designed to make multimedia productions (games, screen-savers, demos..) easier and more intuitive to write. Consequences are a complete abstraction of resources management (fonts, images, 3D meshes, files, zip-archives, sounds..) and rendering operations
You apply the actions to the particle group at each time step, then read back the particle positions and other attributes into your app, or send them directly to the GPU as a vertex array or as geometry instances.