Bump parameter

[filoxgeox]

Hi, i work with embree 1.0 compiled with visual stusio 2010 64bit by loading an xml files and every material parameter work fine, how i can load a bump map for material? There is a tag like map_Ks o Map_Ns to set for bump? Generally i use a obj code material, i put map_Bump parameter with PPM grayscale texture but nothing change in render. How i can use this parameter?

Thank you in advance

[filoxgeox]

I see some forum and i read that is not included in source. But can you help me where i can put some code to to do this in embree source? Where is the best point of source to put the code befeore the engine render a pixel?