SETPIECE

In film production, a 'setpiece' is a scene or sequence of scenes the execution of which requires serious logistical planning and considerable expenditure of money. The term 'setpiece' is often used more broadly to describe any important dramatic or comedic highpoint in a film or story, particularly those that provide some kind of dramatic payoff, resolution, or transition. Thus the term is often used to describe any scenes that are so essential to a film that they cannot be edited out or skipped in the shooting schedule without seriously damaging the integrity of the finished product. Often screenplays are written around a list of such setpieces particularly in high-budget "event movies."
Setpieces are very often planned meticulously using storyboards, screentests, and rehearsals, in contrast to smaller scenes where the director and actors may be more improvisational. Each action requires the combined efforts of different departments - set builders, physical effects, special visual effects. On most films, different groups of people will work on different setpieces individually since they can take a long time to prepare before shooting. For example, the car chase in ''The Matrix Reloaded'' cost $30 million, including $5 million to build the freeway set. Preparation took months.
Notable examples of setpieces include the Snake Pit in ''Raiders of the Lost Ark'', the Death Star Trench Run in ''Star Wars'', and the storming of the volcano lair in the James Bond film ''You Only Live Twice''.
Alfred Hitchcock referred to setpieces as crescendoes and tried to put three of them in each of his movies. In ''Psycho'', these are the shower murder, the murder on the stairs, and the discovery of “Mother.”