Darkfall is a node based 360 adventure game. Wintermute engine doesn't natively support those kind of games. It's designed for 2D/2.5D first/third person adventure. Darkfall author has accomplished his game by using a nice trick. All scenes are 3D objects with the textures and the camera from the inside.
I'm afraid you won't find a specific tutorial for this. An excellent generic tutorial is the WME BOOK Online
(donation accepted) by metamorphium which is the best way to learn wintermute engine. But I'm afraid it won't help you with the specific requirement you have. For that it might be better to ask for help (paid or not) at Help wanted and offered
board and of course any game development forums you know.