Mobile 3D Graphics API
Java API specification for 3D graphics, extending Java ME

The Mobile 3D Graphics API, commonly referred to as M3G, is an open source graphics API and file format specification for developing Java ME applications that produce 3D computer graphics on embedded devices such as mobile phones and PDAs.
History
Originally developed at Nokia Research Center Tampere in 2003–2005, M3G was standardized under the Java Community Process as JSR 184 in 22 Dec, 2003. As of 2007, the latest version of M3G was 1.1, but version 2.0 was drafted as JSR 297 in April 2009. In 2010, M3G 1.1 JNI source code and related Symbian OS Java Runtime Environment were subsequently released into open source through the Symbian Foundation.
Rendering
M3G is an object-oriented interface consists of 30 classes that can be used to draw complex animated three-dimensional scenes, it provides two ways for developers to draw 3D graphics: immediate mode and retained mode.
In immediate mode, graphics commands are issued directly into the graphics pipeline and the rendering engine executes them immediately. When using this method, the developer must write code that specifically tells the rendering engine what to draw for each animation frame. A camera, and set of lights are also associated with the scene, but is not necessarily part of it. In immediate mode it is possible to display single objects, as well as entire scenes (or worlds, with a camera, lights, and background as parts of the scene).
Retained mode always uses a scene graph that links all geometric objects in the 3D world in a tree structure, and also specifies the camera, lights, and background.
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