import_obj.py

            material_libs = list(set(material_libs) | set(line.split()[1:]))  # can have multiple mtllib filenames per line, mtllib can appear more than once, so make sure only occurance of material exists

            # Nurbs support
        elif line_start == b'cstype':
            context_nurbs[b'cstype'] = line_value(line.split())  # 'rat bspline' / 'bspline'
        elif line_start == b'curv' or context_multi_line == b'curv':
            curv_idx = context_nurbs[b'curv_idx'] = context_nurbs.get(b'curv_idx', [])  # in case were multiline

            if not context_multi_line:
                context_nurbs[b'curv_range'] = float_func(line_split[1]), float_func(line_split[2])
                line_split[0:3] = []  # remove first 3 items

            if strip_slash(line_split):
                context_multi_line = b'curv'
            else:
                context_multi_line = b''

            for i in line_split:
                vert_loc_index = int(i) - 1

                if vert_loc_index < 0:
                    vert_loc_index = len(verts_loc) + vert_loc_index + 1

                curv_idx.append(vert_loc_index)

        elif line_start == b'parm' or context_multi_line == b'parm':
            if context_multi_line:
                context_multi_line = b''
            else:
                context_parm = line_split[1]
                line_split[0:2] = []  # remove first 2

            if strip_slash(line_split):
                context_multi_line = b'parm'
            else:
                context_multi_line = b''

            if context_parm.lower() == b'u':
                context_nurbs.setdefault(b'parm_u', []).extend([float_func(f) for f in line_split])
            elif context_parm.lower() == b'v':  # surfaces not supported yet
                context_nurbs.setdefault(b'parm_v', []).extend([float_func(f) for f in line_split])
            # else: # may want to support other parm's ?

        elif line_start == b'deg':
            context_nurbs[b'deg'] = [int(i) for i in line.split()[1:]]
        elif line_start == b'end':
            # Add the nurbs curve
            if context_object:
                context_nurbs[b'name'] = context_object
            nurbs.append(context_nurbs)
            context_nurbs = {}
            context_parm = b''

        ''' # How to use usemap? depricated?
        elif line_start == b'usema': # usemap or usemat
            context_image= line_value(line_split)
        '''

    file.close()
    time_new = time.time()
    print("%.4f sec" % (time_new - time_sub))
    time_sub = time_new

    print('\tloading materials and images...')
    create_materials(filepath, material_libs, unique_materials, unique_material_images, use_image_search)

    time_new = time.time()
    print("%.4f sec" % (time_new - time_sub))
    time_sub = time_new

    # deselect all
    if bpy.ops.object.select_all.poll():
        bpy.ops.object.select_all(action='DESELECT')

    scene = context.scene
#     scn.objects.selected = []
    new_objects = []  # put new objects here

    print('\tbuilding geometry...\n\tverts:%i faces:%i materials: %i smoothgroups:%i ...' % (len(verts_loc), len(faces), len(unique_materials), len(unique_smooth_groups)))
    # Split the mesh by objects/materials, may
    if use_split_objects or use_split_groups:
        SPLIT_OB_OR_GROUP = True
    else:
        SPLIT_OB_OR_GROUP = False

    for verts_loc_split, faces_split, unique_materials_split, dataname in split_mesh(verts_loc, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP):
        # Create meshes from the data, warning 'vertex_groups' wont support splitting
        create_mesh(new_objects,
                    has_ngons,
                    use_ngons,
                    use_edges,
                    verts_loc_split,
                    verts_tex,
                    faces_split,
                    unique_materials_split,
                    unique_material_images,
                    unique_smooth_groups,
                    vertex_groups,
                    dataname,
                    )

    # nurbs support
    for context_nurbs in nurbs:
        create_nurbs(context_nurbs, verts_loc, new_objects)

    # Create new obj
    for obj in new_objects:
        base = scene.objects.link(obj)
        base.select = True

        # we could apply this anywhere before scaling.
        obj.matrix_world = global_matrix

    scene.update()

    axis_min = [1000000000] * 3
    axis_max = [-1000000000] * 3

    if global_clamp_size:
        # Get all object bounds
        for ob in new_objects:
            for v in ob.bound_box:
                for axis, value in enumerate(v):
                    if axis_min[axis] > value:
                        axis_min[axis] = value
                    if axis_max[axis] < value:
                        axis_max[axis] = value

        # Scale objects
        max_axis = max(axis_max[0] - axis_min[0], axis_max[1] - axis_min[1], axis_max[2] - axis_min[2])
        scale = 1.0

        while global_clamp_size < max_axis * scale:
            scale = scale / 10.0

        for obj in new_objects:
            obj.scale = scale, scale, scale

    time_new = time.time()

    print("finished importing: %r in %.4f sec." % (filepath, (time_new - time_main)))
    return {'FINISHED'}


# NOTES (all line numbers refer to 2.4x import_obj.py, not this file)
# check later: line 489
# can convert now: edge flags, edges: lines 508-528
# ngon (uses python module BPyMesh): 384-414
# NEXT clamp size: get bound box with RNA
# get back to l 140 (here)
# search image in bpy.config.textureDir - load_image
# replaced BPyImage.comprehensiveImageLoad with a simplified version that only checks additional directory specified, but doesn't search dirs recursively (obj_image_load)
# bitmask won't work? - 132
# uses bpy.sys.time()