Obj2Tiles-generated B3DM tiles fail 3D-Tiles content validation (exit code 2)

[loicroybon]

When using Obj2Tiles v1.0.13 the generated B3DM tiles and tileset.json pass the spec validation but trigger content errors in 3d-tiles-validator. The validation step exits with code 2, indicating content issues in every LOD tile.

Invocation

obj2tiles \
  my_dataset.obj \
  /work/3dtiles-obj2tiles/tiles

Validation
Using https://github.com/CesiumGS
3d-tiles-validator

Produced outputs

3dtiles-obj2tiles/
├─ tiles/
│  ├─ LOD-0/
│  │  ├─ Mesh-XL-YL-XR-YR.b3dm
│  │  ├─ Mesh-XL-YR-XL-YL.b3dm
│  │  ├─ Mesh-XL-YR-XL-YR.b3dm
│  │  ├─ Mesh-XL-YR-XR-YL.b3dm
│  │  ├─ Mesh-XL-YR-XR-YR.b3dm
│  │  ├─ Mesh-XR-YL-XL-YL.b3dm
│  │  ├─ Mesh-XR-YL-XL-YR.b3dm
│  │  ├─ Mesh-XR-YL-XR-YL.b3dm
│  │  ├─ Mesh-XR-YL-XR-YR.b3dm
│  │  ├─ Mesh-XR-YR-XL-YL.b3dm
│  │  └─ Mesh-XR-YR-XR-YL.b3dm
│  ├─ LOD-1/
│  │  ├─ Mesh-XL-YL-XR-YR.b3dm
│  │  ├─ Mesh-XL-YR-XL-YL.b3dm
│  │  ├─ Mesh-XL-YR-XL-YR.b3dm
│  │  ├─ Mesh-XL-YR-XR-YL.b3dm
│  │  ├─ Mesh-XL-YR-XR-YR.b3dm
│  │  ├─ Mesh-XR-YL-XL-YL.b3dm
│  │  ├─ Mesh-XR-YL-XL-YR.b3dm
│  │  ├─ Mesh-XR-YL-XR-YL.b3dm
│  │  ├─ Mesh-XR-YL-XR-YR.b3dm
│  │  ├─ Mesh-XR-YR-XL-YL.b3dm
│  │  └─ Mesh-XR-YR-XR-YL.b3dm
│  ├─ LOD-2/
│  │  ├─ Mesh-XL-YL-XR-YR.b3dm
│  │  ├─ Mesh-XL-YR-XL-YL.b3dm
│  │  ├─ Mesh-XL-YR-XL-YR.b3dm
│  │  ├─ Mesh-XL-YR-XR-YL.b3dm
│  │  ├─ Mesh-XL-YR-XR-YR.b3dm
│  │  ├─ Mesh-XR-YL-XL-YL.b3dm
│  │  ├─ Mesh-XR-YL-XL-YR.b3dm
│  │  ├─ Mesh-XR-YL-XR-YL.b3dm
│  │  ├─ Mesh-XR-YL-XR-YR.b3dm
│  │  ├─ Mesh-XR-YR-XL-YL.b3dm
│  │  └─ Mesh-XR-YR-XR-YL.b3dm
│  ├─ tileset.json
│  └─ validation_report.json

