render_layer is currently ignored

[Zuzak]

@the awesome Factorio makers:
render_layer =, or final_render_layer = needs to be readable under type car.
Actually, why is it not read/applied by all entity types?
please expose/make it work for all entity types. A default (so it need not be independently specified for everything and break current mods) per type is fine, but if an entity has it as an override, it should read/apply it.
It is the last hurdle to non-silly looking custom flying objects.

[kovarex]

The problem with this is, that some of the entities (many of them), have quite complicated draw method and they contain several different layers (roboport for example).