Hi Mark, you can find the scripts for that here:
http://moi3d.com/forum/messages.php?webtag=MOI&msg=2888.11


> I would like Moi to put a point on the start point of a curve if it fails to
> create a planar surface because of an open curve.

It would be difficult to make it do this automatically because it's not necessarily an error to extrude open curves, sometimes it's normal to extrude a line or an arc curve for example that is not closed. If MoI were to make point objects all the time on every open curve extrusion then they could possibly accumulate all over the place and be annoying to remove if someone had actually meant to be extruding open curves.


But at some point I do want to add in a kind of "closed curve checker" tool which could help to analyze a curve that is supposed to be closed and planar and tell you if it is not either of those. Right now that MarkOpenCurveStart command from the above link can do the job to show you where the curve is not closed though.

- Michael