Function S2Cell.fromFacePosLevel

Returns a cell given its face (range 0..5), Hilbert curve position within that face (an unsigned integer with S2CellId::kPosBits bits), and level (range 0..kMaxLevel). The given position will be modified to correspond to the Hilbert curve position at the center of the returned cell. This is a static function rather than a constructor in order to indicate what the arguments represent.

static S2Cell fromFacePosLevel (
  int face,
  ulong pos,
  int level
);