# Cesium3DTile

#### new Cesium.Cesium3DTile(tileset, baseResource, header, parent)
engine/Source/Scene/Cesium3DTile.js 61

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`.

Name | Type | Description
--- | --- | ---
`tileset` | Cesium3DTileset | The tileset
`baseResource` | Resource | The base resource for the tileset
`header` | object | The JSON header for the tile
`parent` | Cesium3DTile | The parent tile of the new tile

### Members

#### readonly boundingSphere : BoundingSphere
engine/Source/Scene/Cesium3DTile.js 611

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

#### readonly children : Array.<Cesium3DTile>
engine/Source/Scene/Cesium3DTile.js 217

Gets the tile's children.

#### readonly computedTransform : Matrix4
engine/Source/Scene/Cesium3DTile.js 109

The final computed transform of this tile.

#### readonly content : Cesium3DTileContent
engine/Source/Scene/Cesium3DTile.js 565

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

#### expireDate : JulianDate
engine/Source/Scene/Cesium3DTile.js 401

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

#### expireDuration : number
engine/Source/Scene/Cesium3DTile.js 394

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

#### readonly extras : object
engine/Source/Scene/Cesium3DTile.js 643

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
engine/Source/Scene/Cesium3DTile.js 166

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.

#### i3sNode : string
engine/Source/Scene/I3SNode.js 920

Gets the I3S Node for the tile.

#### readonly parent : Cesium3DTile
engine/Source/Scene/Cesium3DTile.js 230

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
engine/Source/Scene/Cesium3DTile.js 550

The tileset containing this tile.

#### transform : Matrix4
engine/Source/Scene/Cesium3DTile.js 82

The local transform of this tile.

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