 -08:00 · 2024-12-22 18:22:27 -08:00 · 2024-12-22 18:14:22 -08:00
14 changed files with 1881 additions and 249 deletions
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -0,0 +1,55 @@
 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 -y
          sudo apt-get install libglx-mesa0 -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/*
--- a/674
+++ b/674
@@ -0,0 +1,674 @@
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 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
 USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
 DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
 PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGES.
  17. Interpretation of Sections 15 and 16.
  If the disclaimer of warranty and limitation of liability provided
 above cannot be given local legal effect according to their terms,
 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>.
--- a/21
+++ b/21
@@ -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.
--- a/README.md
+++ b/README.md
@@ -1,3 +1,18 @@
-# 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.
+This is a Blender addon allowing you to export static meshes to the now-defunct ASE (ASCII Scene Export) format used in legacy programs like Unreal Tournament 2004.
 # Installation
 Install the latest version from [Blender Extensions](https://extensions.blender.org/add-ons/io-scene-ase/).
 Legacy versions are available on the [releases](https://github.com/DarklightGames/io_scene_ase/releases) page, but are not recommended for use.
 # Features
 * Selection and [collection exporters](https://docs.blender.org/manual/en/latest/scene_layout/collections/collections.html#exporters).
 * Fully support for handling of [Collection Instances](https://docs.blender.org/manual/en/latest/scene_layout/object/properties/instancing/collection.html). 
 * Full support for exporting multiple UV layers.
 * Easily reorder materials when using the collection exporter.
 * Support for scaling and coordinate system conversion on export.
 # Resources:
 * https://wiki.beyondunreal.com/Legacy:ASE_File_Format
--- a/io_scene_ase/init.py
+++ b/io_scene_ase/init.py
@@ -0,0 +1,39 @@
 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 'dfs'        in locals(): importlib.reload(dfs)
 import bpy
 import bpy.utils.previews
 from . import ase
 from . import builder
 from . import writer
 from . import exporter
 from . import dfs
 classes = exporter.classes
 def menu_func_export(self, context):
    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)
--- a/io_scene_ase/ase.py
+++ b/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
@@ -26,14 +31,20 @@ def is_collision_name(name):
    return name.startswith('MCDCX_')
 class ASEUVLayer(object):
    def __init__(self):
        self.texture_vertices = []
 class ASEGeometryObject(object):
    def __init__(self):
        self.name = ''
        self.vertices = []
-        self.texture_vertices = []
+        self.uv_layers = []
        self.faces = []
        self.texture_vertex_faces = []
        self.face_normals = []
        self.vertex_colors = []
        self.vertex_offset = 0
        self.texture_vertex_offset = 0
@@ -44,6 +55,5 @@ class ASEGeometryObject(object):
 class ASE(object):
    def __init__(self):
-        self.materials = []
+        self.materials: List[str] = []
        self.geometry_objects = []
--- a/io_scene_ase/blender_manifest.toml
+++ b/io_scene_ase/blender_manifest.toml
@@ -0,0 +1,27 @@
 schema_version = "1.0.0"
 id = "io_scene_ase"
 version = "2.2.0"
 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"
--- a/io_scene_ase/builder.py
+++ b/io_scene_ase/builder.py
@@ -0,0 +1,279 @@
 from typing import Iterable, Optional, List, Tuple, cast
 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
 from .dfs import DfsObject
 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
        self.should_export_visible_only = True
        self.scale = 1.0
        self.forward_axis = 'X'
        self.up_axis = 'Z'
 def get_vector_from_axis_identifier(axis_identifier: str) -> Vector:
    match axis_identifier:
        case 'X':
            return Vector((1.0, 0.0, 0.0))
        case 'Y':
            return Vector((0.0, 1.0, 0.0))
        case 'Z':
            return Vector((0.0, 0.0, 1.0))
        case '-X':
            return Vector((-1.0, 0.0, 0.0))
        case '-Y':
            return Vector((0.0, -1.0, 0.0))
        case '-Z':
            return Vector((0.0, 0.0, -1.0))
 def get_coordinate_system_transform(forward_axis: str = 'X', up_axis: str = 'Z') -> Matrix:
    forward = get_vector_from_axis_identifier(forward_axis)
    up = get_vector_from_axis_identifier(up_axis)
    left = up.cross(forward)
    return Matrix((
        (forward.x, forward.y, forward.z, 0.0),
        (left.x, left.y, left.z, 0.0),
        (up.x, up.y, up.z, 0.0),
        (0.0, 0.0, 0.0, 1.0)
    ))
 def build_ase(context: Context, options: ASEBuildOptions, dfs_objects: Iterable[DfsObject]) -> ASE:
    ase = ASE()
    ase.materials = [x.name for x in options.materials]
