FA-88762 / Mesh topology invariants / Member archive

UV face lists of the wrong length are paired silently · case 02

A short UV list is wrapped around the face and invents seams.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input [faces, uvfaces]: each face has a parallel list of UV indices. A face whose UV list length differs returns ["uv-mismatch", face index]. A geometric edge is a seam when a later face assigns a different UV index to either endpoint than the first face did. Return sorted seam edges [min,max].

Why this case matters

Mesh processing pipelines (remeshing, export, simulation, printing) trust these topological counts and adjacency answers; a wrong invariant silently accepts broken meshes or rejects valid ones.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
extra uv corner	`[]`	`["uv-mismatch", 0]`	Failed

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