Extending Custom HLSL / Custom Expressions

[Iacopo_Antonelli]

@IronicParadox

Try throwing a:

#pragma once

at the top of your shader file. I make all sorts of custom shaders like these and use the include / return 0 custom node method for them in 4.19.2. If that doesn’t work, then check your shader code. Make sure you’re using the struct setup properly.

#pragma once

struct TestingMath
{
float TestFunction(float Ain, float Bin)
{
return Ain + Bin;
}
};

TestingMath TestName;
return TestName.TestFunction(A, B); //pin input names

Saved this file as TestMath.ush within the shaders/private/ folder. The include will be Engine/Private/TestMath.ush and don’t ask me why the directories don’t line up with the actual real folder structure. I just know it works this way…

Awesome, it works thanks!!

It would still be awesome if we could just add the include in one custom node and use the functions in the others like this…

Unfortunately it doesn’t work!

Code of the structure it’s just:

#pragma once
struct IacopoHlslFunctions
{
    float3 OrangeBright()
    {
        return float3(1, .7, 0);
    }
};    

IacopoHlslFunctions iacopoHlslFunctions;

I would expect the iacopoHlslFunctions variable to be added to the scope of the material, apparently it’s not.

This other code works fine, but every time you use a custom node (in the same material) you need to re-include the file, which I don’t understand why.

#include "/Engine/Private/iacopoHlslStructures.ush"
return iacopoHlslFunctions.OrangeBright();