You've met Jacob Black and his pack of werewolves before, but you've never seen them like this. Fans were first introduced to the hirsute shape-shifters last November in "The Twilight Saga: New Moon," but when director David Slade took over directing duties from Chris Weitz on "Eclipse," he brought with him a new vision for the wolves. And it was up to visual-effects legend Phil Tippett — his st…