Using ConvertPts on the point output shows the correct right hand point. (The "inverted" point.)

The vector displayed for the inverted point does seem to be incorrect. I'm investigating the code, which seems very difficult for my brain to understand :-)

- Brian

In the vector.js code, line 31 creates the vectors, using orient_line_to_line. line 287 codes for the incorrect inverted vector.
this and that do not make sense to me...