35 std::random_device rd;
36 std::mt19937 gen(rd());
37 std::uniform_real_distribution<> disx(xmin,xmax);
38 std::uniform_real_distribution<> disy(ymin,ymax);
39 std::uniform_real_distribution<> disz(zmin,zmax);
40 return Vertex(disx(gen),disy(gen),disz(gen));