It was funny when someone else brought up MentalRay vs Carrara's renderer in Vue forum. The thread were locked and did not have an opporunity to post below. I am satisified with Carrara's renderer and texture room it works like MentalRay. Someone made awesome plug-in for texture room and I am considering to purchase them. So the point is that Carrara can do pretty much like MentalRay if you know how to use it.