My questions are
1. How do I preview my light map on view port? Do I have to switch to direct x driver and use the light map shader? I noticed that the "base texture" won't let you use change any parameter on the map (like tile).
2. If I want to export to the game engine, to which map slot do I need to assign the light map (like self illumination, ambient color etc.)? I've tried to assign the light map to the self illumination map slot but the light map doesn't display properly; it's like the entire render looks under exposure.