# Cesium3DTile

#### new Cesium.Cesium3DTile()
Scene/Cesium3DTile.js 55

A tile in a `Cesium3DTileset`. When a tile is first created, its content is not loaded; the content is loaded on-demand when needed based on the view.

Do not construct this directly, instead access tiles through `Cesium3DTileset#tileVisible`.

### Members

#### readonly boundingSphere : BoundingSphere
Scene/Cesium3DTile.js 549

Get the bounding sphere derived from the tile's bounding volume.

#### readonly children : Array.<Cesium3DTile>
Scene/Cesium3DTile.js 184

Gets the tile's children.

#### readonly computedTransform : Matrix4
Scene/Cesium3DTile.js 91

The final computed transform of this tile.

#### readonly content : Cesium3DTileContent
Scene/Cesium3DTile.js 503

The tile's content. This represents the actual tile's payload, not the content's metadata in the tileset JSON file.

#### expireDate : JulianDate
Scene/Cesium3DTile.js 353

The date when the content expires and new content is requested.

#### expireDuration : Number
Scene/Cesium3DTile.js 346

The time in seconds after the tile's content is ready when the content expires and new content is requested.

#### readonly extras : *
Scene/Cesium3DTile.js 565

Returns the `extras` property in the tileset JSON for this tile, which contains application specific metadata. Returns `undefined` if `extras` does not exist.

##### See:

- Extras in the 3D Tiles specification.

#### readonly geometricError : Number
Scene/Cesium3DTile.js 131

The error, in meters, introduced if this tile is rendered and its children are not. This is used to compute screen space error, i.e., the error measured in pixels.

#### readonly parent : Cesium3DTile
Scene/Cesium3DTile.js 197

This tile's parent or `undefined` if this tile is the root.

When a tile's content points to an external tileset JSON file, the external tileset's root tile's parent is not `undefined`; instead, the parent references the tile (with its content pointing to an external tileset JSON file) as if the two tilesets were merged.

#### readonly tileset : Cesium3DTileset
Scene/Cesium3DTile.js 488

The tileset containing this tile.

#### transform : Matrix4
Scene/Cesium3DTile.js 64

The local transform of this tile.