# MiniMax H3 screw-cap prompt: rotate the cap and grow the neck gap

Loosen an unbranded screw cap with a small axial lift during its partial turn, so the neck gap grows continuously. Distinguish that linked motion from a hinged lid, a straight lift or a rotating whole bottle.

Original synthetic practice still, not a generated result. No model run has been performed.

Files: first-frame.png (1024×1024 actual first-frame input), first-frame.svg (editable geometric design source; do not upload as if it were PNG), prompt.en.txt / prompt.zh.txt, acceptance.blank.csv (all observations empty), task-definition.json and RIGHTS-REVIEW.txt.

## Generator

Use MiniMax H3 base image-to-video. Turn on Add end frame to expose First Frame, upload first-frame.png only, and leave Last Frame empty. Fast requires a pair and is not covered. Choose only options offered by the current interface; opening it does not submit.

## Starting state

The illustration shows a broad teal jar, a shallow orange cap and one pale radial cap mark. A short neck is visible below the cap; the jar body rests on a table. The diagram is not a depiction of a particular package or thread pitch.

Track the jar's lower corners, the cap mark and the dark horizontal neck gap. The cap and body must remain independently identifiable.

## Steps

1. Locate the cap mark and the initial neck gap before trying the prompt. A blank circular cap without an asymmetric mark makes small rotations hard to distinguish.
2. Request only a partial turn with a small rise during that same motion. Leave removal, a hand grip and a contents reveal for separate shots so that the cap-neck relationship stays readable.
3. Compare the top mark and neck gap at the same pauses. If only the gap changes, it may be a straight lift; if the entire jar turns, the intended separation of roles has failed.

## Acceptance

- The jar body stays planted at its original table position.
- The cap mark changes orientation with the cap, without sliding over its surface.
- During the partial turn, the cap rises slightly and the visible neck gap grows while the cap remains centered.
- The ending keeps cap and neck visible without a hinge or an invented contents reveal.

## Limits

This is a visual rotation-and-lift brief. It does not verify a thread pitch, torque, seal integrity or packaging performance.

Read prompt.en.txt before submitting. No pass results or output video are included.