public static double[] getFastNoise1D(
Noise noise, int xSize, int samplingRate, int x, int y, int z) {
if (samplingRate == 0) {
throw new IllegalArgumentException("samplingRate cannot be 0");
}
if (xSize % samplingRate != 0) {
throw new IllegalArgumentException("xSize % samplingRate must return 0");
}
double[] noiseArray = new double[xSize + 1];
for (int xx = 0; xx <= xSize; xx += samplingRate) {
noiseArray[xx] = noise.noise3D(xx + x, y, z);
}
for (int xx = 0; xx < xSize; ++xx) {
if (xx % samplingRate != 0) {
int nx = xx / samplingRate * samplingRate;
noiseArray[nx] =
Noise.linearLerp(
xx, nx, nx + samplingRate, noiseArray[nx], noiseArray[nx + samplingRate]);
}
}
return noiseArray;
}
