Well, some kind of. It’s the vertices normals, you are positioning across an image. And as you have an UV- mapped texture you want to use it for texturing as well.
Yes it is, as this is a standard feature to all render engines. However I am not using the Lux renderer at all.
Why don’t you stick to blenders internal features to familiarize yourself with mapping in general before adding another level of complexity? If you tweak the internal renderer you will get amazing results and an in depth view into material settings.
I remember that CG has some tutorials about external rendering.
And for any additional question about the Lux-renderer pls. pose it over there: