A simple project demonstrating the use of shaders to make fancy lines in the Godot Engine.
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A HTML5 export of this project is hosted HERE, note that performance varies from broswser to browser (on my machine it runs flawlessly on Chrome but has performance issues on Firefox, but that may changing depending on your configuration) and is overall worse than native performance.
All textures inside textures/ where taken from AmbientCG and packed into the appropriate format using GIMP.