constructor( camera ) {

		/**
		 * The light's view of the world.
		 *
		 * @type {Camera}
		 */
		this.camera = camera;

		/**
		 * The intensity of the shadow. The default is `1`.
		 * Valid values are in the range `[0, 1]`.
		 *
		 * @type {number}
		 * @default 1
		 */
		this.intensity = 1;

		/**
		 * Shadow map bias, how much to add or subtract from the normalized depth
		 * when deciding whether a surface is in shadow.
		 *
		 * The default is `0`. Very tiny adjustments here (in the order of `0.0001`)
		 * may help reduce artifacts in shadows.
		 *
		 * @type {number}
		 * @default 0
		 */
		this.bias = 0;

		/**
		 * Defines how much the position used to query the shadow map is offset along
		 * the object normal. The default is `0`. Increasing this value can be used to
		 * reduce shadow acne especially in large scenes where light shines onto
		 * geometry at a shallow angle. The cost is that shadows may appear distorted.
		 *
		 * @type {number}
		 * @default 0
		 */
		this.normalBias = 0;

		/**
		 * Setting this to values greater than 1 will blur the edges of the shadow.
		 * High values will cause unwanted banding effects in the shadows - a greater
		 * map size will allow for a higher value to be used here before these effects
		 * become visible.
		 *
		 * The property has no effect when the shadow map type is `PCFSoftShadowMap` and
		 * and it is recommended to increase softness by decreasing the shadow map size instead.
		 *
		 * The property has no effect when the shadow map type is `BasicShadowMap`.
		 *
		 * @type {number}
		 * @default 1
		 */
		this.radius = 1;

		/**
		 * The amount of samples to use when blurring a VSM shadow map.
		 *
		 * @type {number}
		 * @default 8
		 */
		this.blurSamples = 8;

		/**
		 * Defines the width and height of the shadow map. Higher values give better quality
		 * shadows at the cost of computation time. Values must be powers of two.
		 *
		 * @type {Vector2}
		 * @default (512,512)
		 */
		this.mapSize = new Vector2( 512, 512 );

		/**
		 * The type of shadow texture. The default is `UnsignedByteType`.
		 *
		 * @type {number}
		 * @default UnsignedByteType
		 */
		this.mapType = UnsignedByteType;

		/**
		 * The depth map generated using the internal camera; a location beyond a
		 * pixel's depth is in shadow. Computed internally during rendering.
		 *
		 * @type {?RenderTarget}
		 * @default null
		 */
		this.map = null;

		/**
		 * The distribution map generated using the internal camera; an occlusion is
		 * calculated based on the distribution of depths. Computed internally during
		 * rendering.
		 *
		 * @type {?RenderTarget}
		 * @default null
		 */
		this.mapPass = null;

		/**
		 * Model to shadow camera space, to compute location and depth in shadow map.
		 * This is computed internally during rendering.
		 *
		 * @type {Matrix4}
		 */
		this.matrix = new Matrix4();

		/**
		 * Enables automatic updates of the light's shadow. If you do not require dynamic
		 * lighting / shadows, you may set this to `false`.
		 *
		 * @type {boolean}
		 * @default true
		 */
		this.autoUpdate = true;

		/**
		 * When set to `true`, shadow maps will be updated in the next `render` call.
		 * If you have set {@link LightShadow#autoUpdate} to `false`, you will need to
		 * set this property to `true` and then make a render call to update the light's shadow.
		 *
		 * @type {boolean}
		 * @default false
		 */
		this.needsUpdate = false;

		this._frustum = new Frustum();
		this._frameExtents = new Vector2( 1, 1 );

		this._viewportCount = 1;

		this._viewports = [

			new Vector4( 0, 0, 1, 1 )

		];

	}
Constructs a new light shadow.

@param {Camera} camera - The light's view of the world.