grad() [3/4]

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

static

Definition at line 86 of file simplex.cpp.

                                                                   {
    int32_t h = hash & 15;                                // Convert low 4 bits of hash code into 12 simple
    int32_t u = h < 8 ? x : y;                            // gradient directions, and compute dot product.
    int32_t v = h < 4 ? y : (h == 12 || h == 14 ? x : z); // Fix repeats at h = 12 to 15
    return ((h&1) != 0 ? -u : u) + ((h&2) != 0 ? -v : v);
}

References x, y, and z.