Open an existing Minecraft world and place a wall of glass blocks inside a structure without direct access to the sky (no windows or other openings). The sky and clouds will be visible reflecting on the glass even though you are indoors and the sky is not visible. I don’t think you’d normally expect to see these reflections in an enclosed space.
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It’s possible it’s a limitation of the shader at present. The Render Dragon Features for Creators experimental toggle allows torches and lanterns to cast rays and shadows and these bounce correctly off glass, so there’s hope that this solution can be incorporated into Vibrant Visuals. Thanks for the input!
I’m not an expert on how the shaders work, but I think that’s just a limitation of the tech they decided use to implement the reflections (which I’m pretty sure is just a cube map). To my knowledge, they can’t run code to check if there is a ceiling through just shader files alone. But I could be wrong.