tileset.json

{
  "asset": {
    "version": "1.0"
  },
  "geometricError": 100.0,
  "root": {
    "transform": [
      -0.15971367836948433,
      0.9871633810781724,
      0.0,
      0.0,
      -0.7036627692186165,
      -0.11384596649119745,
      0.7013542636423288,
      0.0,
      0.6923512462307532,
      0.11201586928643742,
      0.7128128764765174,
      0.0,
      4423440.518572955,
      715670.7489476459,
      4523682.777249486,
      1.0
    ],
    "boundingVolume": {
      "box": [
        381795.09606933594,
        -306.8260650634765,
        377056.1495285034,
        7.84234619140625,
        0.0,
        0.0,
        0.0,
        -1.5904388427734943,
        0.0,
        0.0,
        0.0,
        3.9353981018066406
      ]
    },
    "geometricError": 100.0,
    "refine": "ADD",
    "content": null,
    "children": [
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381799.2405583999,
            -307.57199036872123,
            377056.22932686144,
            0.2233159682364203,
            0.0,
            0.0,
            0.0,
            -0.1503059048021953,
            0.0,
            0.0,
            0.0,
            0.07979835805599578
          ]
        },
        "geometricError": 9.098531491099157,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XR-YR-XR-YL.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381799.2405583999,
                -307.57199036872123,
                377056.22932686144,
                0.2233159682364203,
                0.0,
                0.0,
                0.0,
                -0.1503059048021953,
                0.0,
                0.0,
                0.0,
                0.07979835805599578
              ]
            },
            "geometricError": 3.016377212998924,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XR-YR-XR-YL.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381799.2405583999,
                    -307.5733206182041,
                    377056.2287262246,
                    0.2233159682364203,
                    0.0,
                    0.0,
                    0.0,
                    -0.14897565531927626,
                    0.0,
                    0.0,
                    0.0,
                    0.07919772123568691
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XR-YR-XR-YL.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381797.0566558838,
            -306.8850908095091,
            377056.9075285236,
            1.9605865478515625,
            0.0,
            0.0,
            0.0,
            -1.4682111924439027,
            0.0,
            0.0,
            0.0,
            0.7580000201996882
          ]
        },
        "geometricError": 9.008114067237528,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XR-YR-XL-YL.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381797.0566558838,
                -306.8850908095091,
                377056.9075285236,
                1.9605865478515625,
                0.0,
                0.0,
                0.0,
                -1.4682111924439027,
                0.0,
                0.0,
                0.0,
                0.7580000201996882
              ]
            },
            "geometricError": 3.0013520398709526,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XR-YR-XL-YL.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381797.0566558838,
                    -306.8850908095091,
                    377056.90650367737,
                    1.9605865478515625,
                    0.0,
                    0.0,
                    0.0,
                    -1.4682111924439027,
                    0.0,
                    0.0,
                    0.0,
                    0.7569751739501953
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XR-YR-XL-YL.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381792.428971598,
            -306.7096088996181,
            377058.4635953903,
            1.2540753577486612,
            0.0,
            0.0,
            0.0,
            -1.217301500772919,
            0.0,
            0.0,
            0.0,
            0.34636783599853516
          ]
        },
        "geometricError": 9.029050177826647,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XL-YR-XR-YR.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381792.428971598,
                -306.7096088996181,
                377058.4635953903,
                1.2540753577486612,
                0.0,
                0.0,
                0.0,
                -1.217301500772919,
                0.0,
                0.0,
                0.0,
                0.34636783599853516
              ]
            },
            "geometricError": 3.0048377955934074,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XL-YR-XR-YR.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381792.4297943115,
                    -306.7146993667402,
                    377058.4635953903,
                    1.2548980712890625,
                    0.0,
                    0.0,
                    0.0,
                    -1.2122110336508172,
                    0.0,
                    0.0,
                    0.0,
                    0.34636783599853516
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XL-YR-XR-YR.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381789.2540130615,
            -306.5757446289065,
            377059.1010770798,
            1.9208831787109375,
            0.0,
            0.0,
            0.0,
            -1.2544555664065058,
            0.0,
            0.0,
            0.0,
            0.9838495254516602
