javascript
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three.js
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		[page:LightShadow] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			这在SpotLights内部用于计算阴影。
		</p>

		<h2>代码示例</h2>

		<code>
		//Create a WebGLRenderer and turn on shadows in the renderer
		const renderer = new THREE.WebGLRenderer();
		renderer.shadowMap.enabled = true;
		renderer.shadowMap.type = THREE.PCFSoftShadowMap; // default THREE.PCFShadowMap

		//Create a SpotLight and turn on shadows for the light
		const light = new THREE.SpotLight( 0xffffff );
		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
		light.shadow.focus = 1;            // default

		//Create a sphere that cast shadows (but does not receive them)
		const sphereGeometry = new THREE.SphereGeometry( 5, 32, 32 );
		const sphereMaterial = new THREE.MeshStandardMaterial( { color: 0xff0000 } );
		const 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)
		const planeGeometry = new THREE.PlaneGeometry( 20, 20, 32, 32 );
		const planeMaterial = new THREE.MeshStandardMaterial( { color: 0x00ff00 } )
		const plane = new THREE.Mesh( planeGeometry, planeMaterial );
		plane.receiveShadow = true;
		scene.add( plane );

		//Create a helper for the shadow camera (optional)
		const helper = new THREE.CameraHelper( light.shadow.camera );
		scene.add( helper );
		</code>

		<h2>构造函数</h2>
		<p>构造函数创建一个 [param:PerspectiveCamera PerspectiveCamera] 来管理阴影的世界视图</p>

		<h2>属性</h2>
		<p>有关常用属性，请参阅基础LightShadow类。</p>

		<h3>[property:Camera camera]</h3>
		<p>
			在光的世界里。这用于生成场景的深度图;从光的角度来看，其他物体背后的物体将处于阴影中。<br /><br />

			默认值为PerspectiveCamera，近剪裁平面为0.5。 fov将通过更新方法跟踪拥有SpotLight的角度属性。同样，aspect属性将跟踪mapSize的方面。如果设置了灯光的距离属性，则远剪裁平面将跟踪该值，否则默认为500。
		</p>

		<h3>[property:Number focus]</h3>
		<p>
			Used to focus the shadow camera. The camera's field of view is set as a percentage of the spotlight's field-of-view. Range is [0, 1]. Default is 1.0.<br/>
		</p>

		<h2>方法</h2>
		<p>有关常用方法，请参阅基础LightShadow类。</p>


		<h2>Source</h2>

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