Irrlicht 3D Scene (.irr)
The IRR (Irrlicht 3D Scene) file extension is associated with the Irrlicht Engine, an open-source 3D graphics engine written in C++. IRR files store scene graphs in XML format, containing elements such as particle systems, animators, and materials, which Irrlicht references to render game environments. These files may also include links to IRRMESH files for defining scene nodes. The Irrlicht Engine, first released in 2003, gained popularity for its lightweight design and cross-platform compatibility, making it a preferred choice for independent game developers and graphics programmers.