code: public static StructureInterfaceList calculateInterfaces(Structure struc) {
  		CrystalBuilder builder = new CrystalBuilder(struc);
  		StructureInterfaceList interfaces = builder.getUniqueInterfaces();
  		logger.debug("Calculating ASA for "+interfaces.size()+" potential interfaces");
  		interfaces.calcAsas(StructureInterfaceList.DEFAULT_ASA_SPHERE_POINTS, //fewer for performance
  				Runtime.getRuntime().availableProcessors(),
  				StructureInterfaceList.DEFAULT_MIN_COFACTOR_SIZE);
  		interfaces.removeInterfacesBelowArea();
  		interfaces.getClusters();
  		logger.debug("Found "+interfaces.size()+" interfaces");
  		return interfaces;
  	}
docs: Calculates the interfaces for a structure using default parameters
  @param struc
  @return