public AltNoise(long seed, double scalex, double scaley, double scalez) {
this.scalex = 1.0 / scalex;
this.scaley = 1.0 / scaley;
this.scalez = 1.0 / scalez;
this.seed = seed;
this.rand = new Random(seed);
this.samples = new Vector3[256];
for (int i = 0; i < this.samples.length; i++) {
this.samples[i] = Vector3.randomUnitVector(this.rand);
}
}
private double gradNoise(double fx, double fy, double fz, int ix, int iy, int iz) {
Vector3 grad = this.grad(ix, iy, iz);
Vector3 point = new Vector3(fx - ix, fy - iy, fz - iz);
return grad.dot(point) * 2.12;
}