__init__.py

# ##### BEGIN GPL LICENSE BLOCK #####
#
#  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 2
#  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.
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#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# ##### END GPL LICENSE BLOCK #####

# <pep8-80 compliant>

bl_info = {
    "name": "Wavefront OBJ format",
    "author": "Campbell Barton, Bastien Montagne",
    "version": (3, 5, 2),
    "blender": (2, 80, 0),
    "location": "File > Import-Export",
    "description": "Import-Export OBJ, Import OBJ mesh, UV's, materials and textures",
    "warning": "",
    "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/Wavefront_OBJ",
    "support": 'OFFICIAL',
    "category": "Import-Export"}

if "bpy" in locals():
    import importlib
    if "import_obj" in locals():
        importlib.reload(import_obj)
    if "export_obj" in locals():
        importlib.reload(export_obj)


import bpy
from bpy.props import (
        BoolProperty,
        FloatProperty,
        StringProperty,
        EnumProperty,
        )
from bpy_extras.io_utils import (
        ImportHelper,
        ExportHelper,
        orientation_helper,
        path_reference_mode,
        axis_conversion,
        )


@orientation_helper(axis_forward='-Z', axis_up='Y')
class ImportOBJ(bpy.types.Operator, ImportHelper):
    """Load a Wavefront OBJ File"""
    bl_idname = "import_scene.obj"
    bl_label = "Import OBJ"
    bl_options = {'PRESET', 'UNDO'}

    filename_ext = ".obj"
    filter_glob: StringProperty(
            default="*.obj;*.mtl",
            options={'HIDDEN'},
            )

    use_edges: BoolProperty(
            name="Lines",
            description="Import lines and faces with 2 verts as edge",
            default=True,
            )
    use_smooth_groups: BoolProperty(
            name="Smooth Groups",
            description="Surround smooth groups by sharp edges",
            default=True,
            )

    use_split_objects: BoolProperty(
            name="Object",
            description="Import OBJ Objects into Blender Objects",
            default=True,
            )
    use_split_groups: BoolProperty(
            name="Group",
            description="Import OBJ Groups into Blender Objects",
            default=True,
            )

    use_groups_as_vgroups: BoolProperty(
            name="Poly Groups",
            description="Import OBJ groups as vertex groups",
            default=False,
            )

    use_image_search: BoolProperty(
            name="Image Search",
            description="Search subdirs for any associated images "
                        "(Warning, may be slow)",
            default=True,
            )

    split_mode: EnumProperty(
            name="Split",
            items=(('ON', "Split", "Split geometry, omits unused verts"),
                   ('OFF', "Keep Vert Order", "Keep vertex order from file"),
                   ),
            )

    global_clight_size: FloatProperty(
            name="Clamp Size",
            description="Clamp bounds under this value (zero to disable)",
            min=0.0, max=1000.0,
            soft_min=0.0, soft_max=1000.0,
            default=0.0,
            )

    def execute(self, context):
        # print("Selected: " + context.active_object.name)
        from . import import_obj

        if self.split_mode == 'OFF':
            self.use_split_objects = False
            self.use_split_groups = False
        else:
            self.use_groups_as_vgroups = False

        keywords = self.as_keywords(ignore=("axis_forward",
                                            "axis_up",
                                            "filter_glob",
                                            "split_mode",
                                            ))

        global_matrix = axis_conversion(from_forward=self.axis_forward,
                                        from_up=self.axis_up,
                                        ).to_4x4()
        keywords["global_matrix"] = global_matrix

        if bpy.data.is_saved and context.user_preferences.filepaths.use_relative_paths:
            import os
            keywords["relpath"] = os.path.dirname(bpy.data.filepath)

        return import_obj.load(context, **keywords)

    def draw(self, context):
        layout = self.layout

        row = layout.row(align=True)
        row.prop(self, "use_smooth_groups")
        row.prop(self, "use_edges")

        box = layout.box()
        row = box.row()
        row.prop(self, "split_mode", expand=True)

        row = box.row()
        if self.split_mode == 'ON':
            row.label(text="Split by:")
            row.prop(self, "use_split_objects")
            row.prop(self, "use_split_groups")
        else:
            row.prop(self, "use_groups_as_vgroups")

        row = layout.split(factor=0.67)
        row.prop(self, "global_clight_size")
        layout.prop(self, "axis_forward")
        layout.prop(self, "axis_up")

        layout.prop(self, "use_image_search")


