extensions

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
ESRI_crs	Written against 3D Tiles 1.1

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.