I'm using the wavefront obj export script. I needed to export objects using local object coordinates instead of global world coordinates.

I modded the official export script and added a checkbox for this.

I don't have previous experience with blender coding, and frankly I don't have the time to investigate how to make a proper patch. So I'll just put this out here if someone else is having the same problem (or some developer checks if I did something crazy stupid).

(Also I'm mainly posting because I googled a bit to solve the problem, only to find out that someone already made this for himself. He just didn't bother publishing the solution)

Here's a diff off the changes I made (I was using the script from 2.63):

Code:

--- __init__.py   Tue Jan 20 00:26:12 1970 +++ __init__.py   Tue Jan 20 00:26:12 1970 @@ -287,6 +287,12 @@              default=False,              )   +    use_object_coordinates = BoolProperty( +            name="Use Object Coordinates", +            description="", +            default=False, +            ) +      global_scale = FloatProperty(              name="Scale",              description="Scale all data", --- export_obj.py   Tue Jan 20 00:26:12 1970 +++ export_obj.py   Tue Jan 20 00:26:12 1970 @@ -228,6 +228,7 @@                 EXPORT_CURVE_AS_NURBS=True,                 EXPORT_GLOBAL_MATRIX=None,                 EXPORT_PATH_MODE='AUTO', +               EXPORT_OBJECT_COORDINATES=False,                 ):      '''      Basic write function. The context and options must be already set @@ -320,7 +321,11 @@                # Nurbs curve support              if EXPORT_CURVE_AS_NURBS and test_nurbs_compat(ob): -                ob_mat = EXPORT_GLOBAL_MATRIX * ob_mat +                if EXPORT_OBJECT_COORDINATES: +                    ob_mat = EXPORT_GLOBAL_MATRIX +                else: +                    ob_mat = EXPORT_GLOBAL_MATRIX * ob_mat +                  totverts += write_nurb(fw, ob, ob_mat)                  continue              # END NURBS @@ -333,7 +338,11 @@              if me is None:                  continue   -            me.transform(EXPORT_GLOBAL_MATRIX * ob_mat) +            if EXPORT_OBJECT_COORDINATES: +                me.transform(EXPORT_GLOBAL_MATRIX) +            else: +                me.transform(EXPORT_GLOBAL_MATRIX * ob_mat) +                           if EXPORT_UV:                  faceuv = len(me.uv_textures) > 0 @@ -626,6 +635,7 @@                EXPORT_ANIMATION,                EXPORT_GLOBAL_MATRIX,                EXPORT_PATH_MODE, +              EXPORT_OBJECT_COORDINATES,                ):  # Not used        base_name, ext = os.path.splitext(filepath) @@ -675,6 +685,7 @@                     EXPORT_CURVE_AS_NURBS,                     EXPORT_GLOBAL_MATRIX,                     EXPORT_PATH_MODE, +                   EXPORT_OBJECT_COORDINATES,                     )        scene.frame_set(orig_frame, 0.0) @@ -707,7 +718,8 @@           use_selection=True,           use_animation=False,           global_matrix=None, -         path_mode='AUTO' +         path_mode='AUTO', +         use_object_coordinates=False           ):        _write(context, filepath, @@ -727,6 +739,7 @@             EXPORT_ANIMATION=use_animation,             EXPORT_GLOBAL_MATRIX=global_matrix,             EXPORT_PATH_MODE=path_mode, +           EXPORT_OBJECT_COORDINATES=use_object_coordinates             )        return {'FINISHED'}