FA-88567 / Mesh topology invariants / Member archive

Compaction keeps vertices referenced only by dropped faces · case 02

Orphan vertices from discarded degenerate faces remain in the output.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input [verts, faces]: drop faces with fewer than 3 distinct vertices, then keep only vertices referenced by remaining faces, renumbered 0-based in increasing old-index order. Faces keep their corner order. Return [kept vertex payloads, remapped faces].

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
only degenerate	`[["x", "y", "z"], []]`	`[[], []]`	Failed

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