    # If no materials are assigned to the object, add an empty material.
    # This is necessary for the ASE format to be compatible with the UT2K4 importer.
    if len(ase.materials) == 0:
        ase.materials.append('')
    dfs_objects = list(dfs_objects)
    dfs_objects_processed = 0
    context.window_manager.progress_begin(0, len(dfs_objects))
    class GeometryObjectInfo:
        def __init__(self, name: str):
            self.name = name
            self.dfs_objects = []
    main_geometry_object_info = GeometryObjectInfo('io_scene_ase')
    geometry_object_infos: List[GeometryObjectInfo] = [
        main_geometry_object_info,
    ]
    for object_index, dfs_object in enumerate(dfs_objects):
        if is_collision_name(dfs_object.obj.name):
            geometry_object_info = GeometryObjectInfo(dfs_object.obj.name)
            geometry_object_info.dfs_objects.append(dfs_object)
            geometry_object_infos.append(geometry_object_info)
        else:
            main_geometry_object_info.dfs_objects.append(dfs_object)
    # Sort the DFS objects into collision and non-collision objects.
    coordinate_system_transform = get_coordinate_system_transform(options.forward_axis, options.up_axis)
    for geometry_object_info in geometry_object_infos:
        geometry_object = ASEGeometryObject()
        geometry_object.name = geometry_object_info.name
        max_uv_layers = 0
        for dfs_object in geometry_object_info.dfs_objects:
            mesh_data = cast(Mesh, dfs_object.obj.data)
            max_uv_layers = max(max_uv_layers, len(mesh_data.uv_layers))
        geometry_object.uv_layers = [ASEUVLayer() for _ in range(max_uv_layers)]
        for dfs_object in geometry_object_info.dfs_objects:
            obj = dfs_object.obj
            if geometry_object.is_collision:
                # Test that collision meshes are manifold and convex.
                bm = bmesh.new()
                bm.from_mesh(obj.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')
            matrix_world = dfs_object.matrix_world
            # 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
            vertex_transform = (Matrix.Rotation(math.pi, 4, 'Z') @
                                Matrix.Scale(options.scale, 4) @
                                options.transform @
                                matrix_world)
            for vertex_index, vertex in enumerate(mesh_data.vertices):
                vertex = vertex_transform @ vertex.co
                vertex = coordinate_system_transform @ vertex
                geometry_object.vertices.append(vertex)
            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.name))
            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)
            # Gather the list of unique material indices in the loop triangles.
            face_material_indices = {loop_triangle.material_index for loop_triangle in mesh_data.loop_triangles}
            # Make sure that each material index is within the bounds of the material indices list.
            for material_index in face_material_indices:
                if material_index >= len(material_indices):
                    raise ASEBuildError(f'Material index {material_index} for mesh \'{obj.name}\' is out of bounds.\n'
                                        f'This means that one or more faces are assigned to a material slot that does '
                                        f'not exist.\n'
                                        f'The referenced material indices in the faces are: {sorted(list(face_material_indices))}.\n'
                                        f'Either add enough materials to the object or assign faces to existing material slots.'
                                        )
            del face_material_indices
            # 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]):
                    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))
                # Add zeroed texture vertices for any missing UV layers.
                for i in range(len(mesh_data.uv_layers), max_uv_layers):
                    uv_layer = geometry_object.uv_layers[i]
                    for _ in mesh_data.loops:
                        uv_layer.texture_vertices.append((0.0, 0.0, 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:
                    match options.vertex_color_mode:
                        case 'ACTIVE':
                            color_attribute_name = active_color_name
                        case 'EXPLICIT':
                            color_attribute_name = options.vertex_color_attribute
                        case _:
                            raise ASEBuildError('Invalid vertex color mode')
                    color_attribute = mesh_data.color_attributes.get(color_attribute_name, 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)
            dfs_objects_processed += 1
            context.window_manager.progress_update(dfs_objects_processed)
        ase.geometry_objects.append(geometry_object)
    context.window_manager.progress_end()
    if len(ase.geometry_objects) == 0:
        raise ASEBuildError('At least one mesh object must be selected')
    return ase
--- a/io_scene_ase/dfs.py
+++ b/io_scene_ase/dfs.py
@@ -0,0 +1,144 @@
 '''
 Depth-first object iterator functions for Blender collections and view layers.
 These functions are used to iterate over objects in a collection or view layer in a depth-first manner, including
 instances. This is useful for exporters that need to traverse the object hierarchy in a predictable order.
 '''
 from typing import Optional, Set, Iterable, List
 from bpy.types import Collection, Object, ViewLayer, LayerCollection, Context
 from mathutils import Matrix
 class DfsObject:
    '''
    Represents an object in a depth-first search.
    '''
    def __init__(self, obj: Object, instance_objects: List[Object], matrix_world: Matrix):
        self.obj = obj
        self.instance_objects = instance_objects
        self.matrix_world = matrix_world
    @property
    def is_visible(self) -> bool:
        '''
        Check if the object is visible.
        @return: True if the object is visible, False otherwise.
        '''
        if self.instance_objects:
            return self.instance_objects[-1].visible_get()
        return self.obj.visible_get()
    @property
    def is_selected(self) -> bool:
        '''
        Check if the object is selected.
        @return: True if the object is selected, False otherwise.
        '''
        if self.instance_objects:
            return self.instance_objects[-1].select_get()
        return self.obj.select_get()
 def _dfs_object_children(obj: Object, collection: Collection) -> Iterable[Object]:
    '''
    Construct a list of objects in hierarchy order from `collection.objects`, only keeping those that are in the
    collection.
    @param obj: The object to start the search from.
    @param collection:  The collection to search in.
    @return: An iterable of objects in hierarchy order.
    '''
    yield obj
    for child in obj.children:
        if child.name in collection.objects:
            yield from _dfs_object_children(child, collection)
 def dfs_objects_in_collection(collection: Collection) -> Iterable[Object]:
    '''
    Returns a depth-first iterator over all objects in a collection, only keeping those that are directly in the
    collection.
    @param collection: The collection to search in.
    @return: An iterable of objects in hierarchy order.
