[LE] Transfering material from Blender nodes to NIF file

[martinsifrar]

So, I 've got a little problem.I 've set up material for my model in Blender, then simplified it to only diffuse, normal and specular map, so it looks like that:

Now, I want to take that material and transfer it to NIF file. I have my 3DS files for model and blood ready, and textures are saved appropriately (diffuse = thing.dds, normal = thing_n.dds, specular = thing_m.dds).

I only want node structure in NIF file that gives a similar result to my material.

And, if MAYBE, someone knows how to control roughness through my mesh, I would be very thankful if he/she shares his/her knowledge.