---

title: SpotLightShadow

<Grid cols={4}> <li> <Codesandbox id="yyk6gv" /> </li> </Grid>

A shadow caster that can help cast shadows of different patterns (textures) onto the scene.

<SpotLight>
  <SpotLightShadow
    distance={0.4} // Distance between the shadow caster and light
    alphaTest={0.5} // Sets the alpha value to be used when running an alpha test. See Material.alphaTest
    scale={1} //  Scale of the shadow caster plane
    map={undefined} // Texture - Pattern of the shadow
    shader={undefined} // Optional shader to run. Lets you add effects to the shadow map. See bellow
    width={512} // Width of the shadow map. The higher the more expnsive
    height={512} // Height of the shadow map. The higher the more expnsive
  />
</SpotLight>

An optional shader prop lets you run a custom shader to modify/add effects to your shadow texture. The shader provides the following uniforms and varyings.

| Type | Name | Notes | | ------------------- | ------------ | -------------------------------------- | | varying vec2 | vUv | UVs of the shadow casting plane | | uniform sampler2D | uShadowMap | The texture provided to the map prop | | uniform float | uTime | Current time |

Treat the output of the shader like an alpha map where 1 is opaque and 0 is transparent.

gl_FragColor = vec4(vec3(1.), 1.); // Opaque
gl_FragColor = vec4(vec3(0.), 1.); // Transparent