Rendering only visible Geometries: How to improve performances by rendering managment?

This is not possible. But you can load it the normal JME way.

Geometries?

The engine only allows cubic blocksā€¦

So I have to use geometries? Doesnā€™t it kill performances? How to I add the geometry to the chunk?

Itā€™s a matter of quantity, try and you will see.
Display it the pure JME way (spatials, scene graph, vecor3fā€¦)

okā€¦ :frowning: I think it will have bad impact on performances, but Iā€™ll try