    '''
    objects_hierarchy = []
    for obj in collection.objects:
        if obj.parent is None or obj.parent not in set(collection.objects):
            objects_hierarchy.append(obj)
    for obj in objects_hierarchy:
        yield from _dfs_object_children(obj, collection)
 def dfs_collection_objects(collection: Collection, visible_only: bool = False) -> Iterable[DfsObject]:
    '''
    Depth-first search of objects in a collection, including recursing into instances.
    @param collection: The collection to search in.
    @return: An iterable of tuples containing the object, the instance objects, and the world matrix.
    '''
    yield from _dfs_collection_objects_recursive(collection)
 def _dfs_collection_objects_recursive(
        collection: Collection,
        instance_objects: Optional[List[Object]] = None,
        matrix_world: Matrix = Matrix.Identity(4),
        visited: Optional[Set[Object]]=None
 ) -> Iterable[DfsObject]:
    '''
    Depth-first search of objects in a collection, including recursing into instances.
    This is a recursive function.
    @param collection: The collection to search in.
    @param instance_objects: The running hierarchy of instance objects.
    @param matrix_world: The world matrix of the current object.
    @param visited: A set of visited object-instance pairs.
    @return: An iterable of tuples containing the object, the instance objects, and the world matrix.
    '''
    # We want to also yield the top-level instance object so that callers can inspect the selection status etc.
    if visited is None:
        visited = set()
    if instance_objects is None:
        instance_objects = list()
    # First, yield all objects in child collections.
    for child in collection.children:
        yield from _dfs_collection_objects_recursive(child, instance_objects, matrix_world.copy(), visited)
    # Then, evaluate all objects in this collection.
    for obj in dfs_objects_in_collection(collection):
        visited_pair = (obj, instance_objects[-1] if instance_objects else None)
        if visited_pair in visited:
            continue
        # If this an instance, we need to recurse into it.
        if obj.instance_collection is not None:
            # Calculate the instance transform.
            instance_offset_matrix = Matrix.Translation(-obj.instance_collection.instance_offset)
            # Recurse into the instance collection.
            yield from _dfs_collection_objects_recursive(obj.instance_collection,
                                                         instance_objects + [obj],
                                                         matrix_world @ (obj.matrix_world @ instance_offset_matrix),
                                                         visited)
        else:
            # Object is not an instance, yield it.
            yield DfsObject(obj, instance_objects, matrix_world @ obj.matrix_world)
            visited.add(visited_pair)
 def dfs_view_layer_objects(view_layer: ViewLayer) -> Iterable[DfsObject]:
    '''
    Depth-first iterator over all objects in a view layer, including recursing into instances.
    @param view_layer: The view layer to inspect.
    @return: An iterable of tuples containing the object, the instance objects, and the world matrix.
    '''
    def layer_collection_objects_recursive(layer_collection: LayerCollection, visited: Set[Object]=None):
        if visited is None:
            visited = set()
        for child in layer_collection.children:
            yield from layer_collection_objects_recursive(child, visited=visited)
        # Iterate only the top-level objects in this collection first.
        yield from _dfs_collection_objects_recursive(layer_collection.collection, visited=visited)
    yield from layer_collection_objects_recursive(view_layer.layer_collection)
--- a/io_scene_ase/exporter.py
+++ b/io_scene_ase/exporter.py
@@ -0,0 +1,604 @@
 from typing import Iterable, List, Set, Union, cast, Optional
 import bpy
 from bpy_extras.io_utils import ExportHelper
 from bpy.props import StringProperty, CollectionProperty, PointerProperty, IntProperty, EnumProperty, BoolProperty, \
    FloatProperty
 from bpy.types import Operator, Material, PropertyGroup, UIList, Object, FileHandler, Event, Context, SpaceProperties, \
    Collection
 from mathutils import Matrix, Vector
 from .builder import ASEBuildOptions, ASEBuildError, build_ase
 from .writer import ASEWriter
 class ASE_PG_material(PropertyGroup):
    material: PointerProperty(type=Material)
 class ASE_PG_string(PropertyGroup):
    string: StringProperty()
 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 = []
    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(f'Material slots cannot be empty ({mesh_object.name}, material slot index {i})')
            if material not in materials:
                materials.append(material)
    return 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
 def get_collection_from_context(context: Context) -> Optional[Collection]:
    if context.space_data.type != 'PROPERTIES':
        return None
    space_data = cast(SpaceProperties, context.space_data)
    if space_data.use_pin_id:
        return cast(Collection, space_data.pin_id)
    else:
        return context.collection
 def get_collection_export_operator_from_context(context: Context) -> Optional['ASE_OT_export_collection']:
    collection = get_collection_from_context(context)
    if collection is None:
        return None
    if 0 > collection.active_exporter_index >= len(collection.exporters):
        return None
    exporter = collection.exporters[collection.active_exporter_index]
    # TODO: make sure this is actually an ASE exporter.
    return exporter.export_properties
 class ASE_OT_material_order_add(Operator):
    bl_idname = 'ase_export.material_order_add'
    bl_label = 'Add'
    bl_description = 'Add a material to the list'
    def invoke(self, context: Context, event: Event) -> Union[Set[str], Set[int]]:
        # TODO: get the region that this was invoked from and set the collection to the collection of the region.
        print(event)
        return self.execute(context)
    def execute(self, context: 'Context') -> Union[Set[str], Set[int]]:
