diffuseConstant

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨January 2020��.

The diffuseConstant attribute represents the k_d value in the Phong lighting model. In SVG, this can be any non-negative number.

It's used to determine the final RGB value of a given pixel. The brighter the lighting-color, the smaller this number should be.

You can use this attribute with the following SVG elements:

<feDiffuseLighting>

Example

html,
body,
svg {
  height: 100%;
}

html

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
  <filter id="diffuseLighting1" x="0" y="0" width="100%" height="100%">
    <feDiffuseLighting in="SourceGraphic" diffuseConstant="1">
      <fePointLight x="60" y="60" z="20" />
    </feDiffuseLighting>
  </filter>
  <filter id="diffuseLighting2" x="0" y="0" width="100%" height="100%">
    <feDiffuseLighting in="SourceGraphic" diffuseConstant="2">
      <fePointLight x="60" y="60" z="20" />
    </feDiffuseLighting>
  </filter>

  <rect x="0" y="0" width="200" height="200" filter="url(#diffuseLighting1)" />
  <rect
    x="220"
    y="0"
    width="200"
    height="200"
    filter="url(#diffuseLighting2)" />
</svg>