code: public long gridDistance(Vector4ic v) {
          return Math.abs(v.x() - x()) + Math.abs(v.y() - y())  + Math.abs(v.z() - z())  + Math.abs(v.w() - w());
      }
docs: /* (non-Javadoc)
  @see org.joml.Vector4ic#distanceSquared(org.joml.Vector4ic)