Does anyone know, if it is possible to render Geometries always? Even if they are outside of the Camera Frustum.
Stupid question, but why would you want to?
A small and dirty fix would be to make the bounds huge so that it always intersect the camera frustum. Be careful when doing this and calling the updateBounds method, because it will recompute the best fit on the object.
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Also, you can see this post for the answer sfera gives:
http://www.jmonkeyengine.com/jmeforum/index.php?topic=5084.0
You can set the camera culling state to CULL_NEVER, and Voila!