/// <summary>
/// Calculates the brightness falloff similar to the default falloff, but far smoother.
/// Slightly heavier on computation however.
/// </summary>
/// <param name="falloffRate">The falloff rate to use.</param>
/// <param name="cell">The cell where falloff is being computed.</param>
/// <param name="origin">The light origin cell.</param>
/// <returns>The brightness at that location from 0 to 1.</returns>
public static float GetSmoothFalloff(float falloffRate, int cell, int origin)
{
Vector2I newCell = Grid.CellToXY(cell), start = Grid.CellToXY(origin);
return(1.0f / Math.Max(1.0f, falloffRate * PUtil.Distance(start.X, start.Y,
newCell.X, newCell.Y)));
}