// whatever the use of this should be
public static double GregorianDayOfMonthFromJulianDay(double J)
{
// the following calculates the day of the month of a JD
var p = Fun.Floor(J + 0.5);
var s1 = p + 68569;
var n = Fun.Floor(4 * s1 / 146097);
var s2 = s1 - Fun.Floor((146097 * n + 3) / 4);
var i = Fun.Floor(4000 * (s2 + 1) / 1461001);
var s3 = s2 - Fun.Floor(1461 * i / 4) + 31;
var q = Fun.Floor(80 * s3 / 2447);
var e = s3 - Fun.Floor(2447 * q / 80);
// int s4 = System.Math.Floor(q / 11);
// int m = q + 2 - 12 * s4;
// int y = 100 * (n - 49) + i + s4;
return(e + J - p + 0.5);
}
// whatever the use of this should be
public static double GregorianDayOfMonthFromJulianDay(double J)
{
// the following calculates the day of the month of a JD
int p = (int)Fun.Floor(J + 0.5);
int s1 = p + 68569;
int n = (int)Fun.Floor(4 * s1 / 146097);
int s2 = s1 - (int)Fun.Floor(((double)146097 * n + 3) / 4);
int i = (int)Fun.Floor((double)4000 * (s2 + 1) / 1461001);
int s3 = s2 - (int)Fun.Floor((double)1461 * i / 4) + 31;
int q = (int)Fun.Floor((double)80 * s3 / 2447);
int e = s3 - (int)Fun.Floor((double)2447 * q / 80);
// int s4 = (int)System.Math.Floor((double)q / 11);
// int m = q + 2 - 12 * s4;
// int y = 100 * (n - 49) + i + s4;
double d = e + J - p + 0.5;
return(d);
}
public static double Noise(double x, double y, double z)
{
int xc = (int)Fun.Floor(x) & 0xff, // Find unit cube that
yc = (int)Fun.Floor(y) & 0xff, // contains point.
zc = (int)Fun.Floor(z) & 0xff;
x -= Fun.Floor(x); // Find relative x,y,z
y -= Fun.Floor(y); // of point in cube.
z -= Fun.Floor(z);
double u = Fade(x), v = Fade(y), w = Fade(z);
int a = p[xc] + yc, aa = p[a] + zc, ab = p[a + 1] + zc, // hash of cube
b = p[xc + 1] + yc, ba = p[b] + zc, bb = p[b + 1] + zc; // corners
return(Lerp(w, Lerp(v, Lerp(u, Grad(p[aa], x, y, z),
Grad(p[ba], x - 1, y, z)),
Lerp(u, Grad(p[ab], x, y - 1, z),
Grad(p[bb], x - 1, y - 1, z))),
Lerp(v, Lerp(u, Grad(p[aa + 1], x, y, z - 1),
Grad(p[ba + 1], x - 1, y, z - 1)),
Lerp(u, Grad(p[ab + 1], x, y - 1, z - 1),
Grad(p[bb + 1], x - 1, y - 1, z - 1)))));
}
