code: public Vector4d set(Vector3fc v, double w) {
          return set(v.x(), v.y(), v.z(), w);
      }
docs: Set the x, y, and z components of this to the components of
  <code>v</code> and the w component to <code>w</code>.
  
  @param v
  the {@link Vector3fc} to copy
  @param w
  the w component
  @return this