二十四格24frames中文
Planning · DirectingNO.161 / 166
Watch: There's an invisible line between A and B (the axis). While the camera stays on one side of it, A is always on the left and B always on the right; once the camera crosses, the two swap sides in the frame and the audience thinks the people have changed.A line-art demo that only illustrates the technique, not finished footage.

Planning · Directing

180-Degree Rule轴线(180 度原则)

When two people talk, imagine a line between them and keep the camera on one side of it. Cross it, and left and right flip.

Category
Directing
Group
Basics
Medium
Planning
Library
161 / 166

This is a step in making a film, not a visual technique. For the whole process, see Make an AI short from scratch.

Prompt templates are written from how generation models usually behave and have not yet been verified one by one with real generations. “Common pitfalls” are judgment from experience, not official limits.

01

When to use it

Designing shots for any two-person dialogue, chase or standoff.

02

Prompt template

(add to every shot) character A always on the left side of frame facing right; character B always on the right facing left; camera stays on the same side of the line between them.
03

Sample prompt · generate a video directly

The technique comes first, followed by the scene, action, performance and duration. Paste it straight into a video model and swap in your own characters and plot.

Shot one, medium two-shot: at a station ticket window, the delivery rider is on the left of the frame facing right, the ticket clerk inside the window on the right facing left, the camera on the south side of the line between them. Shot two, close shot: the delivery rider still on the left of the frame, facing right, speaking. Shot three, close shot: the clerk still on the right of the frame, facing left, shaking her head. All three shots with the camera on the same side, the characters' left-right positions and facing directions unchanged.
04

Common pitfalls

  • Each shot generated separately, so the characters jump from side to side and the audience thinks they've changed.
  • Both people seem to look the same way, as if they're not talking to each other.
  • Crossing the line deliberately without a transition shot.
05

Parameter tips

AI doesn't remember the last shot, so every prompt has to repeat who stands on the left and right and which way they face.