/// <summary>
/// Returns the passed BlockType array with the passed PlanetStratum layered onto it.
/// </summary>
/// <param name="noise">Noise used to calculate stratum blocks</param>
/// <param name="stratum">PlanetStratum to generate blocks from</param>
/// <param name="planet">BlockType array to layer onto</param>
/// <param name="padding">How much padding on outsides to leave</param>
/// <returns>BlockType Array with PlanetStratum layer added</returns>
static BlockData[,,] LayerStratumOnPlanet(FastNoise noise, PlanetStratum stratum, BlockData[,,] planet, int padding)
{
BlockData[,,] layeredPlanet = planet;
int planetSize = planet.GetLength(0);
int innerBound = padding + stratum.size;
int outerBound = planetSize - innerBound;
for (int x = padding; x < planetSize - padding; x++)
{
for (int y = padding; y < planetSize - padding; y++)
{
for (int z = padding; z < planetSize - padding; z++)
{
if (planet[x, y, z] == null)
{
BlockData data = CalculateBlockFromPlanetStratum(noise, stratum, x, y, z);
layeredPlanet[x, y, z] = data;
}
}
}
}
return(layeredPlanet);
}
/// <summary>
/// Calculates what BlockType should exist at given coordinate in planet, based on the passed Plenet Stratum
/// </summary>
/// <param name="noise">Noise generator to use for calculation</param>
/// <param name="s">PlanetStratum to use for calculation</param>
/// <param name="x">Planet coordinate X</param>
/// <param name="y">Planet coordinate Y</param>
/// <param name="z">Planet coordinate Z</param>
/// <returns>BlockType given the planetstratum at the given coordinate</returns>
private static BlockData CalculateBlockFromPlanetStratum(FastNoise noise, PlanetStratum s, int x, int y, int z)
{
BlockData data = null;
noise.SetFrequency(1 / s.scale);
// Get noise in Range(-1f, 1f)
float noiseVal = noise.GetSimplexFractal(x, y, z);
// Convert to Range(0f, 1f)
float e = (noiseVal + 1) / 2;
// Raise to strata power level
e = Mathf.Pow(e, s.power);
// Scale from e Range(0,1) to size of blockTypes array
int index = Mathf.FloorToInt(e * s.blockDistribution.Length);
// Set to type at that index in array
data = s.blockDistribution[index];
return(data);
}
