> For these four vertices, vgl_polygon_scan_iterator failed to properly fill
> the polygon.
> 424 785.99975
> 426 786.00012
> 426 789.91188
> 424 790.06225
> When y=786, it produced a very large value for xr.
I have partially solved this problem (the large values disappeared) but
it's still incorrect (the x values from 411 to 423 are still there).
> It worked on VXL version from 6/7/2003.
In the 6/7/03 version, essentially, the "no-boundary points" option
was in effect, at least in the vertical direction.
To more or less revert to the 6/7/03 behaviour, you may use the
vgl_polygon_scan_iterator constructor with "false" as second argument.
This solves the 411--423 problem as well.