"No edge has more than 2 cells. Are cells listed twice?" Error. Possibly due to non-manifold mesh?

meshpro / optimesh

:spider_web: Mesh optimization, mesh smoothing.

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"No edge has more than 2 cells. Are cells listed twice?" Error. Possibly due to non-manifold mesh? #40

Closed Cascades closed 5 years ago

Cascades commented 5 years ago

I saw another issue (#27 ) which talked about the problem. I found this problem when running the software with an stl file as input... I suspect that it is due to my mesh being non-manifold. It happened on every method I ran with.

I'd love to attach a sample.. but not entirely sure I can :/ sorry about that... Basically wondering if manifold geometry is required?

Thanks

nschloe commented 5 years ago

What do you mean by "non-manifold"? I only know manifolds from topology, and there are no flat 2D regions which aren't manifolds, so it's a bit confusing to me.

Cascades commented 5 years ago

Sorry, what you are thinking of is what I'm thinking of, from topology. Is the project only for 2D meshes? I may have misunderstood.

nschloe commented 5 years ago

2D triangular meshes, to be precise. It may support tets at some point.

krober10nd commented 4 years ago

A mesh certainly can be non-manifold

https://pages.mtu.edu/~shene/COURSES/cs3621/SLIDES/Mesh.pdf

I actually ran into the same error as the original poster but it's not immediately clear what's incorrect with the mesh or how to fix it.

nschloe commented 4 years ago

I'll update the readme to say "manifold".