# MiniMax H3 conveyor prompt: carry a parcel with its moving support

Separate a moving support surface from a fixed machine frame. The parcel should travel because it remains supported by the moving top belt, without rolling itself or being followed by the camera.

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 original side-view drawing shows a short closed belt around two end rollers, fixed supports and one plain parcel resting on the upper belt edge. Small contrasting marks identify the top belt; a triangle on the parcel makes its orientation visible.

Track the end-roller axles and legs as fixed anchors, not the rotating roller surfaces. Compare the parcel bottom with nearby top-belt marks. The destination is still on the belt, before the right edge.

## Steps

1. Distinguish belt marks, fixed axles and the parcel in the PNG. If you use a real product input, leave enough visible belt on both sides to compare support motion.
2. Ask for one short transport interval. Keep a conveyor-end drop and a repeating loop out of this first attempt; they introduce separate contact and reset questions.
3. For a later output, compare the parcel bottom and one nearby belt mark in several frames. Then check the triangle orientation and the fixed frame before judging overall motion smoothness.

## Acceptance

- The machine legs, frame and both roller axles stay fixed in the shot.
- Top-belt marks and the parcel advance toward frame right over the same interval.
- The parcel remains upright and supported, without obvious backward slip, rolling or a gap below it.
- The same single parcel stops before the belt edge; no drop, duplication or loop reset occurs.

## Limits

This checks visible support and relative motion, not belt traction, load capacity, industrial safety or a friction coefficient. It is an untested H3 teaching method.

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