Passage: Cameron wanted to push the boundary of special effects with his film, and enlisted Digital Domain to continue the developments in digital technology which the director pioneered while working on The Abyss and Terminator 2: Judgment Day. Many previous films about the RMS Titanic shot water in slow motion, which did not look wholly convincing. Cameron encouraged his crew to shoot their 45-foot-long (14 m) miniature of the ship as if "we're making a commercial for the White Star Line". Afterwards, digital water and smoke were added, as were extras captured on a motion capture stage. Visual effects supervisor Rob Legato scanned the faces of many actors, including himself and his children, for the digital extras and stuntmen. There was also a 65-foot-long (20 m) model of the ship's stern that could break in two repeatedly, the only miniature to be used in water. For scenes set in the ship's engines, footage of the SS Jeremiah O'Brien's engines were composited with miniature support frames, and actors shot against a greenscreen. In order to save money, the first-class lounge was a miniature set incorporated into a greenscreen backdrop behind the actors. The miniature of the Lounge would later be crushed to simulate the destruction of the room and a scale model of a First-Class corridor flooded with jets of water while the camera pans out.

Question: What was done in many films?
water in slow motion