function round$2(out, a) {
    out[0] = Math.round(a[0]);
    out[1] = Math.round(a[1]);
    out[2] = Math.round(a[2]);
    return out;
  }
Math.round the components of a vec3

@param {vec3} out the receiving vector
@param {ReadonlyVec3} a vector to round
@returns {vec3} out