When we started authoring shaders we were experimenting until we found best practices that work for everyone, we have a good framework for that now that we can work towards the aim of the game's release.
We're aiming to rework all our built-in shaders to have a more unified pipeline, starting with the new glass shader, rewritten from scratch.
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Glass is much simpler to use and looks a ton better, taking proper physically based energy conservation into account, and you can layer other materials on top of it.