Modifying shader lighting calculations

[ionic dune]

Is there any way to modify how shaders calculate l ighting, or to create a new shader with custom lighting code, without doing engine changes? Or is this intrinsically an engine-change thing?

[agile dove]

Shaders have a light() function already. By default its commented out but you can uncomment it and replace the entire light function

https://docs.godotengine.org/en/stable/tutorials/shaders/shader_reference/spatial_shader.html