{
  "finding": "STD2-018",
  "title": "Trench family",
  "recorded_result": "No complete selected-model match was found. Related Sturn shares 318 of straightun’s 346 unique triangle geometries in original coordinates; this is substantial partial reuse, not whole-model identity.",
  "checking_steps": [
    "Compare intrench, outrench and humptrench with all 29 models directly named by selected scenes, using four Y quarter-turns and optional X reflection at five decimals.",
    "Treat straightun, Sturn, trenchpot and related terrain as an editorial family. Do not assign a common derivation, intended connection order or identical base merely from appearance."
  ],
  "limitations": "The pieces are grouped by appearance and structure; common derivation is not established.",
  "scope": "The recorded result and checking steps summarize preserved excavation research. The source observations below were recomputed for publication review; they do not rerun the earlier geometry fits, UV checks, reference scans or original-x86 experiments.",
  "source_observations": [
    {
      "archive": "edpieces",
      "name": "contents.obv",
      "size": 302703,
      "sha256": "8ba24a802eb4d1553f5b80096917a0eab7b2179579cc51e9b4a877961e100ca5",
      "identity": "edpieces/contents.obv"
    },
    {
      "archive": "edpieces",
      "name": "grid.lwo",
      "size": 366,
      "sha256": "2270d4d318a0bfccf6a8f91eb1a4284e21a19fcbf2e4abe25a78ce4d0cf42a50",
      "identity": "edpieces/grid.lwo",
      "mesh": {
        "format": "LWOB",
        "vertices": 12,
        "polygon_records": 12,
        "polygon_vertex_counts": {
          "3": 12
        },
        "fan_triangles_excluding_lines_points": 12,
        "PNTS_sha256": "434e5bb3ead56ec4baca9cea4073b06bf02f4893e8f3d3ea1f86fbb269fb6563",
        "POLS_sha256": "7f0d8e9ed02f6603d0a57456718b6596aa981003eb70c17878148bdc4124dbbc"
      }
    },
    {
      "archive": "edpieces",
      "name": "humptrench.lws",
      "size": 444,
      "sha256": "0ea3fa49cca66b060ae7f140c0a8cd52ee6f5f3723d3d5c483f733bc17dd9bfe",
      "identity": "edpieces/humptrench.lws",
      "scene": {
        "objects": [
          {
            "model_basename": "humptrench.lwo",
            "ShowObject": [
              "7",
              "7"
            ]
          }
        ]
      }
    },
    {
      "archive": "edpieces",
      "name": "intrench.lws",
      "size": 1409,
      "sha256": "5c43a70f286d730e5e88c8645ac6fa05792d821c8fea43da7af536da2b6c78d3",
      "identity": "edpieces/intrench.lws",
      "scene": {
        "objects": [
          {
            "model_basename": "intrench.lwo",
            "ShowObject": [
              "7",
              "7"
            ]
          }
        ]
      }
    },
    {
      "archive": "edpieces",
      "name": "outrench.lws",
      "size": 1409,
      "sha256": "23597a1a6e78deffbab71febf546fb44f663f858ad4465eeb424a0f1e2184d2e",
      "identity": "edpieces/outrench.lws",
      "scene": {
        "objects": [
          {
            "model_basename": "outrench.lwo",
            "ShowObject": [
              "7",
              "7"
            ]
          }
        ]
      }
    }
  ],
  "source_selection": "Files named in the canonical research note, including related models and controls. This is not a claim that every listed file is unused or a complete dependency closure.",
  "preserved_research_records": [
    {
      "record": "TRENCH_REACHABILITY.md",
      "sha256": "bcca0e26ea4adf9b53f5dde5e1ac0211b910e020b1c871aec21f149146661c10"
    },
    {
      "record": "trench_reference_audit.json",
      "sha256": "9fa96332be09ed711ad7f86effbaf0f0692295adc28afdde00520161f2fbb634"
    },
    {
      "record": "trench_selected_geometry.json",
      "sha256": "400adc97bc56a55db2ba71d15ecdade66fc7956c2788b1a47c0f5abb8a7256a3"
    },
    {
      "record": "straightun_trench_transforms.json",
      "sha256": "33ee6fa544e0204791744b8764e21a251edeca3b5b7b351e098303ddaa17e58b"
    },
    {
      "record": "scene_trio_relatives_geometry.json",
      "sha256": "080b5e16ce81e6715e0739912dc7c6805b5ab90220f542c37c6b4a8bd9567a5e"
    }
  ],
  "record_provenance": "Research-record hashes bind this summary to preserved local records. They do not make those internal records downloadable or replace the original source checks.",
  "fresh_audit": "/evidence/stunt-track-driver-2/source-audit.json",
  "bounded_relationship_audit": "/evidence/stunt-track-driver-2/relationship-audit.json"
}