In my previous post I described a bug where, when we have a split vertex in an apt.dat layout, X-Plane would draw taxiway lights all over the place. Fortunately, there is a workaround.
Remember that a split vertex is represented as two or three colocated vertices with one or two zero-length segments connecting them. The bug is that zero-length segments cause lights and lines to go haywire.
The fix is therefore simple:
- Programs that write apt.dat files can simply set the attributes on the zero-length segment to none.
- Future versions of X-Plane (with a real bug fix) can join taxiway lines even when there is a zero-length “break” in the attributes.
This picture shows the results – a split vertex with no attributes on the zero-length segment.