Filming
Berman backed Carson's choice to hire John A. Alonzo, the director of photography for Chinatown and Scarface. Alonzo was shown more than a dozen Star Trek episodes to familiarize himself with the franchise. He favored lighting scenes as much as possible from within the sets rather than staging lights and flags for each shot. Carson credited this approach with saving time and allowing more freedom when shooting. He later wrote that the production moved at a "TV-like" pace; principal photography concluded after 51 days.
Filming commenced on March 28, 1994. Generations and The Next Generation were filmed simultaneously on different soundstages on the Paramount Studios lot. Scenes that did not feature the television series regulars were filmed first, starting with those in the Enterprise-B deflector room. The scenes of Harriman, Chekov, and Scott reacting to Kirk's apparent death were filmed a week later, to allow time for the deflector room to be suitably distressed to visualize the damage.
Stage 7 was where the Enterprise-B's bridge, deflector room, and corridors were built and filmed. The jolts and shocks of the ship in the hold of the energy ribbon were created by camera bumps and motors to shake the set. Filming of the scenes took place in April 1994, while residents were still skittish from the recent 1994 Northridge earthquake; the effects staff deliberately hid the set shakers until cameras were rolling to elicit more genuine reactions. The stellar observatory set was an elaborate redress of the Enterprise-B's bridge, with added levels and swapped walls changing the layout. Control panels styled after those in the original Star Trek series helped suggest the age of the station.
The cast of The Next Generation started filming their scenes for Generations four days after wrapping on the show. After the filming of the series was complete, there were only six months remaining before the film's release date. The Enterprise-D crash scenes were filmed mid-May 1994, and were among the last remaining shots before the existing Next Generation sets were demolished to make way for Star Trek: Voyager. As a result, the crew distressed the sets for the crash damage more than would have been normal during the series' run.
Despite the budget cuts, Generations shot many scenes on location. The rushed pace of filming meant that not all locations had been selected before the start of principal photography, and the production was still scouting locations until two weeks before the final scenes. The production exhausted possible options within Los Angeles' studio zone and looked up to 150 miles (240 km) away for suitable locations. The Enterprise-D promotion ceremony on the holodeck was filmed on Lady Washington, a full-scale replica of the first American sailing ship to visit Japan. Carson fought hard to keep the shoot during budget trims, deciding to sacrifice other days in the schedule to keep the scene. Lady Washington was anchored at Marina del Rey and sailed out a few miles from shore over five days of shooting. Some of Lady Washington's crew appeared amongst Enterprise crew members.
Picard's house in the Nexus was a private home in Pasadena, California; almost all the furnishings were custom props or outside items. Portions of the scene were shot in May 1994, followed by new shoots five months later. The revisions included adding Picard's nephew René to his imagined Christmas celebration with his family. The house of Kirk's Nexus recollections was located in Lone Pine, California, with the cabin filled with props to represent Kirk's career, from a Klingon bat'leth to a painting of his Enterprise.
Carson wanted a suitably remote and alien mountain location for the film's climax at Soran's compound. The scenes were filmed over eight days on an elevated plateau in the "Valley of Fire", north-east of Las Vegas, Nevada. The rise's height and sloped sides required cast and crew to climb 160 feet (49 m) using safety ropes and carry all provisions and equipment with them. The 110 °F (43 °C) heat was difficult for all involved, especially Shatner, who wore a wool costume. Safety harnesses and wires used to keep performers safe from tumbling off a precipice were removed digitally in postproduction.
As originally filmed, Kirk was shot in the back and killed by Soran. Test audiences reacted negatively to the death, so the scene was rewritten and reshot over two weeks so that Kirk sacrifices himself by leaping across a broken walkway to retrieve Soran's control pad and de-cloak the probe. Paramount allowed the film to go over budget to $35 million for the re-shoots. As the production crew had already spent weeks removing traces of their shoot from the Valley of Fire, the set had to be rebuilt under a very tight schedule, followed by effects work to remove wires and rigging in time for the footage to be included in the final cut.