for(int i=0;i<3;i++) if (lhs.elems[i] != rhs.elems[i]) return false;
for(int i=0;i<9;i++) if (lhs.elems[i] != rhs.elems[i]) return false;
      friend bool operator==(const TrVec& lhs, const TrVec& rhs) {        if (lhs.m_BF != rhs.m_BF) return false;        for(int i=0;i<3;i++) if (lhs.elems[i] != rhs.elems[i]) return false;        return true;      }