The ObjectBuilder program has a function to recalculate the normals (F5 key) that is not available any other way. For exporters from other programs (for example Blender) that have a different normal concept it would be very handy to have this as a script command, so that simply loading the model with O2script.exe and using this function could be done explicitly to normalize the normals.

As it is now, apparently sometimes it recalculates the normals upon a simple load-save cycle, but not reliably.