protected void CheckPosition(Vector4 pos, out int n)
{
n = 0;
for (int x = -1; x <= 1; x++)
{
for (int y = -1; y <= 1; y++)
{
for (int z = -1; z <= 1; z++)
{
for (int w = -1; w <= 1; w++)
{
if (x == 0 && y == 0 && z == 0 && w == 0)
{
continue; // this is ourselves
}
var nPos = new Vector4(pos.X + x, pos.Y + y, pos.Z + z, pos.W + w);
if (ActiveCells.Contains(nPos))
{
n++;
}
}
}
}
}
}
public PocketDimension3d Next()
{
var minX = ActiveCells.Min(cell => cell.X);
var minY = ActiveCells.Min(cell => cell.Y);
var minZ = ActiveCells.Min(cell => cell.Z);
var maxX = ActiveCells.Max(cell => cell.X);
var maxY = ActiveCells.Max(cell => cell.Y);
var maxZ = ActiveCells.Max(cell => cell.Z);
var nextGenBuilder = ImmutableHashSet <Cell3d> .Empty.ToBuilder();
for (int x = minX - 1; x <= maxX + 1; x++)
{
for (int y = minY - 1; y <= maxY + 1; y++)
{
for (int z = minZ - 1; z <= maxZ + 1; z++)
{
var cell = new Cell3d(x, y, z);
var activeNeighboursCount = cell.GetNeighbours()
.Where(neighbour => ActiveCells.Contains(neighbour))
.Count();
var has2Neighbors = activeNeighboursCount == 2;
var has3Neighbors = activeNeighboursCount == 3;
var isActive = ActiveCells.Contains(cell);
if (isActive && (has2Neighbors || has3Neighbors))
{
// If a cube is active and exactly 2 or 3 of its neighbors are also active,
// the cube remains active. Otherwise, the cube becomes inactive.
nextGenBuilder.Add(cell);
}
else if (!isActive && has3Neighbors)
{
// If a cube is inactive but exactly 3 of its neighbors are active,
// the cube becomes active. Otherwise, the cube remains inactive.
nextGenBuilder.Add(cell);
}
}
}
}
return(new PocketDimension3d(nextGenBuilder.ToImmutable()));
}