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XL-YR-XL-YR.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381789.2540130615,
                -306.5757446289065,
                377059.1010770798,
                1.9208831787109375,
                0.0,
                0.0,
                0.0,
                -1.2544555664065058,
                0.0,
                0.0,
                0.0,
                0.9838495254516602
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XL-YR-XL-YR.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381789.2540130615,
                    -306.5757446289065,
                    377059.1010770798,
                    1.9208831787109375,
                    0.0,
                    0.0,
                    0.0,
                    -1.2544555664065058,
                    0.0,
                    0.0,
                    0.0,
                    0.9838495254516602
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XL-YR-XL-YR.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381793.1354827881,
            -306.87336730957054,
            377057.13337802887,
            1.9605865478515625,
            0.0,
            0.0,
            0.0,
            -1.5174102783205115,
            0.0,
            0.0,
            0.0,
            0.9838495254516602
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XL-YR-XR-YL.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381793.1354827881,
                -306.87336730957054,
                377057.13337802887,
                1.9605865478515625,
                0.0,
                0.0,
                0.0,
                -1.5174102783205115,
                0.0,
                0.0,
                0.0,
                0.9838495254516602
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XL-YR-XR-YL.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381793.1354827881,
                    -306.87336730957054,
                    377057.13337802887,
                    1.9605865478515625,
                    0.0,
                    0.0,
                    0.0,
                    -1.5174102783205115,
                    0.0,
                    0.0,
                    0.0,
                    0.9838495254516602
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XL-YR-XR-YL.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381789.2143096924,
            -306.6798400878905,
            377057.31337793195,
            1.9605865478515625,
            0.0,
            0.0,
            0.0,
            -1.3523864746094887,
            0.0,
            0.0,
            0.0,
            0.8038496223452967
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XL-YR-XL-YL.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381789.2143096924,
                -306.6798400878905,
                377057.31337793195,
                1.9605865478515625,
                0.0,
                0.0,
                0.0,
                -1.3523864746094887,
                0.0,
                0.0,
                0.0,
                0.8038496223452967
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XL-YR-XL-YL.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381789.2143096924,
                    -306.6798400878905,
                    377057.31337793195,
                    1.9605865478515625,
                    0.0,
                    0.0,
                    0.0,
                    -1.3523864746094887,
                    0.0,
                    0.0,
                    0.0,
                    0.8038496223452967
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XL-YR-XL-YL.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381800.9778289795,
            -306.767150878906,
            377055.16567897797,
            1.9605865478515625,
            0.0,
            0.0,
            0.0,
            -1.531524658202983,
            0.0,
            0.0,
            0.0,
            0.9838495254516602
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XR-YL-XR-YR.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381800.9778289795,
                -306.767150878906,
                377055.16567897797,
                1.9605865478515625,
                0.0,
                0.0,
                0.0,
                -1.531524658202983,
                0.0,
                0.0,
                0.0,
                0.9838495254516602
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XR-YL-XR-YR.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381800.9778289795,
                    -306.767150878906,
                    377055.16567897797,
                    1.9605865478515625,
                    0.0,
                    0.0,
                    0.0,
                    -1.531524658202983,
                    0.0,
                    0.0,
                    0.0,
                    0.9838495254516602
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XR-YL-XR-YR.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381797.0566558838,
            -306.8529048639073,
            377055.16567897797,
            1.9605865478515625,
            0.0,
            0.0,
            0.0,
            -1.5635990423426733,
            0.0,
            0.0,
            0.0,
            0.9838495254516602
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XR-YL-XL-YR.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381797.0566558838,
                -306.8529048639073,
                377055.16567897797,
                1.9605865478515625,
                0.0,
                0.0,
