{
  "finding": "STD2-016",
  "title": "90tunturnR turn",
  "recorded_result": "No complete match was found. The candidate has 289 points / 512 triangles; the maximum overlap with 90turnl/r is 64 points and two triangles.",
  "checking_steps": [
    "Compare 90tunturnR.lwo with 90turnl, 90turnr, T90turnl and T90turnr, testing four Y quarter-turns and optional X reflection about the original origin at five decimals.",
    "90tunturn.lwo instead matches 90turn.lwo’s 406-point / 726-triangle coordinate sets. Do not infer a left/right pair from the two tunnel-turn filenames."
  ],
  "limitations": "The exact configuration is omitted; its familiar appearance does not establish normal selection.",
  "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": "90tunturn.lwo",
      "size": 21350,
      "sha256": "00ba8d39dba7238d37e901f19840cba5e81e797f82774320aaa84aaec43137ac",
      "identity": "edpieces/90tunturn.lwo",
      "mesh": {
        "format": "LWOB",
        "vertices": 406,
        "polygon_records": 726,
        "polygon_vertex_counts": {
          "3": 726
        },
        "fan_triangles_excluding_lines_points": 726,
        "PNTS_sha256": "733ddcd6332c3ebc7e5fa92d64959f7f4680d51205564f369aaa2368cf82db90",
        "POLS_sha256": "807ba5aded87bf5b703ac42a50f7100663970f04dc00204de5df1e2f53b9f23a"
      }
    },
    {
      "archive": "edpieces",
      "name": "90tunturn.lws",
      "size": 1435,
      "sha256": "bffa26c74d65bf6717eb080b0362e69823053e095abf2ff779b29781ac625779",
      "identity": "edpieces/90tunturn.lws",
      "scene": {
        "objects": [
          {
            "model_basename": "90tunturn.lwo",
            "ShowObject": [
              "7",
              "7"
            ]
          }
        ]
      }
    },
    {
      "archive": "edpieces",
      "name": "90tunturnR.lwo",
      "size": 8684,
      "sha256": "a3b8ee92d00881da718d5f0f1edde7921b283f994caa3f4c3ad8294493b78bbf",
      "identity": "edpieces/90tunturnR.lwo",
      "mesh": {
        "format": "LWOB",
        "vertices": 289,
        "polygon_records": 512,
        "polygon_vertex_counts": {
          "3": 512
        },
        "fan_triangles_excluding_lines_points": 512,
        "PNTS_sha256": "bc5f94919ed8f1b4cc21f13b97c81781593ace2ce367a4c9c72160bc4bbe0484",
        "POLS_sha256": "c48abcaba39c0435109e9bd2ee114540a23156e566796f4fc304f8f8dc638d7c"
      }
    },
    {
      "archive": "edpieces",
      "name": "90tunturnR.lws",
      "size": 1411,
      "sha256": "da71203638340fc8356c3d3d4423f337fc12b06e19c68d261d5010c9c57f41b0",
      "identity": "edpieces/90tunturnR.lws",
      "scene": {
        "objects": [
          {
            "model_basename": "90tunturnR.lwo",
            "ShowObject": [
              "7",
              "7"
            ]
          }
        ]
      }
    },
    {
      "archive": "edpieces",
      "name": "90turn.lwo",
      "size": 12436,
      "sha256": "698e9193642c50ed6f1997dac63e953de3c445a427747f120de996fb4a1c1cba",
      "identity": "edpieces/90turn.lwo",
      "mesh": {
        "format": "LWOB",
        "vertices": 406,
        "polygon_records": 726,
        "polygon_vertex_counts": {
          "3": 726
        },
        "fan_triangles_excluding_lines_points": 726,
        "PNTS_sha256": "733ddcd6332c3ebc7e5fa92d64959f7f4680d51205564f369aaa2368cf82db90",
        "POLS_sha256": "2f254749fa3efc90c3327849ca9f0dad7837abdfb8d208c0422d51440f84c514"
      }
    }
  ],
  "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": "TUNNEL_TURN_REACHABILITY.md",
      "sha256": "f1fb471422533d53d6afe958b45ea5fda0fbb644b90137e21a80abc5c7d80b8f"
    },
    {
      "record": "tunnel_turn_reference_audit.json",
      "sha256": "af40d8518400fb376258ac2d20cd61a455c6b38c10a88d2557f55ccfec9137a0"
    },
    {
      "record": "tunnel_turn_geometry_comparison.json",
      "sha256": "998260d18e29b73c2322b3d3c5b2876d4942d1a5cd96c647074db24005046cd2"
    }
  ],
  "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"
}