public float Noise(Vec3 vec)
{
var cube = vec.Floor();
var pt = vec - cube;
var faded = Fade(pt);
var X = (int)cube.X;
var Y = (int)cube.Y;
var Z = (int)cube.Z;
int A = Permutation(X) + Y,
AA = Permutation(A) + Z,
AB = Permutation(A + 1) + Z,
B = Permutation(X + 1) + Y,
BA = Permutation(B) + Z,
BB = Permutation(B + 1) + Z;
return(FMath.Mix(
FMath.Mix(
FMath.Mix(
Gradient(Permutation(AA), pt.X, pt.Y, pt.Z),
Gradient(Permutation(BA), pt.X - 1f, pt.Y, pt.Z),
faded.X),
FMath.Mix(
Gradient(Permutation(AB), pt.X, pt.Y - 1f, pt.Z),
Gradient(Permutation(BB), pt.X - 1f, pt.Y - 1f, pt.Z),
faded.X),
faded.Y),
FMath.Mix(
FMath.Mix(
Gradient(Permutation(AA + 1), pt.X, pt.Y, pt.Z - 1f),
Gradient(Permutation(BA + 1), pt.X - 1f, pt.Y, pt.Z - 1f),
faded.X),
FMath.Mix(
Gradient(Permutation(AB + 1), pt.X, pt.Y - 1f, pt.Z - 1f),
Gradient(Permutation(BB + 1), pt.X - 1f, pt.Y - 1f, pt.Z - 1f),
faded.X),
faded.Y),
faded.Z));
}
public float PeriodicNoise(Vec3 vec, Vec3 period)
{
var cube = vec.Floor();
var pt = vec - cube;
var faded = Fade(pt);
var iv = cube.Mod(period).Floor().ToVeci();
var jv = (cube + new Vec3(1f)).Mod(period).Floor().ToVeci();
int A = Permutation(iv.X),
AA = Permutation(A + iv.Y),
AB = Permutation(A + jv.Y),
B = Permutation(jv.X),
BA = Permutation(B + iv.Y),
BB = Permutation(B + jv.Y);
return(FMath.Mix(
FMath.Mix(
FMath.Mix(
Gradient(Permutation(AA + iv.Z), pt.X, pt.Y, pt.Z),
Gradient(Permutation(BA + iv.Z), pt.X - 1f, pt.Y, pt.Z),
faded.X),
FMath.Mix(
Gradient(Permutation(AB + iv.Z), pt.X, pt.Y - 1f, pt.Z),
Gradient(Permutation(BB + iv.Z), pt.X - 1f, pt.Y - 1f, pt.Z),
faded.X),
faded.Y),
FMath.Mix(
FMath.Mix(
Gradient(Permutation(AA + jv.Z), pt.X, pt.Y, pt.Z - 1f),
Gradient(Permutation(BA + jv.Z), pt.X - 1f, pt.Y, pt.Z - 1f),
faded.X),
FMath.Mix(
Gradient(Permutation(AB + jv.Z), pt.X, pt.Y - 1f, pt.Z - 1f),
Gradient(Permutation(BB + jv.Z), pt.X - 1f, pt.Y - 1f, pt.Z - 1f),
faded.X),
faded.Y),
faded.Z));
}
public static V Mix <V> (this V vec, V other, float interPos)
where V : struct, IVec <V, float>
{
return(vec.Map2 <V, float> (other, (x, y) => FMath.Mix(x, y, interPos)));
}
