I have tried various bump mapping tutorials, one of which one from the unity wiki or something but I cant get any of them to work, I have almost got it to work but instead it makes my textures really bright and strange. I have duplicated my texture for a wall but I dont know how to edit it in the inspector panel so that it looks like the tutorials do, can anyone help me with this?
To use a texture for bump mapping, the texture must be a normal map, which is a special type of texture that uses the value of the RGB channels as a ‘surface offset,’ meaning it adds the illusion of height and can be used to add grain, weave, roughness, etc. Bump maps work with lights and shadows, so your surface will act as if it really were 3D, adding more realism.
A normal map is a special kind of texture, and can either be created directly or created from a greyscale heightmap. This tutorial should walk you through all the steps of creating a simple bump map:
http://unity3d.com/support/documentation/Manual/HOWTO-Normalmap.html