Why Solid Difference is not working?

why solid difference not working herer.gh (12.4 KB)

I guess these are simple geometries, but it failed.
I like to understand why.
My document tolerance is 0.001.
Thanks!

Oh, I get it.
The upper one’s surfaces have the wrong normal directions.
Is there any way I can flip the surface N direction without deconstructing the Brep?

this will solve the issue

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Thank you!

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Most likely, the first object was created with a revolution and the section curve was going into the opposite direction than the axis.

why solid difference not working herer.gh (22.6 KB)

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Wow! It was indeed created by revolution! Thanks!

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