{
  "id": "city-closed-expansion-vessel",
  "type": "model",
  "title": "脚付き密閉膨張タンク",
  "titleEn": "Leg-mounted closed expansion vessel",
  "description": "建物の温水・空調機械室に配置する密閉膨張タンク外装。赤い丸胴と中央の継ぎ目、三本の広がった脚と足板、上部保護キャップ、底部接続外形、側面の実開口ノズル、無記載の銘板を造形。屋上の開放型貯水槽とは異なる機械室用の単体プロップです。内部隔膜・流体・圧力調整は省略し、耐圧や設備安全性を示す製造設計ではありません。 ゲーム・可視化向け。製造・構造設計・3Dプリント用途は未検証。 外接寸法（X×Y×Z）0.770 × 1.365 × 0.727 m、8,520三角形。単位m・Y-up、水平中央の接地用原点、最下点Y=0。部品ごとの重複UV0と単色PBR材質を収録し、画像テクスチャ・UV2・コライダー・LOD・リグ・動作は付属しません。静的表示用でUnity/VRChat実機検証は未実施。STLはm・Y-up座標の形状のみで色・材質・UV・階層を含みません。",
  "descriptionEn": "A closed expansion-vessel exterior for building hot-water and HVAC plant rooms. It has a red rounded shell and central seam, three splayed legs/feet, top protective cap, lower connection exterior, genuinely open side nozzle and blank identification plate. This plant-room prop is distinct from an elevated open water-storage installation. Internal diaphragm, fluid and pressure regulation are omitted; it is not a manufacturing design or evidence of pressure or equipment safety. For games and visualization; not validated for manufacture, structural engineering or 3D printing. Bounding dimensions (X×Y×Z): 0.770 × 1.365 × 0.727 m; 8,520 triangles. Metres, Y-up, horizontally centered placement origin with minimum Y=0, not an articulation or wall-mount pivot. Includes overlapping component UV0 and constant-color PBR materials, with no image textures, unique UV2, colliders, LOD, rig or runtime behavior. Static visualization only; Unity/VRChat editor and runtime tests have not been performed. STL uses metre-valued Y-up coordinates and contains geometry only, without color, materials, UVs or hierarchy.",
  "category": "urban",
  "tags": [
    "city",
    "street",
    "original",
    "utilities",
    "tank",
    "plant-room",
    "膨張タンク"
  ],
  "author": "Xenoah",
  "license": "CC-BY-4.0",
  "version": "1.0.0",
  "status": "public",
  "created": "2026-10-14",
  "updated": "2026-10-14",
  "thumbnail": "https://raw.githubusercontent.com/Xenoah/meshcopia/af80e678a81d7d5249bdce8b302efdb78fbdf4e1/content/assets/city-closed-expansion-vessel/preview.png",
  "preview": "city-closed-expansion-vessel.glb",
  "unit": "m",
  "upAxis": "Y",
  "triangles": 8520,
  "dimensions": [
    0.76964,
    1.3645,
    0.727445
  ],
  "uv": "Per-component primitive or automatically unwrapped UVs. Overlapping between components; not a packed unique lightmap atlas. Solid-color PBR materials; no external textures. STL has no colors or UVs.",
  "provenance": {
    "method": "Original AI-agent-authored procedural city geometry",
    "tool": "Blender 4.3.2; Meshcopia original city expansion generator 1.0",
    "rights": "Original geometry and material design created for Xenoah Meshcopia under the owner request for CC-BY-4.0 publication. No third-party meshes, scans, brands, logos or font files.",
    "generatorUrl": "https://github.com/Xenoah/meshcopia/blob/main/scripts/city_expansion/frozen/batch-047/scripts/city_expansion/building_water_plant.py",
    "sourceSha256": "2bce0a7bebc4fcb2f413f0e234260abb81d9075e3fa066676e3d5a0e32fdac57",
    "sourceRecipeSha256": "cccf37a2fbead63951b75a5b0ff543562db60978b8b536a6ec78d85466b6e8e1",
    "sourceHelpersSha256": "99ea76b4c3073b3ec2cfdf732e987c7977bfe5efc986b4a077df8db35a6f9d15",
    "alternateFormat": "STL triangulated from the exact reimported GLB, metre-valued Y-up coordinates. No printability or manufacture validation.",
    "stlSha256": "deca45961e038690515291351918e939e8a670d75220376d4bb8215af2a8622b"
  },
  "usages": [
    {
      "relationship": "original",
      "project": "Meshcopia",
      "sourceUrl": "https://github.com/Xenoah/meshcopia",
      "sourcePaths": [
        "scripts/city_expansion/frozen/batch-047/scripts/city_expansion/building_water_plant.py",
        "scripts/city_expansion/frozen/batch-047/scripts/city_expansion/common.py"
      ],
      "selectors": [
        "city-closed-expansion-vessel"
      ],
      "context": "Original city asset created for this library. No external deployment or reuse claimed."
