Performances

I've done some tests of optimisation with JME3 to increase fps and low necessary memory usage. The first step was to merge the geometries together and it worked well, my framerate increase dramaticaly.

Their is still two problems : the quatity of materials will certainly growup with rules addition and JME can merge only objects with same material, so I will have to test this optimisation method with more realistic rules, and the memory is still overflown because of the number of geometries generated before optimisation, but JME is no culprit for that (as Normen said).

My little 2D extruded system have one big inconvenience : I need to make one mesh for each object before optimisation, because the scenegraph is the only one capable to move and rotate my extruded polygons. So I do many meshes, transform them, then merge them together as much as possible. It takes a long time and memory space. This is a large failure in the object architecture, because formaly, the view code is reponsible of the model modification.

I should get my own 3D prisms and transformation code in the model, so I can manage my objects and merge them as much as possible in one unique mesh, that should be given to the view. Whatever the scenegraph or rendering method I use, this is what I need to do.

Here is a pic to see JME optimisation method : it's not perfect (Ardor, for exemple, makes a global merge and store different materials in a unique packer) but it does the work : 800 000 triangles and 50 fps.

After somes tests and tries, I finaly get my way out and get a correct result with some hundred meters radius full generation and rendering. Of course, I will need to merge vertices and to use a LOD system, but for now, JME performances are quite good. 3 millions of traingles, 4 thousand objects and still 18fps. Thanks to the community for its help !

But my architectural problem still exists and I need to add a transformation layer in my model, and to rewrite some parts of the 3D framework to manage rotation and other stuff myself. Due to the big specialisation of my geometries, I think there are very good optimisaiton opportunities, so I now what to do now.

(This city made of  250 000 shapes occupy 600 mo in the memory : 50 for the model, 500 for the view, 50 for the control)