The previous WMO I had a pretty dark interior because I didn't know how the lighting was done on WMOs yet ( Previous Video: https://www.youtube.com/watch?v=HKKaGK8Oy_I) , So I started playing around with it. This is all through a hex editor so it's not like I can pick where the highlight starts and ends, I'm just doing one single white pass on all vertex's to achieve the effect shown in the video.
The Entering/Exiting portals are made wrong that's why it flickers when I leave and enter the Inside at various Camera Angles. The portals are needed if you want to be able to see outside once you've entered the room, otherwise it'd just show an all purple screen like what happens in one of the flickers, except it'd be like that all the time while you are in the room.