javascript
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three.js
镜像自地址 https://github.com/tazdij/three.js.git


			
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		<h1>[name]</h1>

		<p class="desc">
			Serves as a base class for the other shadow classes.
		</p>


		<h2>Constructor</h2>

		<h3>[name]( [param:Camera camera] )</h3>
		<p>
		[page:Camera camera] - the light's view of the world.<br /><br />

		Create a new [name]. This is not intended to be called directly - it is used as a base class by
		other light shadows.
		</p>

		<h2>Properties</h2>

		<h3>[property:Boolean autoUpdate]</h3>
		<p>
			Enables automatic updates of the light's shadow. Default is *true*.
			If you do not require dynamic lighting / shadows, you may set this to *false*.
		</p>

		<h3>[property:Camera camera]</h3>
		<p>
			The light's view of the world. This is used to generate a depth map of the scene; objects behind
			other objects from the light's perspective will be in shadow.
		</p>

		<h3>[property:Float bias]</h3>
		<p>
			Shadow map bias, how much to add or subtract from the normalized depth when deciding whether a surface is in shadow.<br />
			The default is 0. Very tiny adjustments here (in the order of 0.0001) may help reduce artefacts in shadows
		</p>

		<h3>[property:WebGLRenderTarget map]</h3>
		<p>
			The depth map generated using the internal camera; a location beyond a pixel's depth is
			in shadow. Computed internally during rendering.
		</p>

		<h3>[property:WebGLRenderTarget mapPass]</h3>
		<p>
			The distribution map generated using the internal camera; an occlusion is calculated based
			on the distribution of depths. Computed internally during rendering.
		</p>

		<h3>[property:Vector2 mapSize]</h3>
		<p>
			A [Page:Vector2] defining the width and height of the shadow map.<br /><br />

			Higher values give better quality shadows at the cost of computation time. Values must be
			powers of 2, up to the [page:WebGLRenderer.capabilities].maxTextureSize for a given device,
			although the width and height don't have to be the same (so, for example, (512, 1024) is valid).
			The default is *( 512, 512 )*.
		</p>

		<h3>[property:Matrix4 matrix]</h3>
		<p>
			Model to shadow camera space, to compute location and depth in shadow map. Stored
			in a [page:Matrix4 Matrix4]. This is computed internally during rendering.
		</p>

		<h3>[property:Boolean needsUpdate]</h3>
		<p>
			When set to *true*, shadow maps will be updated in the next *render* call. Default is *false*.
			If you have set [page:.autoUpdate] to *false*, you will need to set this property to *true* and then make a render call to update the light's shadow.
		</p>

		<h3>[property:Float normalBias]</h3>
		<p>
			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.
		</p>

		<h3>[property:Float radius]</h3>
		<p>
			Setting this to values greater than 1 will blur the edges of the shadow.<br />

			High values will cause unwanted banding effects in the shadows - a greater [page:.mapSize mapSize]
			will allow for a higher value to be used here before these effects become visible.<br />
			If [page:WebGLRenderer.shadowMap.type] is set to [page:Renderer PCFSoftShadowMap], radius has
			no effect and it is recommended to increase softness by decreasing [page:.mapSize mapSize] instead.<br /><br />

			Note that this has no effect if the [page:WebGLRenderer.shadowMap.type] is set to [page:Renderer BasicShadowMap].
		</p>


		<h2>Methods</h2>

		<h3>[method:Vector2 getFrameExtents]()</h3>
		<p>
		Used internally by the renderer to extend the shadow map to contain all viewports
		</p>

		<h3>[method:null updateMatrices]( [param:Light light] )</h3>
		<p>
		Update the matrices for the camera and shadow, used internally by the renderer.<br /><br />

		light -- the light for which the shadow is being rendered.
		</p>

		<h3>[method:Frustum getFrustum]()</h3>
		<p>
		Gets the shadow cameras frustum. Used internally by the renderer to cull objects.
		</p>

		<h3>[method:number getViewportCount]()</h3>
		<p>
		Used internally by the renderer to get the number of viewports that need to be rendered for this shadow.
		</p>

		<h3>[method:LightShadow copy]( [param:LightShadow source] )</h3>
		<p>
		Copies value of all the properties from the [page:LightShadow source] to this
		Light.
		</p>

		<h3>[method:LightShadow clone]()</h3>
		<p>
		Creates a new LightShadow with the same properties as this one.
		</p>

		<h3>[method:Object toJSON]()</h3>
		<p>
		Serialize this LightShadow.
		</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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