Help I have some questions about the fabric

[josemendez]

Whether it can be understood as: whether the model itself is a perfect manifold geometry. Obi supports as long as the geometry can be flattened into a piece of cloth?

I have uploaded an attachment. I think this model should not satisfy Manifold Objects. Because I did a grid split of orders and edges. However, it can be simulated normally in OBI. So I'm conflicted about these two concepts

Hi,

I just inspected your mesh, and it's a perfect 2-manifold.

Asking blender to find non-manifold features only marks the outer edges and a few inner faces that are detached from the neighboring ones. This is because blender considers open edges to be non-manifold features (since Blender considers 2-manifolds need to also form a closed volume).

Other than the open edges (which most apps other than Blender won't consider non-manifold) there's no non-manifold features: no floating vertices, no edges shared by more than 2 faces, no adjacent faces with opposite winding order, no zero area faces, no zero length edges, etc. The mesh is perfectly fine as far as Obi is concerned.