code: func Vec3Mad(dest, v1, v2 Vec3, s float32) {
  	dest[0] = v1[0] + v2[0]*s
  	dest[1] = v1[1] + v2[1]*s
  	dest[2] = v1[2] + v2[2]*s
  }
docs: // Vec3Mad performs a scaled vector addition. v1 + (v2 * s)
  //
  //     dest  [out]  The result vector. [(x, y, z)]
  //     v1    [in]   The base vector. [(x, y, z)]
  //     v2    [in]   The vector to scale and add to @p v1. [(x, y, z)]
  //     s     [in]   The amount to scale v2 by before adding to v1.