code: public Vector3d set(Vector2dc v, double z) {
          return set(v.x(), v.y(), z);
      }
docs: Set the first two components from the given <code>v</code>
  and the z component from the given <code>z</code>
  
  @param v
  the {@link Vector2dc} to copy the values from
  @param z
  the z component
  @return this