        # Make sure this is being invoked from the properties region.
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return {'INVALID_CONTEXT'}
        material_string = operator.material_order.add()
        material_string.string = 'Material'
        return {'FINISHED'}
 class ASE_OT_material_order_remove(Operator):
    bl_idname = 'ase_export.material_order_remove'
    bl_label = 'Remove'
    bl_description = 'Remove the selected material from the list'
    @classmethod
    def poll(cls, context: Context):
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return False
        return 0 <= operator.material_order_index < len(operator.material_order)
    def execute(self, context: 'Context') -> Union[Set[str], Set[int]]:
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return {'INVALID_CONTEXT'}
        operator.material_order.remove(operator.material_order_index)
        return {'FINISHED'}
 class ASE_OT_material_order_move_up(Operator):
    bl_idname = 'ase_export.material_order_move_up'
    bl_label = 'Move Up'
    bl_description = 'Move the selected material up one slot'
    @classmethod
    def poll(cls, context: Context):
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return False
        return operator.material_order_index > 0
    def execute(self, context: 'Context') -> Union[Set[str], Set[int]]:
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return {'INVALID_CONTEXT'}
        operator.material_order.move(operator.material_order_index, operator.material_order_index - 1)
        operator.material_order_index -= 1
        return {'FINISHED'}
 class ASE_OT_material_order_move_down(Operator):
    bl_idname = 'ase_export.material_order_move_down'
    bl_label = 'Move Down'
    bl_description = 'Move the selected material down one slot'
    @classmethod
    def poll(cls, context: Context):
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return False
        return operator.material_order_index < len(operator.material_order) - 1
    def execute(self, context: 'Context') -> Union[Set[str], Set[int]]:
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return {'INVALID_CONTEXT'}
        operator.material_order.move(operator.material_order_index, operator.material_order_index + 1)
        operator.material_order_index += 1
        return {'FINISHED'}
 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_UL_material_names(UIList):
    def draw_item(self, context, layout, data, item, icon, active_data, active_propname, index):
        row = layout.row()
        material = bpy.data.materials.get(item.string, None)
        row.prop(item, 'string', text='', emboss=False, icon_value=layout.icon(material) if material is not None else 0)
 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_populate_material_order_list(Operator):
    bl_idname = 'ase_export.populate_material_order_list'
    bl_label = 'Populate Material Order List'
    bl_description = 'Populate the material order list with the materials used by objects in the collection'
    visible_only: BoolProperty(name='Visible Only', default=True, description='Populate the list with only the materials of visible objects')
    def invoke(self, context: 'Context', event: 'Event'):
        return context.window_manager.invoke_props_dialog(self)
    def execute(self, context):
        collection = get_collection_from_context(context)
        operator = get_collection_export_operator_from_context(context)
        if operator is None:
            return {'CANCELLED'}
        from .dfs import dfs_collection_objects
        mesh_objects = list(map(lambda x: x.obj, filter(lambda x: x.obj.type == 'MESH', dfs_collection_objects(collection, True))))
        # Exclude objects that are not visible.
        materials = get_unique_materials(mesh_objects)
        operator.material_order.clear()
        for material in materials:
            m = operator.material_order.add()
            m.string = material.name
        return {'FINISHED'}
 empty_set = set()
 axis_identifiers = ('X', 'Y', 'Z', '-X', '-Y', '-Z')
 forward_items = (
    ('X', 'X Forward', ''),
    ('Y', 'Y Forward', ''),
    ('Z', 'Z Forward', ''),
    ('-X', '-X Forward', ''),
    ('-Y', '-Y Forward', ''),
    ('-Z', '-Z Forward', ''),
 )
 up_items = (
    ('X', 'X Up', ''),
    ('Y', 'Y Up', ''),
    ('Z', 'Z Up', ''),
    ('-X', '-X Up', ''),
    ('-Y', '-Y Up', ''),
    ('-Z', '-Z Up', ''),
 )
 def forward_axis_update(self, _context: Context):
    if self.forward_axis == self.up_axis:
        self.up_axis = next((axis for axis in axis_identifiers if axis != self.forward_axis), 'Z')
 def up_axis_update(self, _context: Context):
    if self.up_axis == self.forward_axis:
        self.forward_axis = next((axis for axis in axis_identifiers if axis != self.up_axis), 'X')
 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)
