grad() [4/4]

static int32_t grad ( uint8_t hash, int32_t x, int32_t y, int32_t z, int32_t t )

static

Definition at line 97 of file simplex.cpp.

                                                                              {
    uint8_t h = hash & 31;      // Convert low 5 bits of hash code into 32 simple
    int32_t u = h < 24 ? x : y; // gradient directions, and compute dot product.
    int32_t v = h < 16 ? y : z;
    int32_t 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.