| irr | Everything in the Irrlicht Engine can be found in this namespace |
| irr::core | In this namespace can be found basic classes like vectors, planes, arrays, lists and so on |
| irr::gui | The gui namespace contains useful classes for easy creation of a graphical user interface |
| irr::io | This namespace provides interfaces for input/output: Reading and writing files, accessing zip archives, xml files, .. |
| irr::scene | All scene management can be found in this namespace: Mesh loading, special scene nodes like octrees and billboards, .. |
| irr::scene::quake3 | |
| irr::video | The video namespace contains classes for accessing the video driver. All 2d and 3d rendering is done here |
