{
  "taskId": "expansion-044",
  "slug": "zipper-short-pull-contact-check",
  "language": "zh",
  "mode": "image-to-video",
  "modelId": "MiniMax-H3",
  "evidenceClass": "original-practice-method-not-model-tested",
  "input": {
    "path": "/learning-assets/pseo-expansion70-20261014/zipper-short-pull-contact-check/first-frame.png",
    "editableSource": "/learning-assets/pseo-expansion70-20261014/zipper-short-pull-contact-check/first-frame.svg",
    "role": "first_frame",
    "sourceType": "original-illustration"
  },
  "intent": {
    "cluster": "Historical image-to-video and prompt template family",
    "historicalQueries": [
      "minimax h3 image to video",
      "minimax h3提示词模板",
      "minimax h3 reference images"
    ],
    "evidenceRef": "docs/research/pseo-keyword-gap-2026-10-05/evidence/bing-live-keywords.csv",
    "distinctValue": "A short horizontal zipper closure with a visible finger-to-tab pinch, one slider and a closed/open seam transition, using an original pouch-and-hand source.",
    "existingOwnerBoundary": [
      {
        "path": "/blog/product-shape-consistency-video",
        "difference": "This input and checklist isolate the slider, pinch contact and tooth transition; the broad product article does not provide a zipper contact task."
      },
      {
        "path": "/blog/image-to-video-motion-prompts",
        "difference": "This is a bounded contact-maintenance exercise with visible zipper teeth, rather than a general explanation of first-frame motion."
      }
    ],
    "demandClass": "historical-parent-query; exact long-tail demand unmeasured"
  },
  "title": "拉链短拉：手指接触与齿链交界检查",
  "description": "让单个拉头短距离移动，手指始终夹住同一拉片，分别验收夹持接触和闭合/张开的齿链分界。",
  "goal": "固定收纳包，完成一次手指夹持清楚的短距离闭链动作。原创插画用于规划练习，不代表H3手部接触效果经过独立测试。",
  "preparation": [
    "使用配套包袋图，或能区分拉头、拉片、拇指和食指的授权特写。手掌不能完全遮住拉头。",
    "起始图设为拉头左侧已闭合、右侧仍张开，让向右短拉的闭合过渡有可见依据。",
    "包袋放在支撑面上，机位固定；布料大变形、机位运动和长距离拉动会让接触问题难定位。",
    "只拉一小段轨道。换成真实商品时，先核对其实际闭合方向，不能照搬与实物相反的画面方向。"
  ],
  "prompt": "以上传特写作为起点。收纳包始终静止放在桌面上。可见拇指与食指持续轻夹同一个拉链拉片。手、拉片和唯一的拉头一起沿水平轨道缓慢向右移动一小段，闭合拉头刚经过的短段。两排齿在拉头处逐步合拢，剩余开口留在拉头前方。保持夹持可见、拉片相连、包袋轮廓稳定。停止时手指仍夹住拉片。固定机位，不松开重抓，不出现第二只手，不把布料大幅拉伸。",
  "steps": [
    {
      "title": "先核对闭合方向",
      "body": "在首帧辨认左侧合拢齿和右侧分离齿。自有素材方向相反时，先统一修改方向，再要求闭合。"
    },
    {
      "title": "保持同一对接触",
      "body": "将拇指、食指夹住同一拉片写成接触关系。首帧已经夹住时，不再要求先拾起拉片，否则会多一次接触转换。"
    },
    {
      "title": "追踪拉头与齿链分界",
      "body": "动作刚开始与接近结束各暂停一次。闭合/开口分界应跟随拉头，经过处留下闭合齿，不能只是贴在线上的拉头图形滑动。"
    },
    {
      "title": "检查夹持结束状态",
      "body": "停止时手指仍抓住拉片。对照起点的手指数、拉片形状和包袋轮廓，下一次只改失败的接触或行程变量。"
    }
  ],
  "acceptance": [
    "始终只有一个拉头和一个相连拉片。",
    "拇指与食指全程接触同一拉片。",
    "手指没有穿过拉片或齿链轨道。",
    "拉头沿水平轨道只向右短移一次。",
    "拉头经过处的两排齿逐步合拢，闭合方向没有反开。",
    "包袋稳定受支撑，没有被拖走或拉成新形状。",
    "结尾夹持完整，没有额外手掌或松开重抓。"
  ],
  "troubleshooting": [
    {
      "symptom": "手指先离开拉片又抓回来",
      "change": "只把接触句改成从首帧延续夹持，去掉拾取或重抓要求。"
    },
    {
      "symptom": "拉头移动但齿链分界不变",
      "change": "只把闭合描述改成拉头刚经过处两排齿相接，先检查局部分界再改速度。"
    },
    {
      "symptom": "包袋被手拉长",
      "change": "只缩短行程，再检查包袋与桌面的支撑关系。"
    },
    {
      "symptom": "多余手指遮住接触点",
      "change": "只更换夹持无遮挡的首帧裁切或手部姿态，保留短拉动作以便比较。"
    }
  ],
  "ending": "结尾保留新闭合的短段，手指仍夹拉片。保存起始、中途和停留的夹持与齿链分界特写，两项都要通过。",
  "assetCaption": "原创风格化收纳包、拉链及夹持手部输入；用于生成的画面内没有教学箭头或文字。"
}