Until Manifold obtains 3d viewing, there is simple way to look at vertical cross-sections of 3d points.

Either draw 1 line on [Section] drawing and open (refresh Ctrl-F5) [VerticalSection Drawing] or make a selection of Points and open [lookEW_Selection Drawing] or [lookNS_Selection Drawing].

The image explains it best.

Attachments:
m9_Vertical_Section.mxb
Vertical_Section.jpg

Small mistake in mxb.

In queries [lookEW_Selection] and [lookNS_Selection] replace [474658_2012] with [Points]

Wow! That's brilliant!

I'll echo that! What a great demonstration of the utility of M9 SQL and very useful to boot. Many thanks for sharing.