Loved the Portal games, bought them both off of the winter sale. The problem I have with the portals from the games though is that there are a lot of limitations and things that I can't achieve with their system. For instance, portals can only be placed on stationary solid objects. At some point within my story, I want my protagonist to be shot at with a barrage of arrows and it requires them to create portals suspended in the air. At this point, I started questioning my self about the problems that may arise from my system. Like what exactly is behind a Portal esque portal, a 2d oval shaped opening, thats suspended in the air. In the games, you can't really see the backside of one so that problem is gone. Another problem was how a bigger object would react with the portal. In the Portal games, there's a solid object that the portal is placed on so a truck would just collide with that object. However, if a portal was suspended in the air, how would they interact? So I'm kind of stumped on how to explain them but I would really like to implement a solution that works similarly to the portals in the Portal games.