How to make Mental Ray light bounce inside interior? (Maya 2016)

RyanShearer3D

Hi,

I've got an interior area built with 2 window areas and a Mental Ray Physical Sun shining through one of those. The thing is when I render, the room is incredibly dark as the light only really points and doesn't bounce and illuminate the whole room like the actual sun would. Is there anyway to make the light illuminate the whole room? It works when I remove the roof, obviously, but not when the place is sealed. The room has 2 windows, each with mental ray material X glass thick textures.

 

Thank you in advance

dur23

Look up portals for mental ray.