    # TODO: why are these not part of the ASE_PG_export property group?
    object_eval_state: EnumProperty(
        items=object_eval_state_items,
        name='Data',
        default='EVALUATED'
    )
    should_export_visible_only: BoolProperty(name='Visible Only', default=False, description='Export only visible objects')
    scale: FloatProperty(name='Scale', default=1.0, min=0.0001, soft_max=1000.0, description='Scale factor to apply to the exported geometry')
    forward_axis: EnumProperty(name='Forward', items=forward_items, default='X', update=forward_axis_update)
    up_axis: EnumProperty(name='Up', items=up_items, default='Z', update=up_axis_update)
    @classmethod
    def poll(cls, context):
        if not any(x.type == 'MESH' or (x.type == 'EMPTY' and x.instance_collection is not None) for x in context.selected_objects):
            cls.poll_message_set('At least one mesh or instanced collection must be selected')
            return False
        return True
    def draw(self, context):
        layout = self.layout
        pg = context.scene.ase_export
        flow = layout.grid_flow()
        flow.use_property_split = True
        flow.use_property_decorate = False
        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')
        transform_header, transform_panel = layout.panel('Transform', default_closed=True)
        transform_header.label(text='Transform')
        if transform_panel:
            transform_panel.use_property_split = True
            transform_panel.use_property_decorate = False
            transform_panel.prop(self, 'scale')
            transform_panel.prop(self, 'forward_axis')
            transform_panel.prop(self, 'up_axis')
        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]]:
        from .dfs import dfs_view_layer_objects
        mesh_objects = list(map(lambda x: x.obj, filter(lambda x: x.is_selected and x.obj.type == 'MESH', dfs_view_layer_objects(context.view_layer))))
        if len(mesh_objects) == 0:
            self.report({'ERROR'}, 'No mesh objects selected')
            return {'CANCELLED'}
        pg = getattr(context.scene, 'ase_export')
        try:
            populate_material_list(mesh_objects, pg.material_list)
        except RuntimeError as e:
            self.report({'ERROR'}, str(e))
            return {'CANCELLED'}
        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
        options.should_export_visible_only = self.should_export_visible_only
        options.scale = self.scale
        options.forward_axis = self.forward_axis
        options.up_axis = self.up_axis
        from .dfs import dfs_view_layer_objects
        dfs_objects = list(filter(lambda x: x.is_selected and x.obj.type == 'MESH', dfs_view_layer_objects(context.view_layer)))
        try:
            ase = build_ase(context, options, dfs_objects)
            # Calculate some statistics about the ASE file to display in the console.
            object_count = len(ase.geometry_objects)
            material_count = len(ase.materials)
            face_count = sum(len(x.faces) for x in ase.geometry_objects)
            vertex_count = sum(len(x.vertices) for x in ase.geometry_objects)
            ASEWriter().write(self.filepath, ase)
            self.report({'INFO'}, f'ASE exported successfully ({object_count} objects, {material_count} materials, {face_count} faces, {vertex_count} vertices)')
            return {'FINISHED'}
        except ASEBuildError as e:
            self.report({'ERROR'}, str(e))
            return {'CANCELLED'}
 export_space_items = [
    ('WORLD', 'World Space', 'Export the collection in world-space (i.e., as it appears in the 3D view)'),
    ('INSTANCE', 'Instance Space', 'Export the collection as an instance (transforms the world-space geometry by the inverse of the instance offset)'),
 ]
 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()
    material_order: CollectionProperty(name='Materials', type=ASE_PG_string)
    material_order_index: IntProperty(name='Index', default=0)
    export_space: EnumProperty(name='Export Space', items=export_space_items, default='INSTANCE')
    should_export_visible_only: BoolProperty(name='Visible Only', default=False, description='Export only visible objects')
    scale: FloatProperty(name='Scale', default=1.0, min=0.0001, soft_max=1000.0, description='Scale factor to apply to the exported geometry')
    forward_axis: EnumProperty(name='Forward', items=forward_items, default='X', update=forward_axis_update)
    up_axis: EnumProperty(name='Up', items=up_items, default='Z', update=up_axis_update)
    def draw(self, context):
        layout = self.layout
        flow = layout.grid_flow()
        flow.use_property_split = True
        flow.use_property_decorate = False
        flow.prop(self, 'should_export_visible_only')
        materials_header, materials_panel = layout.panel('Materials', default_closed=True)
        materials_header.label(text='Materials')
        if materials_panel:
            row = materials_panel.row()
            row.template_list('ASE_UL_material_names', '', self, 'material_order', self, 'material_order_index')
            col = row.column(align=True)
            col.operator(ASE_OT_material_order_add.bl_idname, icon='ADD', text='')
            col.operator(ASE_OT_material_order_remove.bl_idname, icon='REMOVE', text='')
            col.separator()
            col.operator(ASE_OT_material_order_move_up.bl_idname, icon='TRIA_UP', text='')
            col.operator(ASE_OT_material_order_move_down.bl_idname, icon='TRIA_DOWN', text='')
            col.separator()
            col.operator(ASE_OT_populate_material_order_list.bl_idname, icon='FILE_REFRESH', text='')
        transform_header, transform_panel = layout.panel('Transform', default_closed=True)
        transform_header.label(text='Transform')
        if transform_panel:
            transform_panel.use_property_split = True
            transform_panel.use_property_decorate = False
            transform_panel.prop(self, 'scale')
            transform_panel.prop(self, 'forward_axis')
            transform_panel.prop(self, 'up_axis')
        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(self, 'export_space')
    def execute(self, context):
        collection = bpy.data.collections.get(self.collection)
        options = ASEBuildOptions()
        options.object_eval_state = self.object_eval_state
        options.scale = self.scale
        options.forward_axis = self.forward_axis
        options.up_axis = self.up_axis
        match self.export_space:
            case 'WORLD':
                options.transform = Matrix.Identity(4)
            case 'INSTANCE':
                options.transform = Matrix.Translation(-Vector(collection.instance_offset))
        from .dfs import dfs_collection_objects
        dfs_objects = list(filter(lambda x: x.obj.type == 'MESH', dfs_collection_objects(collection, options.should_export_visible_only)))
        mesh_objects = [x.obj for x in dfs_objects]
        # Get all the materials used by the objects in the collection.
        options.materials = get_unique_materials(mesh_objects)
