Greetings, For a school project, I'm creating a bronchoscopy simulation in Unity and Maya. I'm using the FPS controller to navigate around inside my model of the bronchial tree. However, I'm running into a few problems and I was wondering if anyone had any bright ideas. There are bronchial branches on the sides, as well as on the top and bottom of the model (here's a pic: http://www.dkimages.com/discover/previews/769/20011055.JPG), and the player must be able to enter them. Currently, gravity is a problem, as the controller cannot smoothly navigate into the top and bottom branches. If I reduce gravity too much, it's like the controller is floating through space. I'm at my wit's end as to how to program the controller. If I was animating this, I would put it on an invisible track, but I don't think this is feasible in a game engine. Please help!