private HashSet <Vector2i> ChunkEdge(HashSet <Vector2i> cellsInBiome, CellInfoCom[,] cells, long edgeSeed)
{
var edges = new HashSet <Vector2i>();
foreach (var cell in cellsInBiome)
{
var adjacent = Utility.GetAdjacentSquares(cell.X, cell.Y, cells);
if (adjacent.Any(i => !cellsInBiome.Contains(i)))
{
var nextSeed = edgeSeed + (((cell.X * 1691275049) + (cell.Y * 76045141)) % 3153608179);
Utility.AddAll(edges, GrowEdge(cell, cellsInBiome, adjacent, cells, nextSeed));
}
}
return(edges);
}