Organize render process? How?

You can break your objects into an map where each map key represent a blend state. Then for each blend state you set that state and that state should reference an list of Objects. That way you set the state once and render everything that is using that state. Hope that makes sense. That is just one of the many ways it can be done. Also regarding the state you might want to limit the different blending states you can have.

Just for interest. Is there also a solution which supports an occlusion culling feature? I thought of something which is based on a hierarchical data structure like octree. I think Crysis uses something like this. I know they also use hardware supported visibility detection. Another real problems are transparency effects. All faces usually writes to z-buffer, also the ones with alpha colors. Once rendered you can't draw any geometry behind transparent faces anymore. Then you should sort such faces with a z-order. This is performance eating for complex geometry.

Is it possible to implement both operations in such batch renderer? If yes, how to do this? I need to know tricks which raise the rendering performance at this point.