When used for font rendering, signed distance fields are best understood as a *compression* technique, not a rendering algorithm at all.
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If you’re OK with the distortion above ~4x, then SDFs can be useful. But if you have hard quality bounds, then they’re just compression.
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The way they distort is certainly different (and much less awful) than raster scaling. A while back I saw an improvement on SDF that did better still.
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