    }
  ],
  "pageUrl": "https://xenoah.github.io/meshcopia/assets/city-closed-expansion-vessel/",
  "manifestUrl": "https://xenoah.github.io/meshcopia/api/assets/city-closed-expansion-vessel.json",
  "attribution": "Leg-mounted closed expansion vessel by Xenoah / Meshcopia\nhttps://xenoah.github.io/meshcopia/assets/city-closed-expansion-vessel/\nCC BY 4.0 — https://creativecommons.org/licenses/by/4.0/\nChanges: none. If modified, replace this line with a description of your changes.",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "files": [
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      "name": "city-closed-expansion-vessel.glb",
      "format": "GLB",
      "bytes": 329964,
      "sha256": "2bce0a7bebc4fcb2f413f0e234260abb81d9075e3fa066676e3d5a0e32fdac57",
      "url": "https://xenoah.github.io/meshcopia/assets/city-closed-expansion-vessel/source/city-closed-expansion-vessel.glb"
    },
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      "name": "city-closed-expansion-vessel.stl",
      "format": "STL",
      "bytes": 426084,
      "sha256": "deca45961e038690515291351918e939e8a670d75220376d4bb8215af2a8622b",
      "url": "https://raw.githubusercontent.com/Xenoah/meshcopia/af80e678a81d7d5249bdce8b302efdb78fbdf4e1/content/assets/city-closed-expansion-vessel/source/city-closed-expansion-vessel.stl"
    }
  ],
  "downloads": {
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      "schemaVersion": 1,
      "id": "city-closed-expansion-vessel",
      "assetVersion": "1.0.0",
      "packageVersion": "1.0.0",
      "contentPolicy": "fbx-required-textures-single-notice-v1",
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      "archive": {
        "bytes": 233162,
        "filename": "city-closed-expansion-vessel-1.0.0-fbx-minimal-1.0.0.zip",
        "sha256": "a593c23048fae7737b7bd82cc6837bda176ed5646ff018b035920b03efed9656",
        "url": "https://github.com/Xenoah/meshcopia/releases/download/cohort-new251-v1.0.0/city-closed-expansion-vessel-1.0.0-fbx-minimal-1.0.0.zip"
      },
      "files": [
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          "format": "FBX",
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          "sha256": "1bbfdab7c0c7d337b7fd6a63d383b39e2388dfd86f64f4ed033b2830900ea0c1",
          "url": "https://github.com/Xenoah/meshcopia/releases/download/cohort-new251-v1.0.0/city-closed-expansion-vessel.fbx",
          "fetch": {
            "kind": "chunks-gzip-v1",
            "url": "https://xenoah.github.io/meshcopia/download-data/e3871d4d365213949b584d4e25058b7dd804797c87a18847af68851f786bcee7.json",
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      "notice": {
        "bytes": 416,
        "filename": "LICENSE.txt",
        "sha256": "118ceef73954e2b8d44f283d763a238ce5bf8a18ee1653d4bef50dfe6cee1c80",
        "text": "Leg-mounted closed expansion vessel by Xenoah / Meshcopia\nCopyright (c) 2026 Xenoah\nCC BY 4.0: https://creativecommons.org/licenses/by/4.0/\nSource: https://xenoah.github.io/meshcopia/assets/city-closed-expansion-vessel/\nProvided as-is, without warranties (license Section 5).\nChanges: none.\nAdditional changes: Converted unchanged source GLB geometry to FBX, with documented compatible material/texture derivatives.\n"
      },
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        "releaseId": 415820647,
        "releaseTag": "cohort-new251-v1.0.0",
        "state": "published-verified"
      }
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  "previewUrl": "https://xenoah.github.io/meshcopia/assets/city-closed-expansion-vessel/source/city-closed-expansion-vessel.glb"
}