code: public Quaterniond add(Quaterniondc q2, Quaterniond dest) {
          dest.x = x + q2.x();
          dest.y = y + q2.y();
          dest.z = z + q2.z();
          dest.w = w + q2.w();
          return dest;
      }
docs: /* (non-Javadoc)
  @see org.joml.Quaterniondc#add(org.joml.Quaterniondc, org.joml.Quaterniond)