| static private Grad ( int hash, double x, double y, double z ) : double | ||
| hash | int | |
| x | double | |
| y | double | |
| z | double | |
| return | double | |
static double Grad( int hash, double x, double y, double z ) {
int h = hash & 15; // CONVERT LOW 4 BITS OF HASH CODE
double u = h < 8 ? x : y, // INTO 12 GRADIENT DIRECTIONS.
v = h < 4 ? y : h == 12 || h == 14 ? x : z;
return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
}
