ExtrudeSrfTapered Polar Surface Problem/Bug

ExtrudeSrfTapered appears to have major problems if “polar” surfaces which is “closed”, (cover 360 degrees) is used as input. The problems include surfaces with a hole at the center as well as surfaces. A “polar” surface which is “open” and does not cover 360 degrees does not have these problems nor does a “rectangular” surface which is trimmed to the same shape. Problems occur with ExtrudeSrfTapered for both Solid=Yes and Solid=No.

ExtrudeSrf does not appear to have similar problems.

ExtrudeSrfTapered Bug DC11.3dm (919.9 KB)

Same problems exist in V5. I’m surprised this hasn’t been flagged previously.

Hi David - I see that, thanks.
https://mcneel.myjetbrains.com/youtrack/issue/RH-49649

-Pascal