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3D Tiles Extensions

Extensions

Extensions for 3D Tiles 1.1

Extension Notes
3DTILES_bounding_volume_S2 Written against 3D Tiles 1.1 and 1.0
3DTILES_ellipsoid Written against 3D Tiles 1.1 and 1.0

Extensions for 3D Tiles 1.0

Extension Notes
3DTILES_content_gltf Promoted to core in 3D Tiles 1.1
3DTILES_multiple_contents Promoted to core in 3D Tiles 1.1
3DTILES_metadata Promoted to core in 3D Tiles 1.1
3DTILES_implicit_tiling Promoted to core in 3D Tiles 1.1
3DTILES_bounding_volume_S2 Written against 3D Tiles 1.1 and 1.0
3DTILES_batch_table_hierarchy Deprecated in 3D Tiles 1.1
3DTILES_draco_point_compression Deprecated in 3D Tiles 1.1

Vendor Extensions

Extension Notes
MAXAR_content_3tz Written against 3D Tiles 1.0
MAXAR_content_geojson Written against 3D Tiles 1.1
MAXAR_extent Written against 3D Tiles 1.0 and 1.1
VRICON_class Written against 3D Tiles 1.0

About

Extensions allow the base 3D Tiles specification to be extended with new features. They may add new properties to a 3D Tiles JSON object, and may add functionality a tile format or the 3D Tiles Styling expression language.

Extensions may not remove existing properties or features, nor redefine existing properties or features to mean something else.

The optional extensions dictionary property may be added to a 3D Tiles JSON object, which contains the name of the extensions and the extension specific objects.

The following example shows a tile object with a hypothetical vendor extension which specifies a separate collision volume.

{
  "transform": [
     4.843178171884396,   1.2424271388626869, 0,                  0,
    -0.7993325488216595,  3.1159251367235608, 3.8278032889280675, 0,
     0.9511533376784163, -3.7077466670407433, 3.2168186118075526, 0,
     1215001.7612985559, -4736269.697480114,  4081650.708604793,  1
  ],
  "boundingVolume": {
    "box": [
      0,     0,    6.701,
      3.738, 0,    0,
      0,     3.72, 0,
      0,     0,    13.402
    ]
  },
  "geometricError": 32,
  "content": {
    "uri": "building.b3dm"
  },
  "extensions": {
    "VENDOR_collision_volume": {
      "box": [
        0,     0,    6.8,
        3.8,   0,    0,
        0,     3.8,  0,
        0,     0,    13.5
      ]
    }
  }
}

All extensions used in a tileset or any descendant external tilesets must be listed in the tileset JSON in the top-level extensionsUsed array property, e.g.,

{
    "extensionsUsed": [
        "VENDOR_collision_volume"
    ]
}

All extensions required to load and render a tileset or any descendant external tilesets must be listed in the tileset JSON in the top-level extensionsRequired array. Extensions in extensionsRequired must also be listed in extensionsUsed.