{
  "schemaVersion": 1,
  "task": "M16-GAP-00015",
  "parentTask": "M16-GAP-00014",
  "status": "in_progress",
  "goal": "Make the same minimal fixture produce observable datablock:MetaBall data in Blender desktop and WASM/Main, with save/reopen stability. Change only this gap; do not expand to other data-blocks, editors, or browsers.",
  "scope": {
    "gap": "datablock:MetaBall",
    "ownerFamily": "RNA_DATABLOCK",
    "implementationClass": "LOCAL_EXACT"
  },
  "commands": [
    "build_blender_5.2.0/bin/blender -b --factory-startup --python tools/web/generated/M16-GAP-00015.py -- tests/files/web/generated/M16-GAP-00015-datablock-MetaBall.blend",
    "npm --prefix web run test:generated-gap -- --task M16-GAP-00015",
    "node tools/web/check-generated-gap.mjs --task M16-GAP-00015"
  ],
  "inputPaths": [
    "tests/files/web/generated/M16-GAP-00015-datablock-MetaBall.blend",
    "tools/web/generated/M16-GAP-00015.py",
    "blender-5.2.0/source/blender/web_engine/web_engine_blend_reader.cpp",
    "tools/web/check-generated-gap.mjs",
    "tests/golden/M16-GAP-00015/",
    "docs/status/M16-GAP-00015.md",
    "tests/golden/M16-GAP-00015/manifest.json"
  ],
  "exitCriteria": [
    "desktop fixture evidence exists",
    "WASM uses the same fixture",
    "comparator passes",
    "save/reopen preserves Main",
    "manifest hashes all artifacts"
  ],
  "nextTask": "M16-GAP-00016",
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    "optionalByNeed": [
      "docs/WEB_BLENDER_MODELER_V1_SCOPE.md",
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      "任务卡明确命名的长期计划小节"
    ],
    "forbiddenByDefault": [
      "完整 CURRENT_EXECUTION_PLAN.md",
      "完整 PROJECT_STATUS_AND_NEXT_WORK.md",
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      "完整 parity/WBS 计划",
      "README 历史和 test-results/"
    ]
  },
  "parent": {
    "manifest": {
      "schemaVersion": 1,
      "task": "M16-GAP-00014",
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      "status": "done",
      "nextTask": "M16-GAP-00015",
      "artifactCount": 11
    },
    "statusSummary": [
      "# M16-GAP-00014 Status",
      "status: done  ",
      "task: Mesh data-block LOCAL_EXACT slice  ",
      "updated: 2026-08-19 America/New_York",
      "scope: Blender 5.2 Mesh geometry metadata for one quad: counts, triangulated indices, positions, UV layer identity and UV values.",
      "evidence:",
      "- `tools/web/generated/M16-GAP-00014.py` generated a retained `WebGapMesh` quad with four vertices, one face and one `WebGapUV` layer.",
      "- Desktop report reopened after save and matched exactly: 4 vertices, 4 edges, 1 face, 4 corners, 2 triangles, deterministic positions/indices and UV values."
    ]
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