Sharing functions accross shaders

Question

Is there a way to share functions or even constants like PI in way that avoid me of writing it up in every shader I make ?

Unquestionable

Answer 1

I asked essentially the same question some time ago and got no response. I don't think this is possible in Godot 3, but the #include statement in Godot 4 may do the trick:

https://github.com/godotengine/godot-proposals/issues/944

Undaunted