4.17.3 Handling new keywords

The OBJReader and MTLReader classes can also handle keywords that are not known to the classes. For each keyword, the classes look for a method called handle_<keyword>() which is invoked with the arguments as parameters. If such a handler is not found, the handleUnknown() method is called.

For the standard keywords such handle_<keyword>() handlers are already available. Their task is to preprocess the arguments and call the final handler method (which is just named after the keyword).