the export output to left handed (+Z, Yup) is wrong: The X axis is flipped which causes the objects to be mirrored horizontally!
Only workaround would be to scale the object(s) x -1, then flip the normals for each object before any joinning! Not practicall at all!
Also, it cannot be post corrected externally simply by reversing back the X axis, because it is tied to the way normals were calculated. In other words, this export is useless!
So, two options remain:
a) is there by chance someone capable/willing to correct this python addon?
b) since (a) might take a lot of time, is there an external (free) app to convert Blender’s output (e.g 3ds or other correct export -if any) to correct +Z Yup OBJ? Anyone tried this before?