How would I go about creating a GUI-based night vision system?

Hi,

I’m trying to create a system that allows people to see in the dark through only particular parts of the screen/where the UI is visible. I found something similar to this idea, with a screenshot taken of it in development:


The screenshot, which is from Discord, had a caption attached by its creator discussing how it was created using beams. From here, I attempted to create my desired system using Camera:ScreenPointToRay, as seen here. However, this does not seem to create a beam big enough to produce the desired effect.

Any advice about how I should go forward?

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