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In film making, the 180-degree rule is a basic guideline regarding the on-screen spatial relationship between a character and another character or object within a scene. An imaginary line called the axis connects the characters, and by keeping the camera on one side of this axis for every shot in the scene, the first character is always frame right of the second character, who is then always frame left of the first. The camera passing over the axis is called jumping the line or crossing the line.
Note: The object that is being filmed must always remain in the center, while the camera must always face towards the object.
In a dialogue scene between two characters, Matthew (orange shirt, frame left in the diagram) and James (blue shirt, frame right), the camera may be placed anywhere on the green 180° arc and the spatial relationship between the two characters will be consistent from shot to shot, even when one of the characters is not on screen. Shifting to the other side of the characters on a cut, so that James is now on the left side and Matthew is on the right, may disorient the audience.
The rule also applies to the movement of a character as the "line" created by the path of the character. If a character is walking in one direction and is picked up by another camera they must, for example, exit the frame on the left and enter the next shot on the right. A jump cut can be used to denote time. If a character leaves the frame on the left side and enters the frame on the left in a different location, it can give the illusion of an extended amount of time passing.
Another example could be a car chase: If a vehicle leaves the right side of the frame in one shot, it should enter from the left side of the frame in the next shot. Leaving from the right and entering from the right creates a similar sense of disorientation as in the dialogue example.
The 180-degree rule enables the audience to visually connect with unseen movement happening around and behind the immediate subject and is important in the narration of battle scenes.
The imaginary line allows viewers to orient themselves with the position and direction of action in a scene. If a shot after the original shot in a sequence is located on the opposite side of the 180-degree line, then it is called a "reverse cut." Reverse cuts disorient the viewer by presenting an opposing viewpoint of the action in a scene and consequently altering the perspective of the action and the spatial orientation established in the original shot.
There are a variety of ways to avoid confusion related to crossing the line due to particular situations caused by actions or situations in a scene that would necessitate breaking the 180-degree line.
Either alter the movement in a scene, or set up the cameras on one side of the scene so that all the shots reflect the view from that side of the 180-degree line.
One way to allow for crossing the line is to have several shots with the camera arching from one side of the line to the other during the scene. That shot can be used to orient the audience to the fact that we are looking at the scene from another angle. In the case of movement, if a character is seen walking into frame from behind on the left side walking towards a building corner on the right, as they walk around the corner of the building, the camera can catch them coming towards the camera on the other side of the building entering the frame from the left side and then walk straight at the camera and then exit the left side of the frame.
To minimize the "jolt" between shots in a sequence on either sides of the 180-degree line, shoot a "buffer shot" along the 180-degree line separating each side. This lets the viewer visually comprehend the change in viewpoint expressed in the sequence.
|This section possibly contains original research. (March 2013)|
In professional productions, the applied 180-degree rule is an essential element for a style of film editing called continuity editing. The rule is not always obeyed. Sometimes a filmmaker purposely breaks the line of action to create disorientation. Stanley Kubrick did this—for example, in the bathroom scene in The Shining. The Wachowskis and directors Tinto Brass, Yasujiro Ozu, Wong Kar-wai, and Jacques Tati sometimes ignored this rule also, as has Lars von Trier in Antichrist. In the seminal film of the French New Wave, À bout de souffle ("Breathless"), Jean-Luc Godard breaks the rule in the first five minutes in a car scene that jumps between the front and back seats, improvising an "aesthetic rebellion" for which the New Wave would become known.
Some styles used with the 180-degree rule can elicit an emotion or create a visual rhythm. By moving the camera closer to the axis for a close-up shot, it can intensify a scene when paired with a long shot. When the camera is moved further away from the axis for a long shot after a close-up shot, it may provide a break in the action of the scene.
In Peter Jackson's The Lord of the Rings: The Two Towers, Gollum has a conversation with himself or with his other personality. Because the filmmakers use the 180-degree rule, and have the "good" Gollum looking left as he speaks while the "evil" Gollum looking right, the audience perceives Gollum as two different characters talking to each other. This effect builds gradually during the scene: the first few times Gollum shifts between personalities, he is shown starting to turn his head, though the camera changes angles mid-turn. As the argument between the split-personalities intensifies, the editing gradually changes to using jump cuts, not showing Gollum turning his head.[original research?]