Hi all, @theoutside , - here is a V5 plug-in
AutoCPlane.rhp (18 KB)
and script
AutoCPlane_01_07_15.py (8.6 KB)
with Giulio’s enhancements - the CPlane does not actually get changed until you release the mouse button, but the labels constantly update to tell you what the CPlane will be if you release now.
-Pascal