1: Create and light your scene as desired. Turn on Shadows and Choose and set type to VRay shadow. If you hit render you will see harsh shadows and some objects are not visible if not directly lit.
2: Open up your render dialog and assign Vray as the current renderer. Then go to the Renderer tab and scroll down to the "Vray: Indirect Illumination (GI)" section and check the "On" box. Set the secondary bounces to none. In the "VRay: Irradience map" section choose a preset. Higher presets will be better but will render slowly. Check the "Show Calculation Phase" box so you can see the irradience map at work when you hit render.
If you render off your scene now you may notice some subtle changes. In the example, look at the bottom of the teapot where you can see light has bounced off the ground plane and illuminated what was previously in shadow. However, the torus is still not visible as we have only set the light to bounce off objects once, in order to speed things up. So...
3: Go to your render panel again, scroll down to "VRay: Environment" and check the "On" box. This will add a skylight to your scene, illuminating areas that your scene lights don't.
Please note, GI is not the answer to all your lighting problems, it's not just a matter of sticking a light in your scene and turning GI on. It's merely an aid to give your lighting a realistic look, you'll still have to do all the hard work 
     
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