{
  "blueprintId": "expansion-058",
  "slug": "subject-foreground-occlusion-pass",
  "language": "en",
  "mode": "image-to-video",
  "modelId": "MiniMax-H3",
  "evidenceClass": "original-practice-method-not-model-tested",
  "primaryInput": "/learning-assets/pseo-expansion70-20261014/subject-foreground-occlusion-pass/first-frame.png",
  "inputPolicy": "Upload only the clean first frame; diagram is for review.",
  "title": "One foreground occlusion: walk behind and reappear",
  "description": "A clean column-and-character input plus a three-stage observation sheet for checking one continuous crossing.",
  "goal": "Let one fictional adult walk once from frame left to frame right behind a foreground column, then reappear as the same adult. Hidden body details are unknown during cover; the exercise checks continuity at visible edges.",
  "preparation": [
    "Use a scene with the adult starting entirely to the left of the column. The supplied column is wide enough to hide the body briefly without filling the whole frame.",
    "Keep the column and floor contact visible. Avoid a moving foreground object; that would add a second source of edge movement.",
    "Record the short dark hair, teal coat, rust trousers and shoe shape before the crossing. These are the features to compare after cover.",
    "Use one rightward pass without a turn, stop behind the column or return crossing. Keep the diagram outside the first-frame upload."
  ],
  "prompt": "Start from the uploaded scene. The single fictional adult in the teal coat walks at an even pace toward frame right, passes behind the fixed foreground column once, and reappears on its right side. The column occludes the adult naturally rather than becoming transparent. Keep the same short dark hair, teal coat, rust trousers, body proportions and shoes before and after cover. The floor, column and camera remain stationary. Continue a short distance to frame right and end with the adult fully visible, without turning around or creating another person.",
  "steps": [
    {
      "title": "Capture the visible identity",
      "body": "Before the adult reaches the column, compare head outline, coat hem and shoes to the source. A mismatch already present before cover should not be attributed to reappearance."
    },
    {
      "title": "Inspect the leading edge",
      "body": "Follow the body as it disappears behind the column’s left edge. The column should cover visible parts in sequence instead of slicing, stretching or dragging them along its surface."
    },
    {
      "title": "Review the concealed interval honestly",
      "body": "The hidden region supplies no visible anatomy to inspect. Check only that the column remains opaque, fixed and intact; do not mark hidden identity details as verified."
    },
    {
      "title": "Compare at the trailing edge",
      "body": "At the first clear view on the right, compare the recorded coat, hair and shoe shapes, then watch the entire exit for a duplicate or sudden scale change."
    }
  ],
  "acceptance": [
    "Only one adult enters the occlusion and one adult leaves it.",
    "The adult travels toward frame right throughout the pass.",
    "The foreground column stays fixed and opaque.",
    "Visible body parts disappear behind the edge without stretching onto it.",
    "The coat color, hem and hairstyle match after reappearance.",
    "Body scale and shoe form remain compatible across the covered interval.",
    "The ending shows the adult clear of the column without a cut or a return pass."
  ],
  "troubleshooting": [
    {
      "symptom": "A second adult emerges from the column",
      "change": "Change only the count-and-continuity sentence to one continuous adult; compare the earliest reappearing shoulder rather than accepting a plausible ending."
    },
    {
      "symptom": "The column turns transparent",
      "change": "Strengthen only the occluder’s opaque fixed role. Keep walking speed unchanged so the same cover interval can be checked."
    },
    {
      "symptom": "The coat changes after cover",
      "change": "Shorten only the covered interval by reducing the column width in an authorized replacement input, or choose a slower partial-edge test. Do not change clothing and path together."
    }
  ],
  "ending": "End with the adult fully on the right and save before-cover and after-cover observations. Mark the concealed interval as occluded rather than treating it as evidence of unseen identity continuity.",
  "assetCaption": "Original illustrated practice input and separate observation diagram. These are authored teaching assets, not a MiniMax H3 output or a model-tested result."
}