Implement this class to provide collision filtering. In other words, you can implement this class if you want finer control over contact creation.
Документация по классу ContactFilter
Пример #1
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 public ContactManager(World argPool)
 {
     ContactList = null;
     ContactCount = 0;
     ContactFilter = new ContactFilter();
     ContactListener = null;
     BroadPhase = new BroadPhase();
     pool = argPool;
 }