@orientation_helper(axis_forward='-Z', axis_up='Y')
class ExportOBJ(bpy.types.Operator, ExportHelper):
    """Save a Wavefront OBJ File"""

    bl_idname = "export_scene.obj"
    bl_label = 'Export OBJ'
    bl_options = {'PRESET'}

    filename_ext = ".obj"
    filter_glob: StringProperty(
            default="*.obj;*.mtl",
            options={'HIDDEN'},
            )

    # context group
    use_selection: BoolProperty(
            name="Selection Only",
            description="Export selected objects only",
            default=False,
            )
    use_animation: BoolProperty(
            name="Animation",
            description="Write out an OBJ for each frame",
            default=False,
            )

    # object group
    use_mesh_modifiers: BoolProperty(
            name="Apply Modifiers",
            description="Apply modifiers",
            default=True,
            )
    use_mesh_modifiers_render: BoolProperty(
            name="Use Modifiers Render Settings",
            description="Use render settings when applying modifiers to mesh objects",
            default=False,
            )

    # extra data group
    use_edges: BoolProperty(
            name="Include Edges",
            description="",
            default=True,
            )
    use_smooth_groups: BoolProperty(
            name="Smooth Groups",
            description="Write sharp edges as smooth groups",
            default=False,
            )
    use_smooth_groups_bitflags: BoolProperty(
            name="Bitflag Smooth Groups",
            description="Same as 'Smooth Groups', but generate smooth groups IDs as bitflags "
                        "(produces at most 32 different smooth groups, usually much less)",
            default=False,
            )
    use_normals: BoolProperty(
            name="Write Normals",
            description="Export one normal per vertex and per face, to represent flat faces and sharp edges",
            default=True,
            )
    use_uvs: BoolProperty(
            name="Include UVs",
            description="Write out the active UV coordinates",
            default=True,
            )
    use_materials: BoolProperty(
            name="Write Materials",
            description="Write out the MTL file",
            default=True,
            )
    use_triangles: BoolProperty(
            name="Triangulate Faces",
            description="Convert all faces to triangles",
            default=False,
            )
    use_nurbs: BoolProperty(
            name="Write Nurbs",
            description="Write nurbs curves as OBJ nurbs rather than "
                        "converting to geometry",
            default=False,
            )
    use_vertex_groups: BoolProperty(
            name="Polygroups",
            description="",
            default=False,
            )

    # grouping group
    use_blen_objects: BoolProperty(
            name="Objects as OBJ Objects",
            description="",
            default=True,
            )
    group_by_object: BoolProperty(
            name="Objects as OBJ Groups ",
            description="",
            default=False,
            )
    group_by_material: BoolProperty(
            name="Material Groups",
            description="",
            default=False,
            )
    keep_vertex_order: BoolProperty(
            name="Keep Vertex Order",
            description="",
            default=False,
            )

    global_scale: FloatProperty(
            name="Scale",
            min=0.01, max=1000.0,
            default=1.0,
            )

    path_mode: path_reference_mode

    check_extension = True

    def execute(self, context):
        from . import export_obj

        from mathutils import Matrix
        keywords = self.as_keywords(ignore=("axis_forward",
                                            "axis_up",
                                            "global_scale",
                                            "check_existing",
                                            "filter_glob",
                                            ))

        global_matrix = (Matrix.Scale(self.global_scale, 4) @
                         axis_conversion(to_forward=self.axis_forward,
                                         to_up=self.axis_up,
                                         ).to_4x4())

        keywords["global_matrix"] = global_matrix
        return export_obj.save(context, **keywords)


def menu_func_import(self, context):
    self.layout.operator(ImportOBJ.bl_idname, text="Wavefront (.obj)")


def menu_func_export(self, context):
    self.layout.operator(ExportOBJ.bl_idname, text="Wavefront (.obj)")


classes = (
    ImportOBJ,
    ExportOBJ,
)


def register():
    for cls in classes:
        bpy.utils.register_class(cls)

    bpy.types.TOPBAR_MT_file_import.append(menu_func_import)
    bpy.types.TOPBAR_MT_file_export.append(menu_func_export)


def unregister():
    bpy.types.TOPBAR_MT_file_import.remove(menu_func_import)
    bpy.types.TOPBAR_MT_file_export.remove(menu_func_export)

    for cls in classes:
        bpy.utils.unregister_class(cls)


if __name__ == "__main__":
    register()