        # Sort the materials based on the order in the material order list, keeping in mind that the material order list
        # may not contain all the materials used by the objects in the collection.
        material_order = [x.string for x in self.material_order]
        material_order_map = {x: i for i, x in enumerate(material_order)}
        # Split the list of materials into two lists: one for materials that appear in the material order list, and one
        # for materials that do not. Then append the two lists together, with the ordered materials first.
        ordered_materials = []
        unordered_materials = []
        for material in options.materials:
            if material.name in material_order_map:
                ordered_materials.append(material)
            else:
                unordered_materials.append(material)
        ordered_materials.sort(key=lambda x: material_order_map.get(x.name, len(material_order)))
        options.materials = ordered_materials + unordered_materials
        try:
            ase = build_ase(context, options, dfs_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_PG_string,
    ASE_UL_materials,
    ASE_UL_material_names,
    ASE_PG_export,
    ASE_OT_export,
    ASE_OT_export_collection,
    ASE_OT_material_list_move_down,
    ASE_OT_material_list_move_up,
    ASE_OT_material_order_add,
    ASE_OT_material_order_remove,
    ASE_OT_material_order_move_down,
    ASE_OT_material_order_move_up,
    ASE_OT_populate_material_order_list,
    ASE_FH_export,
 )
--- a/io_scene_ase/writer.py
+++ b/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)
@@ -146,21 +146,23 @@ class ASEWriter(object):
                face_node.push_sub_command('MESH_MTLID').push_datum(face.material_index)
            # Texture Coordinates
-            if len(geometry_object.texture_vertices) > 0:
+            for i, uv_layer in enumerate(geometry_object.uv_layers):
-                mesh_node.push_child('MESH_NUMTVERTEX').push_datum(len(geometry_object.texture_vertices))
+                parent_node = mesh_node if i == 0 else mesh_node.push_child('MESH_MAPPINGCHANNEL')
-                tvertlist_node = mesh_node.push_child('MESH_TVERTLIST')
+                if i > 0:
-                for tvert_index, tvert in enumerate(geometry_object.texture_vertices):
+                    parent_node.push_datum(i + 1)
                parent_node.push_child('MESH_NUMTVERTEX').push_datum(len(uv_layer.texture_vertices))
                tvertlist_node = parent_node.push_child('MESH_TVERTLIST')
                for tvert_index, tvert in enumerate(uv_layer.texture_vertices):
                    tvert_node = tvertlist_node.push_child('MESH_TVERT')
                    tvert_node.push_datum(tvert_index)
                    tvert_node.push_data(list(tvert))
-
+                # Texture Faces
-            # Texture Faces
+                if len(geometry_object.texture_vertex_faces) > 0:
-            if len(geometry_object.texture_vertex_faces) > 0:
+                    parent_node.push_child('MESH_NUMTVFACES').push_datum(len(geometry_object.texture_vertex_faces))
-                mesh_node.push_child('MESH_NUMTVFACES').push_datum(len(geometry_object.texture_vertex_faces))
+                    texture_faces_node = parent_node.push_child('MESH_TFACELIST')
-                texture_faces_node = mesh_node.push_child('MESH_TFACELIST')
+                    for texture_face_index, texture_face in enumerate(geometry_object.texture_vertex_faces):
-                for texture_face_index, texture_face in enumerate(geometry_object.texture_vertex_faces):
+                        texture_face_node = texture_faces_node.push_child('MESH_TFACE')
-                    texture_face_node = texture_faces_node.push_child('MESH_TFACE')
+                        texture_face_node.push_data([texture_face_index] + list(texture_face))
                    texture_face_node.push_data([texture_face_index] + list(texture_face))
            # Normals
            if len(geometry_object.face_normals) > 0:
@@ -174,12 +176,24 @@ class ASEWriter(object):
                        vertex_normal_node.push_datum(vertex_normal.vertex_index)
                        vertex_normal_node.push_data(list(vertex_normal.normal))
            # Vertex Colors
            if len(geometry_object.vertex_colors) > 0:
                mesh_node.push_child('MESH_NUMCVERTEX').push_datum(len(geometry_object.vertex_colors))
                cvert_list = mesh_node.push_child('MESH_CVERTLIST')
                for i, vertex_color in enumerate(geometry_object.vertex_colors):
                    cvert_list.push_child('MESH_VERTCOL').push_datum(i).push_data(vertex_color)
                mesh_node.push_child('MESH_NUMCVFACES').push_datum(len(geometry_object.texture_vertex_faces))
                texture_faces_node = mesh_node.push_child('MESH_CFACELIST')
                for texture_face_index, texture_face in enumerate(geometry_object.texture_vertex_faces):
                    texture_face_node = texture_faces_node.push_child('MESH_CFACE')
                    texture_face_node.push_data([texture_face_index] + list(texture_face))
            geomobject_node.push_child('MATERIAL_REF').push_datum(0)
        return root
    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)
--- a/src/init.py
+++ b/src/init.py