                0.0,
                -1.5635990423426733,
                0.0,
                0.0,
                0.0,
                0.9838495254516602
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XR-YL-XL-YR.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381797.0566558838,
                    -306.8529048639073,
                    377055.16567897797,
                    1.9605865478515625,
                    0.0,
                    0.0,
                    0.0,
                    -1.5635990423426733,
                    0.0,
                    0.0,
                    0.0,
                    0.9838495254516602
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XR-YL-XL-YR.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381800.598526001,
            -306.81608581542946,
            377053.19797992706,
            1.5812835693359375,
            0.0,
            0.0,
            0.0,
            -1.5775604248044885,
            0.0,
            0.0,
            0.0,
            0.9838495254516602
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XR-YL-XR-YL.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381800.598526001,
                -306.81608581542946,
                377053.19797992706,
                1.5812835693359375,
                0.0,
                0.0,
                0.0,
                -1.5775604248044885,
                0.0,
                0.0,
                0.0,
                0.9838495254516602
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XR-YL-XR-YL.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381800.598526001,
                    -306.81608581542946,
                    377053.19797992706,
                    1.5812835693359375,
                    0.0,
                    0.0,
                    0.0,
                    -1.5775604248044885,
                    0.0,
                    0.0,
                    0.0,
                    0.9838495254516602
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XR-YL-XR-YL.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381798.0997772217,
            -306.7204665011967,
            377053.77236871375,
            0.9174652099609375,
            0.0,
            0.0,
            0.0,
            -1.3724955208273286,
            0.0,
            0.0,
            0.0,
            0.4094607387378346
          ]
        },
        "geometricError": 9.04098667445511,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XR-YL-XL-YL.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381798.0997772217,
                -306.7204665011967,
                377053.77236871375,
                0.9174652099609375,
                0.0,
                0.0,
                0.0,
                -1.3724955208273286,
                0.0,
                0.0,
                0.0,
                0.4094607387378346
              ]
            },
            "geometricError": 3.0068233527187975,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XR-YL-XL-YL.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381798.0997772217,
                    -306.719277815399,
                    377053.7704878341,
                    0.9174652099609375,
                    0.0,
                    0.0,
                    0.0,
                    -1.3694351309816,
                    0.0,
                    0.0,
                    0.0,
                    0.41134161842637695
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XR-YL-XL-YL.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      },
      {
        "transform": null,
        "boundingVolume": {
          "box": [
            381793.51969558396,
            -306.8246459960935,
            377055.4646641562,
            1.5763737519737333,
            0.0,
            0.0,
            0.0,
            -1.403167724609517,
            0.0,
            0.0,
            0.0,
            0.6848643472185358
          ]
        },
        "geometricError": 9.0,
        "refine": "REPLACE",
        "content": {
          "uri": "LOD-2/Mesh-XL-YL-XR-YR.b3dm"
        },
        "children": [
          {
            "transform": null,
            "boundingVolume": {
              "box": [
                381793.51969558396,
                -306.8246459960935,
                377055.4646641562,
                1.5763737519737333,
                0.0,
                0.0,
                0.0,
                -1.403167724609517,
                0.0,
                0.0,
                0.0,
                0.6848643472185358
              ]
            },
            "geometricError": 3.0,
            "refine": "REPLACE",
            "content": {
              "uri": "LOD-1/Mesh-XL-YL-XR-YR.b3dm"
            },
            "children": [
              {
                "transform": null,
                "boundingVolume": {
                  "box": [
                    381793.51969558396,
                    -306.8246459960935,
                    377055.4646641562,
                    1.5763737519737333,
                    0.0,
                    0.0,
                    0.0,
                    -1.403167724609517,
                    0.0,
                    0.0,
                    0.0,
                    0.6848643472185358
                  ]
                },
                "geometricError": 0.0,
                "refine": "REPLACE",
                "content": {
                  "uri": "LOD-0/Mesh-XL-YL-XR-YR.b3dm"
                },
                "children": []
              }
            ]
          }
        ]
      }
    ]
  }
}

