I got a bunch of polylines that I'm trying to wrangle. I'm using detail mode and half edges to step through the points, it works fine when starting at the first vertex but if I want to reverse the order there doesn't seem to be any vex functions for me. There's only functions to get a half edges if you got the “source” point/vertex, not the “destination”.

Or am I missing something?

I think I work around this by reversing the curves and forward process them, then reverse again but I probably can't do that in a generic solution.