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A *manifold*
is a topological space that on a small
enough scale resembles Euclidean space of a given dimension.

A mesh is a two-manifold if:

Common non-manifold features include surface handles and gaps.

A mesh is a two-manifold if:

- For a (non-boundary) vertex, the 1-ring neighbour vertices form a simple chain.
- Each edge is shared by at most two faces.

Common non-manifold features include surface handles and gaps.

High

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