Optional ReadonlycountEntries from start, as a draw range's count (clamped to the entries there are). Default all.
Optional ReadonlyindicesVertex per entry; omit and entry i is vertex i.
Readonlypositionsx, y, z per vertex.
Optional ReadonlystartFirst entry, as a draw range's start. Default 0.
Points (or the vertices of segments) as three draws them: positions, an optional index and a range of entries.