The Segment Header, Field by Field

Quick answer: Every segment starts with a short header that sets the stage before the first shot: Location (a scene chip), Time, Weather, the Opening frame (what the first frame shows), Set dressing (what is in the room, and any background people) and Props (the objects the segment uses). Time, Weather and Set dressing apply to every shot in the segment; the Opening frame is where the segment starts and where it joins the segment before it. All of it is editable text, except the chips.
Still from “Neon Debt”, an AI short drama generated end-to-end by SceneMixer (7 characters, 1 episode)
Sample: “Neon Debt” — Game Engine Realism, 1 episode, produced end-to-end by SceneMixer from the script · watch the episodes

Open a finished episode and read the header of any segment. It is the same six fields every time.

Location

A scene chip from the project’s Scenes. It is the one place the whole segment happens in. To change it, put the cursor in the field, type @ and pick another scene. Two places means two segments. Props and locations.

A storyboard segment: location, time and weather fields, then numbered shots with durations, asset chips and spoken lines
A segment header: Location, Time, Weather, the opening frame, Set dressing and Props, then the shots.

Time

Time of day, and the moment if it matters: Night, active air raid; Late afternoon, just after the bell. It sets the light for every shot in the segment. If the next segment is later, change its Time and the light follows; if you leave it, nothing has moved.

Weather

Plain words: Clear, Falling ash and smoke, Rain on the glass. Like Time, it applies to the whole segment and sits on top of the room, which does not change.

Opening frame

What the very first frame shows: the framing, who is in the picture and how they are standing or sitting, where they are in the room, what is in their hands. It is written from the end of the previous segment, so the join is continuous; when a segment was split in two, the second piece’s opening says it continues from the first. Edit it to change how a segment starts. Continuity between segments.

Only people who are actually visible in that first frame belong here. Someone in the room but out of the picture does not.

Set dressing

The room in words: the furniture that matters, the light source, the mess, the parked cars outside. No chips needed. At the end of the same line, background people are declared if the segment has any: Background people: diners at the other tables, quiet. Delete that clause and the room is empty of extras for every shot in the segment. Who is in frame.

Props

The objects the segment uses, as prop chips. List a prop here and name it again in the shots that handle it; a prop listed here but never used in a shot is dropped when you save. Why props stay the same.

Editing the header

It is text like the rest of the storyboard: click Edit Script, change it, Save. Free. Keep it consistent with the shots — a header that says night and a shot that describes sunlight will fight each other. What you can change.

FieldApplies toWrite
LocationThe whole segmentOne scene chip
TimeEvery shotTime of day, plus the moment if it matters
WeatherEvery shotPlain words
Opening frameThe first frame, and the join to the previous segmentFraming, who, posture, position, what is in hand
Set dressingEvery shotThe room in words; Background people: at the end if any
PropsThe segmentProp chips, also named in the shots that use them

FAQ

Which header fields affect every shot?

Time, Weather and Set dressing. The Opening frame describes only the first frame; Location is the one place the segment happens.

How do I make a segment happen at night?

Set Time to night. The room stays the same; the light changes.

Can I change the Opening frame?

Yes. It is text. Describe the frame you want the segment to start on; keep it consistent with how the previous segment ended.

Where do extras and crowds go?

At the end of Set dressing, as Background people: … They are not cast and need no chips.

A prop I listed vanished from the header.

It was not used in any shot. Name it in a shot and it stays.

Read one header, then write one

Open a segment, change its Time to night, save, and regenerate to see the light move.

Open the editor

Updated September 26, 2026

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