The cluster tool has a filtering function. The default position is to show all clusters, however, by checking the "Use filter by category" option it is possible to filter the clusters according to their attributes. Here, it is possible to set the maximum length, width and height for a cluster, including a tolerance (+/-) for each. This set of attributes can be saved as a “Cluster category”. If the attributes are set correctly, the user may filter similarly shaped clusters. For example; for a point cloud with meters as the unit, cars may be filtered quite adequately using the following parameters:
Maximum length: 4.5 +/-: 1.5
Maximum width: 2.0 +/-: 1.0
Maximum height: 1.5 +/-: 0.5
As mentioned before, a set of parameters may be stored as a cluster category. To do so, the user must enter a name in the field 
and click on the button
to save it. In this case, the category “Cars”. Afterwards, when using the 
next to “Cluster category”, a new category will have been created which can be edited (named). Swapping categories in the drop-down list will change the filter applied to the clusters and will show different types of clusters if the categories are set correctly.