What is the different between boxBlur and kernelBlur in Blur ESM?

[Aze]

I don’t know what is the box means?If it means that the bounds texel?

[carolhmj]

Hello! boxBlur and kernelBlur are different post-processes applied to the shadow map. Kernel blur refers to the technique of using image kernels to transform images:

(source: Image Kernels explained visually (setosa.io))

While the box blur is kind like a special kernel blur where all pixels have the same weight: Amrita Mazumdar - Understanding Box Blur

[Aze]

Thanks~