lighting texture

You can do this in various ways. Most part of a metallic surface is contributed by reflectiveness and specular lighting. For reflection you can use an environment map -- search Google. For specular lighting you can use the specular component of the material settings. Because the lighting is interpolated between vertices this does require a high degree of tesselation for good results. On the other hand you can use a specular map to achieve the same effect with low tesselation cost.

Greetz,

Illco