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Also here is a list of gamedev libs for Golang. Most are engine agnostic: https://github.com/sedyh/awesome-ebitengine
So you have a few different questions there. 1) Ebitenui is primarily game based and makes no assumptions on how the ui should look so you are required to provide the graphics for all the widgets. Fyne is great but more opinionated and focused on a desktop experience from what I've seen. 2) Ebitengine is a 2d game engine for go. 3) There is a lib built on top of ebitengine is ebitengine for 3d PS1 level graphics https://github.com/SolarLune/tetra3d 4) I think it could be done but this library isn't built for that. There are libraries for opengl bindings, raylib bindings and a dedicated 3d engine lib though that one looks to be a bit dead http://g3n.rocks/