Rhino ExtrudeCrv

Does anybody know why the extrudeCrv of these two extruding it empty??
I want it to be solid with no holes

if you used the option solid and it still does not work you might want to post a file.
by the way beautiful moiré.

Hi Yehuda - if the curve is closed and planar then the Solid=Yes command line option in ExtrudeCrv should make a closed object. If it is not closed or not planar, you can’t get a closed solid from ExtrudeCrv


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