Closed/complex polysurfaces not displaying as such

Rhino Rhino for Windows
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I’ve run into this a few times recently, where closed (or complex) polysurface doesn’t show up in a Ghosted/shaded viewport.

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The isolines are present, just not the shading:

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RHINO/SYSTEM INFORMATION:

Rhino 7 SR14 2022-1-10 (Rhino 7, 7.14.22010.17001, Git hash:master @ d8a2d020be8cb487bfc091316ef32170cfc7eddb)

Windows 10.0.19044 SR0.0 or greater (Physical RAM: 32Gb)

Computer platform: DESKTOP

Standard graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 2080 Ti (NVidia) Memory: 11GB, Driver date: 10-26-2021 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 472.47
> Accelerated graphics device with 4 adapter port(s)
- Windows Main Display attached to adapter port #0
- Secondary monitor attached to adapter port #10

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Hello- most likely, the outline has one or more self intersections - you can usually find these by turning on the curvarure graph ( CurvatureGraph command, at a low scale) and looking for the remaining spikes in the graph. Feel free to post the model too, I’ll have a look.

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ooh…good idea. I think you’re on to something.

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If you ever think Pascal is wrong, you’re mistaken…

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Your check is in the mail.

-Pascal

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Classic. Solved the problem - thank you much Pascal!