The title of the Valve SIGGRAPH 2007 paper on signed distance fields (SDF) is important to pay attention to: "Improved Alpha-Tested Magnification of Vector Textures"...
Sure, but you can do that with regular antialiased bitmaps too. You just need to convert from pixel coverage to distance. It turns out that while not quite the same they’re highly correlated to within 5% (the formula is in WR actually, see distance_aa)
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Interesting. I didn't think it would work that well. So maybe we shouldn't bother with rasterizing transformed text in screen space when there is no sub-px aa
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Well, it’s just a hypothesis. Needs to be tested. I think the characteristic “wiggly sides” of alpha-tested magnified bitmaps are actually small graphs of pixel coverage vs. distance.
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