# Cesium3DTile

#### new Cesium.Cesium3DTile()
Scene/Cesium3DTile.js 91

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

#### readonlyboundingSphere : BoundingSphere
Scene/Cesium3DTile.js 448

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

#### readonlychildren : Array.<Cesium3DTile>
Scene/Cesium3DTile.js 179

Gets the tile's children.

#### readonlycomputedTransform : Matrix4
Scene/Cesium3DTile.js 113

The final computed transform of this tile.

#### readonlycontent : Cesium3DTileContent
Scene/Cesium3DTile.js 402

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 286

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

#### expireDuration : Number
Scene/Cesium3DTile.js 279

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

#### readonlyextras : *
Scene/Cesium3DTile.js 464

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.

#### readonlygeometricError : Number
Scene/Cesium3DTile.js 144

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.

#### readonlyparent : Cesium3DTile
Scene/Cesium3DTile.js 192

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.

#### readonlytileset : Cesium3DTileset
Scene/Cesium3DTile.js 387

The tileset containing this tile.

#### transform : Matrix4
Scene/Cesium3DTile.js 100

The local transform of this tile.