feDiffuseLighting
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
滤镜光照一个图像，使用 alpha 通道作为隆起映射。结果图像，是一个 RGBA 不透明图像，取决于光的颜色、光的位置以及输入隆起映射的表面几何形状。
滤镜制造的光映射可以与一个纹理图像组合，使用<feComposite>滤镜的多重 arithmetic 操作。在应用纹理图案之前合加多个光映射可以模拟多重光源。
使用上下文
示例
以下示例演示了一个圆上的feDiffuseLighting元素的效果，演示了每种可用的光源，光的方向来自左上角。
html
<svg width="440" height="140" xmlns="http://www.w3.org/2000/svg">
<!-- No light is applied -->
<text text-anchor="middle" x="60" y="22">No Light</text>
<circle cx="60" cy="80" r="50" fill="green" />
<!-- the light source is a fePointLight element -->
<text text-anchor="middle" x="170" y="22">fePointLight</text>
<filter id="lightMe1">
<feDiffuseLighting in="SourceGraphic" result="light" lighting-color="white">
<fePointLight x="150" y="60" z="20" />
</feDiffuseLighting>
<feComposite
in="SourceGraphic"
in2="light"
operator="arithmetic"
k1="1"
k2="0"
k3="0"
k4="0" />
</filter>
<circle cx="170" cy="80" r="50" fill="green" filter="url(#lightMe1)" />
<!-- the light source is a feDistantLight element -->
<text text-anchor="middle" x="280" y="22">feDistantLight</text>
<filter id="lightMe2">
<feDiffuseLighting in="SourceGraphic" result="light" lighting-color="white">
<feDistantLight azimuth="240" elevation="20" />
</feDiffuseLighting>
<feComposite
in="SourceGraphic"
in2="light"
operator="arithmetic"
k1="1"
k2="0"
k3="0"
k4="0" />
</filter>
<circle cx="280" cy="80" r="50" fill="green" filter="url(#lightMe2)" />
<!-- the light source is a feSpotLight source -->
<text text-anchor="middle" x="390" y="22">feSpotLight</text>
<filter id="lightMe3">
<feDiffuseLighting in="SourceGraphic" result="light" lighting-color="white">
<feSpotLight
x="360"
y="5"
z="30"
limitingConeAngle="20"
pointsAtX="390"
pointsAtY="80"
pointsAtZ="0" />
</feDiffuseLighting>
<feComposite
in="SourceGraphic"
in2="light"
operator="arithmetic"
k1="1"
k2="0"
k3="0"
k4="0" />
</filter>
<circle cx="390" cy="80" r="50" fill="green" filter="url(#lightMe3)" />
</svg>
实时呈现：
属性
全局属性
专有属性
DOM 接口
该元素实现了 SVGFEDiffuseLightingElement 接口。