code: func Vec3Add(dest, v1, v2 Vec3) {
  	dest[0] = v1[0] + v2[0]
  	dest[1] = v1[1] + v2[1]
  	dest[2] = v1[2] + v2[2]
  }
docs: // Vec3Add performs a vector addition. dest = v1 + v2
  //
  //     dest   [out] The result vector.
  //     v1     [in]  The base vector.
  //     v2     [in]  The vector to add to v1.