metalness map in cycles? I made a model that consists of several pieces, mostly metal but some are non-metal. Instead of making a completely seperated texture map for the non-metal pieces I decided that I am going to make one big instead that has all the necessary textures but then I realised that I don't know if it is even possible to use metalness map with cycles renderer. If it is then how would I set up the nodes?

Regards,
Koreenium
You can assign several materials to a mesh and a material can be used by several meshes.

In this first image, 2 materials (1) are assigned to the left object (2), and the wood part has its UVs located in (3) in the texture.



In this second image, again 2 materials are assigned (1) but to the right object (2), and its UVs are located in (3).



To assign several materials, use the '+' button on the right, so that a new material slot appears.
Then assign (or create) a material for this slot.
Last step, go to edit mode, select the wanted faces and click 'assign' in the material part :