SVG <feDiffuseLighting> Filter
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What is <feDiffuseLighting> Filter?
The <feDiffuseLighting> SVG filter primitive lights an image using the alpha channel as a bump map. The output image, which is an RGBA opaque image, depends on the light position, light color and surface geometry of the input bump map.
Example
HTML Online Editor
<!DOCTYPE html>
<html lang="en-US">
<body>
<svg width="450" height="150" 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="#339933" />
<!-- the light source is a fePointLight element -->
<text text-anchor="middle" x="170" y="22">fePointLight</text>
<filter id="point">
<feDiffuseLighting in="SourceGraphic" result="light" lighting-color="white">
<fePointLight x="150" y="60" z="30" />
</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="#339933" filter="url(#point)" />
<!-- the light source is a feDistantLight element -->
<text text-anchor="middle" x="280" y="22">feDistantLight</text>
<filter id="point1">
<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="#339933" filter="url(#point1)" />
<!-- the light source is a feSpotLight source -->
<text text-anchor="middle" x="390" y="22">feSpotLight</text>
<filter id="point2">
<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="#339933" filter="url(#point2)" />
</svg>
</body>
</html>
Attributes Value
| Attribute | Explanation |
|---|---|
| in | Specifies the input for the given filter primitive. |
| surfaceScale | Specifies the height of the surface for a light filter primitive. |
| diffuseConstant | Specifies the kd value in the Phong lighting model. |
| kernelUnitLength | Specifies the intended distance in current filter units. |
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