fbx_utils.py

                    return ObjectWrapper(bo_par, self.bdata.parent)
                else:  # Fallback to mere object parenting.
                    return ObjectWrapper(self.bdata.parent)
            else:
                # Mere object parenting.
                return ObjectWrapper(self.bdata.parent)
        elif self._tag == 'DP':
            return ObjectWrapper(self._ref)
        else:  # self._tag == 'BO'
            return ObjectWrapper(self.bdata.parent, self._ref) or ObjectWrapper(self._ref)
    parent = property(get_parent)

    def get_bdata_pose_bone(self):
        if self._tag == 'BO':
            return self._ref.pose.bones[self.bdata.name]
        return None
    bdata_pose_bone = property(get_bdata_pose_bone)

    def get_matrix_local(self):
        if self._tag == 'OB':
            return self.bdata.matrix_local.copy()
        elif self._tag == 'DP':
            return self._ref.matrix_world.inverted_safe() @ self._dupli_matrix
        else:  # 'BO', current pose
            # PoseBone.matrix is in armature space, bring in back in real local one!
            par = self.bdata.parent
            par_mat_inv = self._ref.pose.bones[par.name].matrix.inverted_safe() if par else Matrix()
            return par_mat_inv @ self._ref.pose.bones[self.bdata.name].matrix
    matrix_local = property(get_matrix_local)

    def get_matrix_global(self):
        if self._tag == 'OB':
            return self.bdata.matrix_world.copy()
        elif self._tag == 'DP':
            return self._dupli_matrix
        else:  # 'BO', current pose
            return self._ref.matrix_world @ self._ref.pose.bones[self.bdata.name].matrix
    matrix_global = property(get_matrix_global)

    def get_matrix_rest_local(self):
        if self._tag == 'BO':
            # Bone.matrix_local is in armature space, bring in back in real local one!
            par = self.bdata.parent
            par_mat_inv = par.matrix_local.inverted_safe() if par else Matrix()
            return par_mat_inv @ self.bdata.matrix_local
        else:
            return self.matrix_local.copy()
    matrix_rest_local = property(get_matrix_rest_local)

    def get_matrix_rest_global(self):
        if self._tag == 'BO':
            return self._ref.matrix_world @ self.bdata.matrix_local
        else:
            return self.matrix_global.copy()
    matrix_rest_global = property(get_matrix_rest_global)

    # #### Transform and helpers
    def has_valid_parent(self, objects):
        par = self.parent
        if par in objects:
            if self._tag == 'OB':
                par_type = self.bdata.parent_type
                if par_type in {'OBJECT', 'BONE'}:
                    return True
                else:
                    print("Sorry, “{}” parenting type is not supported".format(par_type))
                    return False
            return True
        return False

    def use_bake_space_transform(self, scene_data):
        # NOTE: Only applies to object types supporting this!!! Currently, only meshes and the like...
        # TODO: Check whether this can work for bones too...
        return (scene_data.settings.bake_space_transform and self._tag in {'OB', 'DP'} and
                self.bdata.type in BLENDER_OBJECT_TYPES_MESHLIKE | {'EMPTY'})

    def fbx_object_matrix(self, scene_data, rest=False, local_space=False, global_space=False):
        """
        Generate object transform matrix (*always* in matching *FBX* space!).
        If local_space is True, returned matrix is *always* in local space.
        Else if global_space is True, returned matrix is always in world space.
        If both local_space and global_space are False, returned matrix is in parent space if parent is valid,
        else in world space.
        Note local_space has precedence over global_space.
        If rest is True and object is a Bone, returns matching rest pose transform instead of current pose one.
        Applies specific rotation to bones, lamps and cameras (conversion Blender -> FBX).
        """
        # Objects which are not bones and do not have any parent are *always* in global space
        # (unless local_space is True!).
        is_global = (not local_space and
                     (global_space or not (self._tag in {'DP', 'BO'} or self.has_valid_parent(scene_data.objects))))

        # Objects (meshes!) parented to armature are not parented to anything in FBX, hence we need them
        # in global space, which is their 'virtual' local space...
        is_global = is_global or self.parented_to_armature

        # Since we have to apply corrections to some types of object, we always need local Blender space here...
        matrix = self.matrix_rest_local if rest else self.matrix_local
        parent = self.parent

        # Bones, lamps and cameras need to be rotated (in local space!).
        if self._tag == 'BO':
            # If we have a bone parent we need to undo the parent correction.
            if not is_global and scene_data.settings.bone_correction_matrix_inv and parent and parent.is_bone:
                matrix = scene_data.settings.bone_correction_matrix_inv @ matrix
            # Apply the bone correction.
            if scene_data.settings.bone_correction_matrix:
                matrix = matrix @ scene_data.settings.bone_correction_matrix
        elif self.bdata.type == 'LIGHT':
            matrix = matrix @ MAT_CONVERT_LIGHT
        elif self.bdata.type == 'CAMERA':
            matrix = matrix @ MAT_CONVERT_CAMERA

        if self._tag in {'DP', 'OB'} and parent:
            if parent._tag == 'BO':
                # In bone parent case, we get transformation in **bone tip** space (sigh).
                # Have to bring it back into bone root, which is FBX expected value.
                matrix = Matrix.Translation((0, (parent.bdata.tail - parent.bdata.head).length, 0)) @ matrix

