javascript
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three.js
cermin dari https://github.com/tazdij/three.js.git


			
				
					
						
						
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		[page:LightShadow] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			这是用于在[page:DirectionalLight DirectionalLights]内部计算阴影<br /><br />

			与其他阴影类不同，它是使用OrthographicCamera来计算阴影，而不是PerspectiveCamera。这是因为来自DirectionalLight的光线是平行的。
		</p>

		<h2>代码示例</h2>
		<code>
		//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 DirectionalLight and turn on shadows for the light
		var light = new THREE.DirectionalLight( 0xffffff, 1, 100 );
		light.position.set( 0, 1, 0 ); 			//default; light shining from top
		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 );
		</code>

		<h2>构造函数</h2>
		<h3>[name]( )</h3>
		<p>
			创建一个新的[name]，不能直接调用-它是在[page:DirectionalLight DirectionalLights]内部调用使用

		</p>

		<h2>属性</h2>
		<p>
			参阅[page:LightShadow LightShadow]类来了解常用的基本属性
		</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 />
		</p>

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

		<h2>源码</h2>

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