@@ -1,51 +0,0 @@
 bl_info = {
    'name': 'ASCII Scene Export',
    'description': 'Export ASE (ASCII Scene Export) files',
    'author': 'Colin Basnett (Darklight Games)',
    'version': (1, 0, 0),
    '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)
    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 bpy.props import IntProperty, CollectionProperty, StringProperty
 import os
 from . import ase
 from . import builder
 from . import writer
 from . import exporter
 classes = (
    exporter.ASE_OT_ExportOperator,
 )
 def menu_func_export(self, context):
    self.layout.operator(exporter.ASE_OT_ExportOperator.bl_idname, text='ASCII Scene Export (.ase)')
 def register():
    for cls in classes:
        bpy.utils.register_class(cls)
    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)
 def unregister():
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)
    for cls in classes:
        bpy.utils.unregister_class(cls)
--- a/src/builder.py
+++ b/src/builder.py
@@ -1,110 +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 not geometry_object.is_collision and len(mesh_data.materials) == 0:
                raise ASEBuilderError(f'Mesh \'{obj.name}\' must have at least one material')
            geometry_object.vertex_offset += len(geometry_object.vertices)
            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]
                face.smoothing = poly_groups[loop_triangle.polygon_index]
                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)
            uv_layer = mesh_data.uv_layers.active.data
            # Texture Coordinates
            geometry_object.texture_vertex_offset += len(geometry_object.texture_vertices)
            if not geometry_object.is_collision:
                for loop_index, loop in enumerate(mesh_data.loops):
                    u, v = uv_layer[loop_index].uv
                    geometry_object.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]
                    ))
        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
--- a/src/exporter.py
+++ b/src/exporter.py
@@ -1,47 +0,0 @@
 import bpy
 import bpy_extras
 from bpy.props import StringProperty, FloatProperty, EnumProperty
 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'}
Author	SHA1	Message	Date
Colin Basnett	922b8eac24	Fix for collision manifold and convexity tests being run on non-collision meshes	2024-12-28 16:23:40 -08:00
Colin Basnett	24adafe039	Now applying the export space transform * Now adding a dummy material when none is provided.	2024-12-28 15:06:52 -08:00
Colin Basnett	0c0c5fcf2d	Updated the README	2024-12-22 18:49:38 -08:00
Colin Basnett	7644980a43	Fixed typo	2024-12-22 18:26:07 -08:00
Colin Basnett	3afb04c01b	Fix for automation dependencies	2024-12-22 18:22:27 -08:00
Colin Basnett	34714099ce	Fixed a bug where secondary UV layers would not be exported correctly if not all objects shared the same number of UV layers	2024-12-22 18:14:22 -08:00
Colin Basnett	324481d8d2	Added the ability to change the forward/up axis of the export. Useful when you want to change the handedness or orientation of an export without changing anything in the scene. Also fixed some issues with the normal contextual export operator such as not respecting the selection status of the objects and doing double-exports on objects.	2024-12-16 17:02:33 -08:00
Colin Basnett	0bf35f6157	Incremented version to 2.2.0	2024-12-09 00:05:59 -08:00
Colin Basnett	4b73bf4cd0	A number of additions to functionality: * The "Scale" option to export dialog. * Added "Visible Only" option to export dialog. * Collection Instances can now be exported (handles recursion etc.) * Added material re-ordering (available on collection exporter only)	2024-12-09 00:05:38 -08:00
Colin Basnett	d6c0186031	`get_unique_materials` now preserves the order that the materials were encountered	2024-09-29 12:01:57 -07:00
Colin Basnett	a2a4720cb4	Added "Export Space" for collection exporters This allows the instance offset to be negated.	2024-09-20 16:13:50 -07:00
Colin Basnett	57a4cb5170	Fixed error that could occur when exporting a mesh with vertex colors but no UV layer	2024-09-20 16:12:49 -07:00
Colin Basnett	fa51768e65	ASE export success message now displays some stats about the ASE file (material count, face count etc.)	2024-09-20 11:42:47 -07:00
Colin Basnett	638042202b	Added better error handling when material slots are empty	2024-09-20 11:37:38 -07:00
Colin Basnett	37c255f270	Incremented version to 2.1.3	2024-09-20 11:26:12 -07:00
Colin Basnett	3ad6a18f21	Added the ability to provide explicit ordering in collection exporter Operators cannot reference ID datablocks for some reason still, but I just made it so you can type in the name of the materials manually. This allows stable and predictable material ordering in batch operations.	2024-09-20 11:25:25 -07:00
Colin Basnett	d2230fb975	Minor formatting fix	2024-09-20 11:24:11 -07:00
Colin Basnett	2740568c17	Added better error handling when faces reference materials that do not exist	2024-09-20 11:23:18 -07:00
Colin Basnett	cc3a9c39fc	Fixed vertex color lookup	2024-09-14 02:39:46 -07:00
Colin Basnett	4ca686bd53	Increased version to 2.1.1	2024-09-13 17:30:30 -07:00
Colin Basnett	17679273a3	Fixed vertex color export & added "invert normals" option	2024-09-13 17:29:33 -07:00