        # Our matrix is in local space, time to bring it in its final desired space.
        if parent:
            if is_global:
                # Move matrix to global Blender space.
                matrix = (parent.matrix_rest_global if rest else parent.matrix_global) @ matrix
            elif parent.use_bake_space_transform(scene_data):
                # Blender's and FBX's local space of parent may differ if we use bake_space_transform...
                # Apply parent's *Blender* local space...
                matrix = (parent.matrix_rest_local if rest else parent.matrix_local) @ matrix
                # ...and move it back into parent's *FBX* local space.
                par_mat = parent.fbx_object_matrix(scene_data, rest=rest, local_space=True)
                matrix = par_mat.inverted_safe() @ matrix

        if self.use_bake_space_transform(scene_data):
            # If we bake the transforms we need to post-multiply inverse global transform.
            # This means that the global transform will not apply to children of this transform.
            matrix = matrix @ scene_data.settings.global_matrix_inv
        if is_global:
            # In any case, pre-multiply the global matrix to get it in FBX global space!
            matrix = scene_data.settings.global_matrix @ matrix

        return matrix

    def fbx_object_tx(self, scene_data, rest=False, rot_euler_compat=None):
        """
        Generate object transform data (always in local space when possible).
        """
        matrix = self.fbx_object_matrix(scene_data, rest=rest)
        loc, rot, scale = matrix.decompose()
        matrix_rot = rot.to_matrix()
        # quat -> euler, we always use 'XYZ' order, use ref rotation if given.
        if rot_euler_compat is not None:
            rot = rot.to_euler('XYZ', rot_euler_compat)
        else:
            rot = rot.to_euler('XYZ')
        return loc, rot, scale, matrix, matrix_rot

    # #### _tag dependent...
    def get_is_object(self):
        return self._tag == 'OB'
    is_object = property(get_is_object)

    def get_is_dupli(self):
        return self._tag == 'DP'
    is_dupli = property(get_is_dupli)

    def get_is_bone(self):
        return self._tag == 'BO'
    is_bone = property(get_is_bone)

    def get_type(self):
        if self._tag in {'OB', 'DP'}:
            return self.bdata.type
        return ...
    type = property(get_type)

    def get_armature(self):
        if self._tag == 'BO':
            return ObjectWrapper(self._ref)
        return None
    armature = property(get_armature)

    def get_bones(self):
        if self._tag == 'OB' and self.bdata.type == 'ARMATURE':
            return (ObjectWrapper(bo, self.bdata) for bo in self.bdata.data.bones)
        return ()
    bones = property(get_bones)

    def get_material_slots(self):
        if self._tag in {'OB', 'DP'}:
            return self.bdata.material_slots
        return ()
    material_slots = property(get_material_slots)

    def is_deformed_by_armature(self, arm_obj):
        if not (self.is_object and self.type == 'MESH'):
            return False
        if self.parent == arm_obj and self.bdata.parent_type == 'ARMATURE':
            return True
        for mod in self.bdata.modifiers:
            if mod.type == 'ARMATURE' and mod.object in {arm_obj.bdata, arm_obj.bdata.proxy}:
                return True

    # #### Duplis...
    def dupli_list_gen(self, depsgraph):
        if self._tag == 'OB' and self.bdata.is_instancer:
            return (ObjectWrapper(dup) for dup in depsgraph.object_instances
                                       if dup.parent and ObjectWrapper(dup.parent.original) == self)
        return ()


def fbx_name_class(name, cls):
    return FBX_NAME_CLASS_SEP.join((name, cls))


# ##### Top-level FBX data container. #####

# Helper sub-container gathering all exporter settings related to media (texture files).
FBXExportSettingsMedia = namedtuple("FBXExportSettingsMedia", (
    "path_mode", "base_src", "base_dst", "subdir",
    "embed_textures", "copy_set", "embedded_set",
))

# Helper container gathering all exporter settings.
FBXExportSettings = namedtuple("FBXExportSettings", (
    "report", "to_axes", "global_matrix", "global_scale", "apply_unit_scale", "unit_scale",
    "bake_space_transform", "global_matrix_inv", "global_matrix_inv_transposed",
    "context_objects", "object_types", "use_mesh_modifiers", "use_mesh_modifiers_render",
    "mesh_smooth_type", "use_subsurf", "use_mesh_edges", "use_tspace",
    "armature_nodetype", "use_armature_deform_only", "add_leaf_bones",
    "bone_correction_matrix", "bone_correction_matrix_inv",
    "bake_anim", "bake_anim_use_all_bones", "bake_anim_use_nla_strips", "bake_anim_use_all_actions",
    "bake_anim_step", "bake_anim_simplify_factor", "bake_anim_force_startend_keying",
    "use_metadata", "media_settings", "use_custom_props",
))

# Helper container gathering some data we need multiple times:
#     * templates.
#     * settings, scene.
#     * objects.
#     * object data.
#     * skinning data (binding armature/mesh).
#     * animations.
FBXExportData = namedtuple("FBXExportData", (
    "templates", "templates_users", "connections",
    "settings", "scene", "depsgraph", "objects", "animations", "animated", "frame_start", "frame_end",
    "data_empties", "data_lights", "data_cameras", "data_meshes", "mesh_material_indices",
    "data_bones", "data_leaf_bones", "data_deformers_skin", "data_deformers_shape",
    "data_world", "data_materials", "data_textures", "data_videos",
))

# Helper container gathering all importer settings.
FBXImportSettings = namedtuple("FBXImportSettings", (
    "report", "to_axes", "global_matrix", "global_scale",
    "bake_space_transform", "global_matrix_inv", "global_matrix_inv_transposed",
    "use_custom_normals", "use_image_search",
    "use_alpha_decals", "decal_offset",
    "use_anim", "anim_offset",
    "use_subsurf",
    "use_custom_props", "use_custom_props_enum_as_string",
    "nodal_material_wrap_map", "image_cache",
    "ignore_leaf_bones", "force_connect_children", "automatic_bone_orientation", "bone_correction_matrix",
    "use_prepost_rot",
))