Call Material function from Material Custom node

[Dismiss42 (James)]

How can I reference a relative file path in an #include in a custom node?

Hiyo! I’m attempting to smooth over the process of including HLSL files in my materials. So far what I’ve found is that I can store code for the Custom node in an HLSL file by adding in the custom node’s Code property: #include "C:/Shaders/ShaderCode.hlsl" return 0; As you can see, the path is literal, which introduces a lot of issues with packaging and source control. Is there any way for me to use a relative file path or macro to include these files in source control and packaging? Preferabl…

edit:
Actually that too is out of date.

There is currently, for me in UE 5.4, a setting/property on custom hlsl nodes for “Include File Paths”, which allows you to do this. Do not attempt to #include directly in your node’s code, it will not compile.

Also note, the path itself is in the style of what unreal calls a “virtual shader path”. It is a bit annoying to setup as you will need to actually register a folder and give it a name, in order for your headers placed there to be resolved correctly.