I created a curve that will not extrude planar to form a solid. I remade the curve to be certain that I did not make any mistakes, and it still will not extrude. Please take a look and tell me why it will not extrude.Problem Curve.3dm (27.1 KB)

The curve is open, not closed. For a curve to extrude and become a solid it must be a closed, planar curve.

Methods to determine if a curve is open or closed:

`What`

command and select the curve. What will report if the curve is open or closed.

`CrvSeam`

command. If the curve is not closed it will not be selectable for the CrvSeam command.

`CrvStart`

and `CrvEnd`

commands. Run both commands. If the closed the curve end and start points will **exactly** coincide. These commands are also useful for finding the reason a curve is open and not closed.

Additionally, if there are lots of curves, a quick way to find the open or closed ones is to use `SelOpenCrv`

and `SelClosedCrv`

.

-wim

Donâ€™t forget about `ShowEnds`

, yâ€™all. The ShowEdges for curves commandâ€¦

-Pascal

Help needs to be updated with ShowEnds is listed under â€śSee alsoâ€ť in the sections for CrvStart, CrvEnd and CrvSeam

I added CrvStart, CrvEnd, and CrvSeam to the see also section of the ShowEnds topic.

ShowEnds is also added to CrvStart, CrvEnd, and CrvSeam topics.

Thanks.