Function _moveSlot

js/decimation.js:311–319

(s, nv, vfHead, slotNext, slotPrev, slotVert)

}

// ── Linked-list vertex-face incidence ────────────────────────────────────────
// Replaces the old Array<Set<number>> adjacency.  For each face f and vertex
// position k, slot s = f*3+k tracks face f in vertex v = faces[f*3+k]'s list.
//
//   vfHead[v]       → first slot for vertex v  (-1 = empty)
//   slotFace[s]     → face tracked by slot s
//   slotVert[s]     → vertex that currently owns slot s
//   slotNext[s]     → next slot in vertex's list  (-1 = end)
//   slotPrev[s]     → prev slot in vertex's list  (-1 = head)
//   faceSlot[f*3+k] → slot for face f's k-th vertex incidence

function buildLinkedAdj(faces, faceCount, vertCount) {