I am not some pro at computer graphics so I am wondering, is it possible to implement dynamic LOD in JME3? I know that you can have LOD control for some pre-made meshes, but what about having LOD control on a whole scene or at least at some triangle/vertex intense objects (like cylinder or smth)?
Well the terrain has a dynamic lod system, for normal modles it makes no sense. Because only the artist knows wich parts of a model are importatn wich not (like a head, if you reduce some vertexes it might work quite well, but if you touch the nose it will probably look akward.) So while it could be done it makes only very limited sense.
You can create LOD levels on a model using the advanced OgreXML importer in the SDK.