bump maps only seem to be working if i put the normal map on the Base(RGB)?
please help thanx :)
You need to use a "Bumpmap" shader if you want to use a bumpmap (It will contain "Bumped" in the name of the shader), and the bumpmap has to be in the blue-violet colored format (I don't know the technical name). It has to look similar to this:
I don't think you can use a black-and-white bumpmap in Unity, but I'm not entirely sure. There are programs to convert the black-and-white bumpmaps into the colored format.
Unity can also auto-generate a bumpmap for you. Duplicate your texture in your Assets folder (Ctrl+D), and then in the Inspector for the duplicate, check the "Generate Bumpmap" option, then click Apply. This will change the texture into an auto-generated bumpmap, courtesy of Unity. You would then insert this second, generated texture into your "Bumpmap" slot in your bumped shader.