Assigning materials to rhino layers

I just started using FluidRay today, I use Rhino 5 on MAC. I can not seem to assign a material to a rhino layer? Is there a way I can assign the same material to different elements in my model that I have organized by layer?

In Rhino, make sure that you objects are set to use the layer’s material. Also, make sure you have a different material for each layer.

In FluidRay, Shift+Click on the object, then All by -> Same Material to select all objects that have the same material assigned.

In the library, right click on the material -> Assign to selection

can I change / flip / rotate the orientation of the material ?

Currently to change the orientation of the material you need to do so inside Rhino, before exporting to FluidRay.