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kuligs2 idk if you can do this on modern lcd's.. adding scan lines is garbage.. you would think it makes sense but in reality is does not..
It's not just scanlines. The best CRT monitors had real good geometric/crystalline structure to the pixels. All of it could be emulated with a shader, but you'd need a really good monitor with good color gamut, brightness/contrast ratio and a very high resolution. Rendering SD and upscaling via CRT screen shader to 4K would borderline give enough pixels to work with to maybe decently emulate a CRT like look and feel.
But I suspect before 8K monitors become standard it'll still be a struggle. Each of the emulated CRT pixels would require enough pixels to truly emulate all the things happening to the light passing through the screen. Think aberration and diffraction effects too, not just scan lines and R G B W subpixel patterns.
Another thing before I forget it is that good CRT's had really great response times...