Keeping the camera on one side of an imaginary line that connects two people (or a person and their direction of travel) keeps left and right consistent from cut to cut, so viewers never lose track of the space.
When to use it
When joining many shots: if something exits frame left, it enters from the right in the next shot.
One-click prompt
180-degree rule screen direction, a courier runs from left to right of frame down a sunlit alley carrying a package, always moving left to right, camera tracking on the same side, 35mm lens, bright daylight, urgent mood, 5-second shot.
Tell the AI like this
she walks from left to right of frame (write the same direction word for word in every shot)
The 180 Degree Rule in Film (and How to Break The Line) #180degreerule — Explainer: See why you shouldn't cross the imaginary line between two people if you want to keep left and right consistent.Quick Tips: Understanding The 180 Degree Rule! — Explainer: A short example of the confusion when people's directions flip after crossing the line.Not only the 180 degree rule is important in filmmaking... (SCREEN DIRECTION) — Explainer: See the screen-direction rule: when someone exits left, they enter from the right in the next shot.