Non Manifold Geometry Explained - Blender 3D.

[@andrey730]

What I've found looking for some clear defintiion, it seems the correct one would be "each edge should have exactly 2 faces and geometry should have a thickness". E.g. imagine icosphere with a removed face - edges around the hole will have just 1 face to them. And the thickness property would explain why mobius strip is non-manifold.

[@dyotoorion1835]

That is also correct and a good definition. Thanks! :-)

[@frenkyb123]

Very good explanation, thanks a lot.

[@dyotoorion1835]

Cheers! :-)

[@ianh0628]

Thanks, a very nice explanation of the definition of non manifold, which is missing in many video of the same topics. You definitely deserve more likes.

[@dyotoorion1835]

Cheers! :-)

[@Punditty]

Your explanation really helped. Thank you.

[@oscarblanco1303]

Thank you very much! beautiful explanation

[@dyotoorion1835]

My pleasure. :-) Glad you found it helpful!

[@cinemauntold]

RIGHT

[@MattVarner]

In another life, I'd love to deep-dive into mathematical concepts more than I got around to in this one. Right now, at 52, and hobby-editing my dumb little project...I just need to know the brain-fart I'm committing while trying to force a face between two admittedly different kinds of edge loops, and whether the reason I'm stuck is whether I'm committing a crime against math or not. Appreciate the warning, however.

[@dyotoorion1835]

Hehe. Don't worry I'm not an expert on Topological Math either. :P

[@hjvhjfv6320]

Slightly unclear what "the correct direction" is supposed to be

[@dyotoorion1835]

There is no "correct direction" per se. It's just having all faces pointing in a consistent direction. :-) The direction you want them all to face. The problem with a "Non-Manifold" Geometry is that it's geometry that cannot have consistent face direction. I hope that clarifies.

[@AshiqAli-te7tr]

Thank you for the explanation mate.

[@dyotoorion1835]

@@AshiqAli-te7tr Cheers! :-)

[@MccZerk]

Your defintion of Manifold to be something we want or rational geometry was not helpful in the slightest.

[@dyotoorion1835]

If a person states that they do not like something, but do not give a proper explanation as to why they do not like it, it is really just saying something about themselves, rather than any actual criticism of the thing itself.

[@shanel104]

​@@dyotoorion1835sounds like the non manifolds got the better of him 😅 my model has 30,000 help!!!