Colin Basnett	438e332c36	The default `filepath` is now based on the name of the active object	2024-07-22 01:31:00 -07:00
Colin Basnett	0dd55e46a7	Added poll operator to the ASE exporter	2024-07-22 01:28:59 -07:00
Colin Basnett	59be7f3d01	Merge branch 'main' of https://github.com/DarklightGames/io_scene_ase	2024-07-18 12:12:47 -07:00
Colin Basnett	4729541f5c	Removed defunct reference to deprecated export operator	2024-07-18 12:12:42 -07:00
Colin Basnett	279290dee1	Update main.yml	2024-07-18 12:05:15 -07:00
Colin Basnett	c8ca818e43	Added handling for collection exports Also changed `Use Raw Data` to an `Object Evaluation Mode` enum to better match the terminology used in other parts of Blender.	2024-07-18 11:19:57 -07:00
Colin Basnett	cfc533b2ad	Merge branch 'main' of https://github.com/DarklightGames/io_scene_ase	2024-07-18 11:10:53 -07:00
Colin Basnett	a63e2b1828	Update README.md	2024-07-15 16:31:24 -07:00
Colin Basnett	1d82fca78a	Made `.ase` wording consistent in manifest	2024-07-02 11:28:12 -07:00
Colin Basnett	39abd0edfe	Added an extra step to read the version of the addon from the TOML file and use it to determine the right name of the .zip file	2024-07-01 18:36:02 -07:00
Colin Basnett	eb231faed5	Added workflow file to build addon	2024-07-01 18:14:12 -07:00
Colin Basnett	056986bcbb	Replaced MIT license with GPL v3 license	2024-07-01 18:09:01 -07:00
Colin Basnett	eb5a9ed564	Fixed and added some strings	2024-06-30 15:50:18 -07:00
Colin Basnett	09895e1fa1	Updated manifest	2024-06-30 11:21:20 -07:00
Colin Basnett	ac4d96b396	Added blender_manifest file for compatiblity with Blender Extensions platform	2024-06-17 12:13:45 -07:00
Colin Basnett	3fe4a6af53	A number of changes and additions to the exporter: * 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.	2024-05-28 21:57:15 -07:00
Colin Basnett	972ea5deda	Added the ability to re-order materials when exporting multiple objects	2024-05-27 20:51:17 -07:00
Colin Basnett	2ff4a661f2	Fixed an issue with the order of texture vertex indices when one or more objects has negative scaling	2024-05-27 18:44:13 -07:00
Colin Basnett	956de550b2	Removed debug printing	2024-05-26 14:23:00 -07:00
Colin Basnett	bd90088aed	Added logic to detect negative object scaling values and accomodate WYSIWYG normals on export Also added "export collections" operator that exports each viible collection as an ASE	2024-05-26 13:47:26 -07:00
Colin Basnett	ecfd9897b1	Moved files to named subfolder for easier packaging	2024-02-28 18:50:12 -08:00
Colin Basnett	a3e350e96e	Fix for rare error if vertex colors were somehow not active	2024-02-28 18:49:00 -08:00
Colin Basnett	7b417ae425	Incremented version to 2.0.0 and the minimum version to 4.0.0	2023-11-10 23:29:45 -08:00
Colin Basnett	c59f16ed5e	Removed deprecated call to `calc_normals_split`	2023-11-10 23:28:30 -08:00
Colin Basnett	51be4b8ee9	Removed zip file committed in error	2022-08-15 21:53:24 -07:00
Colin Basnett	94b3554f2f	Fixed multi-object export texture corruption error This fixes the bug where exporting 3 or more objects would result in one or more objects have corrupted texture coordinates	2022-08-15 21:39:13 -07:00
Colin Basnett	ce6ae4a64c	Added description to raw mesh data option	2022-08-11 02:09:27 -07:00
Colin Basnett	a593224b14	Added (ASE) to the name of the addon This should make it easier to find in the addon list when searching	2022-08-11 02:08:26 -07:00
Colin Basnett	feb88794b2	Incremented version to 1.2.0	2022-08-11 02:07:38 -07:00
Colin Basnett	499e6f19c6	The default units are now Unreal instead of Meters	2022-08-11 02:06:46 -07:00
Colin Basnett	1bdc158f08	Merge branch 'feature-wysiwyg'	2022-08-11 00:02:10 -07:00
Colin Basnett	e2e3905e2e	Fixed a bug where collision meshes would not properly be exported in WYSIWYG mode	2022-05-20 16:40:55 -07:00
Colin Basnett	77f5aa21a5	Removed defunct comment	2022-05-16 17:29:10 -07:00
Colin Basnett	92f588b760	Initial commit for WYSIWYG export. Modifiers are automatically applied.	2022-05-11 17:12:29 -07:00
Colin Basnett	2b467b2da4	Minor formatting fix and comments	2022-05-01 02:05:48 -07:00
Colin Basnett	4b6231a094	Incremented version to 1.1.1	2022-02-09 14:30:15 -08:00
Colin Basnett	50a7d003cb	Added manifold and convexity tests for collision objects. You will now be unable to export a concave or non-manifold collision shapes.	2022-02-08 21:42:26 -08:00
Colin Basnett	bd1a7257fd	Added support for vertex colors.	2022-01-22 14:42:57 -08:00
Colin Basnett	7ebeb0d262	Added support for exporting multiple UV layers.	2021-12-27 02:07:50 -08:00
Colin Basnett	8edfac9bfb	Fixed a bug where exporting more than two mesh objects would result in a corrupted ASE file.	2021-12-16 15:28:52 -08:00
Colin Basnett	1121b18fcb	Incremented version.	2021-08-23 23:24:02 -07:00
Colin Basnett	dcd8c3ea65	Fix for bug #2 (missing unit settings on export in Blender 2.93)	2021-08-23 23:22:37 -07:00
Colin Basnett	283a44aec5	Removed zip file from the repository 🤦	2021-08-13 12:54:05 -07:00
Colin Basnett	b0aa604832	Actually fixed the smoothing group problem!	2021-04-01 17:27:17 -07:00
Colin Basnett	7d723fef29	Merge remote-tracking branch 'origin/main' into main	2021-04-01 16:30:34 -07:00
Colin Basnett	04a9e65599	Fixed a bug where the ASE exporter did not properly export smoothing groups	2021-04-01 16:30:06 -07:00
Colin Basnett	e0e2f83db4	Update README.md	2021-02-06 01:49:05 -08:00