JSR 184 is a specification that defines the Mobile 3D Graphics (M3G) API for the J2ME. This API provides 3D functionality in a compact package that’s appropriate for CLDC/MIDP devices. The API provides two methods for displaying 3D graphics content:
The immediate mode API makes it possible for applications to directly create and manipulate 3D elements.
Layered on top of this is a scene graph API, also called retained mode, that makes it possible to load and display entire 3D scenes that are designed ahead of time.
For more information, consult the JSR 184 specification at http://jcp.org/en/jsr/detail?id=184.