validation_report.json

{
  "date": "2025-07-15T09:24:59.820Z",
  "numErrors": 23,
  "numWarnings": 11,
  "numInfos": 10,
  "issues": [
    {
      "type": "CONTENT_VALIDATION_ERROR",
      "path": "LOD-2/Mesh-XL-YL-XR-YR.b3dm",
      "message": "LOD-2/Mesh-XL-YL-XR-YR.b3dm caused validation errors",
      "severity": "ERROR",
      "causes": [
        {
          "type": "BINARY_INVALID_ALIGNMENT",
          "path": "LOD-2/Mesh-XL-YL-XR-YR.b3dm",
          "message": "The byte length must be aligned to 8 bytes",
          "severity": "ERROR"
        },
        {
          "type": "CONTENT_VALIDATION_ERROR",
          "path": "LOD-2/Mesh-XL-YL-XR-YR.b3dm",
          "message": "Content LOD-2/Mesh-XL-YL-XR-YR.b3dm caused validation errors",
          "severity": "ERROR",
          "causes": [
            {
              "type": "CONTENT_VALIDATION_ERROR",
              "path": "/accessors/1",
              "message": "Accessor's total byteOffset 26094 isn't a multiple of componentType length 4.",
              "severity": "ERROR"
            },
            {
              "type": "CONTENT_VALIDATION_ERROR",
              "path": "/accessors/2",
              "message": "Accessor's total byteOffset 94986 isn't a multiple of componentType length 4.",
              "severity": "ERROR"
            },
            {
              "type": "CONTENT_VALIDATION_INFO",
              "path": "/meshes/0/primitives/0/attributes/TEXCOORD_0",
              "message": "bufferView.target should be set for vertex or index data.",
              "severity": "INFO"
            },
            {
              "type": "CONTENT_VALIDATION_INFO",
              "path": "/materials/0",
              "message": "This object may be unused.",
              "severity": "INFO"
            }
          ]
        }
      ]
    },
    {
      "type": "CONTENT_VALIDATION_ERROR",
      "path": "LOD-1/Mesh-XL-YL-XR-YR.b3dm",
      "message": "LOD-1/Mesh-XL-YL-XR-YR.b3dm caused validation errors",
      "severity": "ERROR",
      "causes": [
        {
          "type": "BINARY_INVALID_ALIGNMENT",
          "path": "LOD-1/Mesh-XL-YL-XR-YR.b3dm",
          "message": "The byte length must be aligned to 8 bytes",
          "severity": "ERROR"
        },
        {
          "type": "CONTENT_VALIDATION_ERROR",
          "path": "LOD-1/Mesh-XL-YL-XR-YR.b3dm",
          "message": "Content LOD-1/Mesh-XL-YL-XR-YR.b3dm caused validation errors",
          "severity": "ERROR",
          "causes": [
            {
              "type": "CONTENT_VALIDATION_ERROR",
              "path": "/accessors/1",
              "message": "Accessor's total byteOffset 26094 isn't a multiple of componentType length 4.",
              "severity": "ERROR"
            },
            {
              "type": "CONTENT_VALIDATION_ERROR",
              "path": "/accessors/2",
              "message": "Accessor's total byteOffset 94986 isn't a multiple of componentType length 4.",
              "severity": "ERROR"
            },
            {
              "type": "CONTENT_VALIDATION_INFO",
              "path": "/meshes/0/primitives/0/attributes/TEXCOORD_0",
              "message": "bufferView.target should be set for vertex or index data.",
              "severity": "INFO"
            },
            {
              "type": "CONTENT_VALIDATION_INFO",
              "path": "/materials/0",
              "message": "This object may be unused.",
              "severity": "INFO"
            }
          ]
        }
      ]
 ....

[dknezevic]

The problem occurs while generating .b3dm header.
in the latest version of the code, Feature Table JSON (UTF-8 text, padded to 8-byte boundary) is not padded to 8 bytes as per .b3dm spec, instead, the header length is added to it and padded to 8-bytes altogether.
This misaligns the gltf magic and makes the .b3dm invalid.

[HeDo88TH]

Can you verify if this issue is resolved?

[dknezevic]

After the patch is applied we are no longer getting the error @loicroybon mentioned above, instead we are just left with a warning related to the uv mapping:

Validation result:
{
  "date": "2025-08-20T09:38:26.164Z",
  "numErrors": 0,
  "numWarnings": 0,
  "numInfos": 1,
  "issues": [
    {
      "type": "CONTENT_VALIDATION_INFO",
      "path": "Mesh.b3dm",
      "message": "Content Mesh.b3dm caused validation infos",
      "severity": "INFO",
      "causes": [
        {
          "type": "CONTENT_VALIDATION_INFO",
          "path": "/meshes/0/primitives/0/attributes/TEXCOORD_0",
          "message": "bufferView.target should be set for vertex or index data.",
          "severity": "INFO"
        },
        {
          "type": "CONTENT_VALIDATION_INFO",
          "path": "/materials/0",
          "message": "This object may be unused.",
          "severity": "INFO"
        }
      ]
    }
  ]
}

these are not deal breaking and can be ignored (or fixed :D))

[loicroybon]

Thanks @dknezevic

[dknezevic]

Additionaly i discovered that this can also happen when .glb is not aligned to 8-byte boundary.
#80 fixes this too.