SQOTD: Dude, Where's my Corridor?

Q: "I have sample lines and section views in my project. I went to extend my sample line to get more of the existing surface in the view, but then my corridor disappeared from my section view. What happened?"

A. This fellow accidentally skewed one side when he grip-edited the sample line. If you grip edit a sample line and it is no longer perpendicular to the alignment, you will no longer see your corridor in the section view. This happens for a reason: kinky stations don't get included in end-area volume calcs.

To extend the sample line without skewing it, use the triangular grip. The square grip will let you move it wherever you wish - including out of line with the other side of the sample line.

You can fix it by selecting the sample line that is out of whack, right-click and select Make Orthogonal. This forces both sides back to perpendicular to the alignment. Then you're corridor will show up in the section views again.