Question Where can I find the source code of the Vert and Frag in HDRP lit shader?

Inside the HDRP lit shader, there are

#pragma vertex Vert

and

#pragma fragment Frag

but no definitions. I assume they are predefined, but I can't find them in all libraries included. Where are they?

 

That depends on the pass, since it will do (at least) 2 passes, not counting debug/picking/meta passes, shadow passes, etc, etc, etc. It also might be forward or deferred depending on various configuration options. For example, the deferred G-Buffer fragment pass will start here:

https://github.com/Unity-Technologi...derPipeline/ShaderPass/ShaderPassGBuffer.hlsl

That doesn't do much on its own though since it relies on other functions having been included/defined before it's included. Eg the fragment pass there will want GetSurfaceAndBuiltinData which is defined differently for different surfaces. For a Lit shader, that's probably defined somewhere in here...

https://github.com/Unity-Technologi...-definition/Runtime/Material/Lit/LitData.hlsl

That's going to reference a bunch of other files. There's probably 30,000 lines of HLSL code included in various places/ways.

 

Thanks for the valuable information. You are right, they are pass-dependent. I haven't yet looked up all passes, but most of them are under HDRP/Runtime/RenderPipeline/ShaderPass