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);
}
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);
}
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);
}