Akhiris, maybe you figured it out from the above article but if not here is my opinion as a person who has spent way too many hours/years rotoscoping by hand and with splines. First, maybe we are divided by a word, rotoscoping. Your goal is a look akin to Scanner Darkly and they used rotoscoping but ... Rotoscoping is just the act of tracing the motion of the photographic elements so they can control the image. If you're doing 3D renders like "Lost" then there is no need to rotoscope. One, its a still image and two, your 3D app will output any matte file you would want to exert the control you would need to process the image in the way that you want. Doing anything by hand would be insanity. Unless... you wanted to render your character and then redraw by hand a completely new head, body, whatever. Rotoscoping was mandatory for Scanner Darkly because it was all live action and came with no mattes for seperating all the elements. I'm not sure if any of this gets you closer to what you're aiming for. I hope it helps.