How to use normal map textures?

Can Unitys terrain editor “paint” a texture that has normal map? Lets say for example I have created a terrain like a volcano full of cracks etc… So i will have my main texture call it Cracks.psd and I have a normal map call it Cracks_normal.psd. I now want to combine the two textures to make 1 texture that i can use to paint the area with unity so that the surface looks 3d?

Or can I apply a normal map to a terrain texture?

If so, how do i do this?

Here is one approach: Private Site

thanks for the link, im not too sure about this "To use it simply attach the C# script to your terrain object " ? I dont have a terrain object, I have unity terrain editor with my textures and now I can paint on the terrain, so im not sure where to attach the script, too what object?

If you use Unity terrain, there is a terrain object in the scene. It gets created automatically when you hit the “create terrain” menu item.

I know exactly what you mean, but i cant find “terrain object” where does unity store it, or what is it called? Maybe im just not looking for the right name?

Screenshot of what i have attached:

It’ll be in your scene hierarchy, not your project folder.

It’ll be called whatever you called your terrain.

found it under static\terrain - the normal “terrain” and when i click on scrips edit, it wont allow me to edit?