SubD from Mesh flipping random faces

This is driving me crazy and I can’t figure it out. Anyone know why some faces are randomly flipping when using the SubD from Mesh?

Alternatively, any ideas how to rectify the flipping? I’ve tried many things and none of them work.

Thanks
Tim
Rhino 7SR36

meshToSubD.gh (8.4 KB)

Works fine on Rhino 8.4. Maybe flipping the curves with a guide curve, helps?



meshToSubD_2.gh (17.5 KB)

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@Tim_Williams

As @kossatz points out, R8 seems to address this. It happens often. I’d flip the curves, and if that doesn’t help then a workaround is to offset both directions, sort them and pick interior or exterior offset:
meshToSubD.gh (9.1 KB)

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Good to know it has been fixed!

And yes, your solution also works in 7, thanks!

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Great fix!

1 Like