Interestingly, these erratic paths seem to happen on arcs that only have a bezier curve on one end. Paths that have two curved ends seem to render nicely.

Alright, I've confirmed that ensuring that each side of a point has a bezier curve will smooth the points, so it's an issue of how the icon is drawn. I can solve this issue myself, but since the svg looks different the the ttf, I'll let you decide if that's a bug.

TTF understands only quadratic beziers. Svg allows cubic.

cubic -> quad approximation algorythm is simplified, and can have deviations on edge cases. Usually, when you draw glyphs in font editor, it saves data with quadratic beziers, and you will never see this problem.

With current convertor i'd recommend to add more points. Or if anyone wish, he can rewrite this https://github.com/fontello/svg2ttf/blob/master/lib/math.js#L39-L75 cubic2quad function to something better.

Closed in flavour of #25.

PS. I have no plans to fix it myself, but if anyone wish - there are link to article with all details about math.

Thanks for the explanation @puzrin. I always learn a lot from opening issues on your repos 😃

@cameronmcefee FYI, after ages... fixed :)

🎉 Awesome!