Looking for a good Pixel Shader or Main Pixel Shader from Epic Games. Which file is it?

Development Rendering
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Hi,

i am creating a post process material and i want to extract the lightning, but when i divide PostProcessInput0 and Diffuse Color, i get dark areas at those pixes where the specular value is high.

I found a pixel shader and recreated it within the pp material but this one didnt come close to the unreal rendering.

Does anyone know a good pixel shader source or which file of the ue4 engine do i have to look in.

Thanks in advance