public static float Noise(Vector3 p)
{
var u = p.x - Mathf.Floor(p.x);
var v = p.y - Mathf.Floor(p.y);
var w = p.z - Mathf.Floor(p.z);
var i = OldMath.Floor2Int(p.x);
var j = OldMath.Floor2Int(p.y);
var k = OldMath.Floor2Int(p.z);
var c = new Vector3[2, 2, 2];
for (var di = 0; di < 2; di++)
{
for (var dj = 0; dj < 2; dj++)
{
for (var dk = 0; dk < 2; dk++)
{
c[di, dj, dk] = ranvec[perm_x[(i + di) & 255] ^ perm_y[(j + dj) & 255] ^ perm_z[(k + dk) & 255]];
}
}
}
return(TrillinearInterp(c, u, v, w));
}
public override Vector3 Generate() => uvw.Local(OldMath.RandomCosineDirection());
