API model to track particles which come into contact with named geometries, which some of you might find useful for visualising. The preference file (geometryNames.txt) holds the name of the geometries which you are interested in knowing whether a particle contacted them or not. If a particle contacted one of the geometries in the preference file, it will get a value of 1 added to the custom property “Num pg contacts”. Pretty simple. Included the src code and an example with the compiled dll.