PCL/ROS Cropbox doesn't show anything?

edit

I am trying to crop my PointCloud2 using ROS and PCL_ROS, but unfortunately I can't find my mistake. The mistake being, that Rviz doesn't show my cropped cloud, even though the topic gets published and I can even select it. I even tried to look into the data by iterating over the cloud, (which also, doesn't show in my terminal). I was wondering if you could help me out?

Here is the code:

/All Includes are here....

ros::Publisher pub;

 void
 cloud_cb (const sensor_msgs::PointCloud2ConstPtr& cloud_msg)
 {

 pcl::PCLPointCloud2* cloud = new pcl::PCLPointCloud2;
 pcl::PCLPointCloud2ConstPtr cloudPtr(cloud);
 pcl::PCLPointCloud2 cloud_filtered;

 // Do data processing here...
 pcl_conversions::toPCL(*cloud_msg, *cloud);

 pcl::CropBox<pcl::PCLPointCloud2> boxFilter;
 boxFilter.setInputCloud(cloudPtr);
 boxFilter.setMin(Eigen::Vector4f(1.0, 1.0, 1.0, 0));
 boxFilter.setMax(Eigen::Vector4f(4.0, 4.0, 4.0, 0));
 boxFilter.setTranslation(Eigen::Vector3f(0.0, 0.0, 0.0));
 boxFilter.filter(cloud_filtered);

 sensor_msgs::PointCloud2 output;
 pcl_conversions::fromPCL(cloud_filtered, output);

 for (sensor_msgs::PointCloud2ConstIterator<float> it(output, "x"); it != it.end(); ++it) {
     // TODO: do something with the values of x, y, z

     std::cout <<  it[0] << "/ ";
     std::cout <<  it[1]<< "/ ";
     std::cout <<  it[2]<< "/ ";
     std::cout << std::endl;
 }

 // Publish the data.
 pub.publish (output);

 }

 int main (int argc, char** argv)
{
// Initialize ROS
ros::init (argc, argv, "CROP");
ros::NodeHandle nh;

// Create a ROS subscriber for the input point cloud
ros::Subscriber sub = nh.subscribe ("/kinect2/qhd/points", 1, cloud_cb);

// Create a ROS publisher for the output point cloud
pub = nh.advertise<sensor_msgs::PointCloud2> ("/Cloud_Cropped", 1);

// Spin
ros::spin ();
}