Irrlicht Engine

Irrlicht 3D Engine

Developer(s)	Nikolaus Gebhardt et al.
Stable release	1.8.4 / 9 July 2016 (2016-07-09)
Written in	C++
Operating system	Cross-platform: Windows, Linux, OS X, Windows CE
Type	Application framework
License	zlib/libpng-based
Website	irrlicht.sourceforge.net

Irrlicht (pronounced [ˈʔɪɐ̯lɪçt] in German) is an open source game engine written in C++. It is cross-platform, officially running on Windows, OS X, Linux and Windows CE and due to its open nature ports to other systems are available, including FreeBSD, Xbox (up to 1.8.1), PlayStation Portable,^[1] Raspberry Pi, Symbian,^[2] iPhone^[3] and Google Native Client.^[4]

Irrlicht is known for its small size and compatibility with new and older hardware alike, ease of learning, and a large friendly community.^[5] Unofficial bindings for many languages exist including AutoIt,^[6] C++Builder,^[7] FreeBASIC, Game Maker,^[8] Java,^[9] Lua,^[10] .NET,^[11][12] Object Pascal (Delphi),^[13][14] Perl,^[15] Python,^[16] and Ruby,^[17] though most of them have not been maintained for five years or more.

Irrlicht's development began in 2003 with one developer, Nikolaus Gebhardt.^[18] Only after the 1.0 release of Irrlicht in 2006 did the team grow to ten members as of 2011, most of them being developers.^[19]

Irrlicht is a common German term for a will-o'-the-wisp.

Features

Irrlicht supports 3D rendering via OpenGL, DirectX 8, 9, and 11 (with DirectX 11 extension), and internal software rasterizers. DirectX 8 will not be supported after 1.8.1,^[20] effectively ending support for Xbox. External renderers and windowing systems plug in through simple interfaces, giving rise to a community-made Simple DirectMedia Layer (SDL) video driver and support for iPhone and Symbian devices. The engine comes with a library of standard material renderers, allowing fallback materials where user hardware is unable to handle advanced methods. New materials can be added to the engine at run-time, allowing users to write their own as needed. In addition to legacy fixed-function pipeline materials, programmable Pixel and Vertex Shaders (1.1 to 3.0 and 4.0 using GLSL), ARB Fragment and Vertex Programs, HLSL, Cg and GLSL materials are supported.

Per-Pixel Lighting in Irrlicht

Lightmaps and vertex lighting in Irrlicht, rendering a simple dungeon scene

Irrlicht supports many file formats. It will load and display 3ds Max files, Quake 2 MD2 Models, Wavefront .obj objects, Quake 3 .bsp maps, Milkshape3D objects, and DirectX .x files.^[21] Additional format loaders have been written as external plugins. Lights, cameras and 3D objects are managed as a tree of Scene Nodes, arbitrary groupable entities linked together in a scene graph. These nodes are responsible for their own behaviour, but can also be managed by animators, each other, or manually by users.

Many built-in node types exist and can be used together to make complex indoor and outdoor scenes. New nodes are trivial to make and can be added at runtime; many additional node types are available from the community. Node types packaged with Irrlicht include a terrain renderer and sky domes-boxes for outdoor rendering, binary space partitioning (BSP) for indoor rendering, bone based animated meshes, stencil shadows, billboards and particle systems, water surfaces and primitives.

A skinnable 2D graphical user interface (GUI) is available, supporting many controls and the ability for users to plug in their own (or community made) custom widgets at runtime. Irrlicht's internal event system provides mouse, keyboard, joystick and GUI events without having to rely on additional libraries.^[22]

Filesystem access is abstracted allowing platform-independent file and folder access, and transparent access to files within ZIP archives. Other I/O features include an XML reader and writer, the ability to take screenshots, manipulate images and meshes and then save them in several different file formats.

Irrlicht's provides support for simple collision detection including mouse picking, but users are advised that this is not intended as a replacement for a full featured physics engine.

Engine extensions

Irrlicht was designed to be able to load and save the current scene to an XML file; this combined with the engine's open-source licensing model has attracted various programmers and developers to create world editors for Irrlicht to simplify the world-creation process. One such example is the irrEdit world editor, developed by Nikolaus Gebhardt and other members of the company Ambiera.^[23] IrrEdit contains a radiosity lightmap generator and a scripting interface using Squirrel scripts.

Since Irrlicht does not support sound by itself, Ambiera has also developed irrKlang, a non-free, proprietary audio library with an API similar to Irrlicht.^[24] Being developed by the same group, irrEdit supports the use of sounds in levels made by irrEdit for use with irrKlang-enabled compiled DLLs. Also among Ambiera's creations is irrXML, Irrlicht's XML parser.

Many physics libraries have had plugins and wrappers written for Irrlicht, including Nvidia PhysX, Bullet, and Open Dynamics Engine.

More extensions can be found in the Irrlicht forums and in the irrExt project, a side-project of Irrlicht for special purpose add-ons.

There are also some new technologies in forums such as Deferred shading or Shadow mapping. Many users contribute extensions such as Compute Shaders (OpenGL 4.3) and Tessellation Shaders (Shader Model 5.0).

Projects using it

• Amulet of tricolor, a 2D game
• Bolzplatz 2006 by Xenoage Software, a soccer game
• Eve, a robot simulator by the Biologically Inspired Robotics Group (BIRG) at the Swiss Federal Institute of Technology in Lausanne.
• Galactic Dream: Rage of War, a commercial space strategy game by Evolution Vault
• Gekkeiju Online, a gratuitous fantasy multi user role playing game
• H-Craft Championship, an open source SciFi racing game^[25]
• Minetest, an open-world-game similar to Minecraft
• Octodad: Dadliest Catch, a comedic octopus simulator
• Sokoban Challenge, a 3D remake of the classic puzzle game Sokoban for Android
• SuperTuxKart (since version 0.7), a 3D kart racing game; since version 0.8.2 STK used a heavily modified version of Irrlicht called "Antarctica"^[26]

See also

• OGRE
• OpenSceneGraph
• Panda3D
• Delta3D
• Crystal Space
• Visualization Library

References

External links

• Official website
• Author's blog
• Irrlicht wiki at irrlicht3d.org
• Irrlicht at DevMaster.net

Further reading

• Irrlicht review at heise.de (paywalled)
• Using Irrlicht with Java at Bright Hub
• Irrlicht how-to in Linux Journal (April 2009)