Import
HorizontalBlurShader is an addon, and must be imported explicitly, see Installation#Addons.
import { HorizontalBlurShader } from 'three/addons/shaders/HorizontalBlurShader.js';Properties
.HorizontalBlurShader : ShaderMaterial~Shader (inner, constant)
Two pass Gaussian blur filter (horizontal and vertical blur shaders).
References:
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9 samples per pass
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standard deviation 2.7
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"h" and "v" parameters should be set to "1 / width" and "1 / height"