SceneComposer in the jMonkeyEngine SDK is a nifty tool to try out different particle settings and preview them in a user-friendly way.
The following screenshot shows the effect preview in the SceneComposer window, the spatial in the SceneExplorer window, and the Emitter – Properties window:
To create your own effect, start with an empty scene in the SDK's project window:
assets/Scenesdirectory and go to New | Other….
You find the scene node
FireEffect.j3o in your