grad() [4/4]

static fl::i32 grad ( fl::u8 hash, fl::i32 x, fl::i32 y, fl::i32 z, fl::i32 t )

static

Definition at line 97 of file simplex.cpp.hpp.

                                                                 {
    fl::u8 h = hash & 31;      // Convert low 5 bits of hash code into 32 simple
    fl::i32 u = h < 24 ? x : y; // gradient directions, and compute dot product.
    fl::i32 v = h < 16 ? y : z;
    fl::i32 w = h <  8 ? z : t;
    return ((h&1) != 0 ? -u : u) + ((h&2) != 0 ? -v : v) + ((h&4) != 0 ? -w : w);
}

References t, x, y, and z.