JOPS is comprised of a particle system library and a java Swing editor.
The file format consists of a zip file containing the xml description of the system, therefore making it really small, generally just a few KB's.
I use JIBX for XML binding, making the loading and saving process really fast, even for more complex systems.
Xith3D, a java 3D scenegraph, has integration code to support JOPS.
Use Patent Claims
Include Install Instructions
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