well ur light is changing at least well :p, u see, when u use the ShadingColorMaterial u light the face of the triangles filling them with a color, so if the problem is that 1 wall of the room isnt changing the shades may be due to the fact that it doesnt have enough triangles to show the change.
too much blah blah blah? lets check a picture better :p http://www.ierafaelperez.co.cc/fotico.JPG ok now if u want to have a very good texture, without elevating ur poly account, u better use baked textures, but i warn u that u cant be playing with the lights so much with this method, but it will give a feeling of high poly room, hope this helps P.D. (sorry for the language i suck at english :p)
