<feDiffuseLighting>

<feblend>
<fecolormatrix>
<fecomponenttransfer>
<fecomposite>
<feconvolvematrix>
<fediffuselighting>
<fedisplacementmap>
<feflood>
<fefunca>
<fefuncb>
<fefuncg>
<fefuncr>
<fegaussianblur>
<feimage>
<femerge>
<femergenode>
<femorphology>
<feoffset>
<fepointlight>
<fespecularlighting>
<fespotlight>
<fetile>
<feturbulence>
SVG 元素
1. A
2. B-C
3. D
  1. <defs>
  2. <desc>
4. E
  1. <ellipse>
5. F
6. G
7. H
  1. <hkern>
8. I
  1. <image>
9. J-L
  1. <line>
  2. <linearGradient>
10. M
11. N-P
12. Q-R
  1. <radialGradient>
  2. <rect>
13. S
  1. <script>
  2. <set>
  3. <stop>
  4. <style>
  5. <svg>
  6. <switch>
  7. <symbol>
14. T
15. U
  1. <use>
16. V-Z
  1. <view>
  2. <vkern>

<feDiffuseLighting> SVG filter primitive lights an image using the alpha channel as a bump map. The resulting image, which is an RGBA opaque image, depends on the light color, light position and surface geometry of the input bump map.

The light map produced by this filter primitive can be combined with a texture image using the multiply term of the arithmetic operator of the <feComposite> filter primitive. Multiple light sources can be simulated by adding several of these light maps together before applying it to the texture image.

Usage context

类别	Filter primitive element
准许内容	Any number of descriptive elements and exactly one light source element , in any order.

<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>