Mental Ray will NOT render Vray materials, maps, lights etc. So you have to convert/change all these things (as already mentioned).
How To Install Vray Material Converter Calculator Online
You can either manually change everything or use a dedicated 'Vray to MR' converter. But in both cases there is an issue that most Vray users overlook: If you don't have Vray installed you can't use a converter and you can't see all maps etc., which makes the switch almost impossible.So in order to do anything at all, you'll need to install a Vray demo. This will make it possible to see the maps and to use a material converter, also after the demo has expired (it just won't render).If you want to use a converter, then make a search at Scriptspot.com - there might be something for free. Otherwise you can buy a converter called 'Universal Material Converter' which can convert between several different 'types' including 'Autodesk Library Materials' (which I haven't seen any other converter that could do). Al fiqh al islami wa adillatuhu pdf in urdu.
How To Install Vray In Max 9
UMC is also to find at Scriptspot.Hope it helps.