I have a collection of layers, all of which are organised by different materials. I cant find a way to assign a texture/material to each layer. At the moment I can only work out how to do it with each single object. Is there an easier way of doing this? I want to test different materials for rendering and at the moment it is taking me a very long time to do, there must be a quicker way I do not know of.

Any advices would be greatly appreciated!

Thanks
Charlie