/// <summary>
///
/// </summary>
/// <param name="config"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static float CubicNoiseSample2D(CubicNoiseConfig config,
float x,
float y)
{
int xi = (int)Math.Floor(x / config.Octave);
float lerpX = x / config.Octave - xi;
int yi = (int)Math.Floor(y / config.Octave);
float lerpY = y / config.Octave - yi;
float[] xSamples = new float[4];
for (int i = 0; i < 4; i++)
{
xSamples[i] = CubicNoiseInterpolate(CubicNoiseRandom(config.Seed,
CubicNoiseTile(xi - 1, config.PeriodX),
CubicNoiseTile(yi - 1 + i, config.PeriodY)),
CubicNoiseRandom(config.Seed,
CubicNoiseTile(xi, config.PeriodX),
CubicNoiseTile(yi - 1 + i, config.PeriodY)),
CubicNoiseRandom(config.Seed,
CubicNoiseTile(xi + 1, config.PeriodX),
CubicNoiseTile(yi - 1 + i, config.PeriodY)),
CubicNoiseRandom(config.Seed,
CubicNoiseTile(xi + 2, config.PeriodX),
CubicNoiseTile(yi - 1 + i, config.PeriodY)),
lerpX);
}
return(CubicNoiseInterpolate(xSamples[0],
xSamples[1],
xSamples[2],
xSamples[3],
lerpY) * 0.5f + 0.25f);
}
/// <summary>
///
/// </summary>
/// <param name="config"></param>
/// <param name="x"></param>
/// <returns></returns>
public static float CubicNoiseSample1D(CubicNoiseConfig config,
float x)
{
int xi = (int)(x / config.Octave);
float lerp = x / config.Octave - xi;
return(CubicNoiseInterpolate(CubicNoiseRandom(config.Seed, CubicNoiseTile(xi - 1, config.PeriodX), 0),
CubicNoiseRandom(config.Seed, CubicNoiseTile(xi, config.PeriodX), 0),
CubicNoiseRandom(config.Seed, CubicNoiseTile(xi + 1, config.PeriodX), 0),
CubicNoiseRandom(config.Seed, CubicNoiseTile(xi + 2, config.PeriodX), 0),
lerp) * 0.5f + 0.25f);
}
/// <summary>
///
/// </summary>
/// <param name="seed"></param>
/// <param name="octave"></param>
/// <param name="period"></param>
/// <returns></returns>
public static CubicNoiseConfig CubicNoiseConfig1D(uint seed,
int octave,
int period)
{
CubicNoiseConfig config = new CubicNoiseConfig();
config.Seed = seed;
config.Octave = octave;
config.PeriodX = period / octave;
return(config);
}
