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"...
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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Unfortunately the errors magnify when you do the conversion and you still get wiggly lines. :( Oh well.
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BTW I’m pretty sure you can generate SDF very quickly if you have the appropriate rasterizer. It’s just that few people do it that way.
End of conversation
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