# [name]

This is used internally by [page:PointLight PointLights] for calculating shadows

## Example

`//Create a WebGLRenderer and turn on shadows in the renderer var renderer = new THREE.WebGLRenderer(); renderer.shadowMap.enabled = true; renderer.shadowMap.type = THREE.PCFSoftShadowMap; // default THREE.PCFShadowMap //Create a PointLight and turn on shadows for the light var light = new THREE.PointLight( 0xffffff, 1, 100 ); light.position.set( 0, 10, 0 ); light.castShadow = true; // default false scene.add( light ); //Set up shadow properties for the light light.shadow.mapSize.width = 512; // default light.shadow.mapSize.height = 512; // default light.shadow.camera.near = 0.5; // default light.shadow.camera.far = 500 // default //Create a sphere that cast shadows (but does not receive them) var sphereGeometry = new THREE.SphereBufferGeometry( 5, 32, 32 ); var sphereMaterial = new THREE.MeshStandardMaterial( { color: 0xff0000 } ); var sphere = new THREE.Mesh( sphereGeometry, sphereMaterial ); sphere.castShadow = true; //default is false sphere.receiveShadow = false; //default scene.add( sphere ); //Create a plane that receives shadows (but does not cast them) var planeGeometry = new THREE.PlaneBufferGeometry( 20, 20, 32, 32 ); var planeMaterial = new THREE.MeshStandardMaterial( { color: 0x00ff00 } ) var plane = new THREE.Mesh( planeGeometry, planeMaterial ); plane.receiveShadow = true; scene.add( plane ); //Create a helper for the shadow camera (optional) var helper = new THREE.CameraHelper( light.shadow.camera ); scene.add( helper );`

## Constructor

### [name]( )

Creates a new [name]. This is not intended to be called directly - it is called internally by [page:PointLight].

## Properties

See the base [page:LightShadow LightShadow] class for common properties.

## Methods

### [method:null updateMatrices]( [param:Light light], [param:number viewportIndex])

Update the matrices for the camera and shadow, used internally by the renderer.
light -- the light for which the shadow is being rendered.
viewportIndex -- calculates the matrix for this viewport

See the base [page:LightShadow LightShadow] class for common methods.

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/lights/[name].js src/lights/[name].js]