Why distance field text rendering have clear outline?

Posted by jinhwan on Game Development See other posts from Game Development or by jinhwan
Published on 2014-05-31T03:42:07Z Indexed on 2014/05/31 3:56 UTC
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shaders

http://www.valvesoftware.com/publications/2007/SIGGRAPH2007_AlphaTestedMagnification.pdf

All the process for doing distance rendering is clear, but 'how does it work' is not clear for me.
It looks like that distance field pixels which are created around original pixel may affect 2d texture sampling interpolation process. But I can't understand the interpolation process. I've read that the distance field rendering is processed under nearest-neighbour interpolation. If it is true, shouldn't the distance field redering creates non interpolated result? In my thought, they should looks liked retro style pixel art. Where do i misunderstand in this process? So far, It is no difference with alpha test for me. Both of them throw away all pixcel which are not in. How does extra distance field pixel affect rendering under nearest-neighbour interpolation?

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