GraphEdit: Make connection shaders customizable

[MilheiroSantos]

Describe the project you are working on

I'm developing a game featuring an electronics circuit builder, and I've been prototyping whether I could use the GraphEdit Node to create the circuit part. I'd assume other projects may also need such a feature. For example, it would be nice to override the shaders to create animations. I'm okay with implementing the feature if it gets the go-ahead.

Describe the problem or limitation you are having in your project

In version 4.3, I'm able to override the line drawing algorithm by using the _get_connection_line function. I'm missing a similar functionality in GDscript to override the line shader.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

Creating a way to override the shader will allow me to create a custom pixelated theme to my game.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

The most straightforward way to enable this feature would be export the override_connections_shader function. Though I suspect there are good reasons why the function was not exported, as it relies on working well with the default line material.
We could also spend some time creating a new GraphConnection node and allow the material to be overridden there.

If this enhancement will not be used often, can it be worked around with a few lines of script?

I couldn't find a quick workaround.

Is there a reason why this should be core and not an add-on in the asset library?

Honestly, I'm not sure. I'll need to develop this functionality for my game. I believe in Open Source and the power of sharing. If you think the enhancements needed for my specific use-case benefit the community, I'm happy to contribute my time.

[sockeye-d]

I don't think the node graph system built into Godot is a good fit for your problem, you might consider making your own solution

[MilheiroSantos]

Thank you for your feedback and time. I'll then build my own solution.