Well, there's my thesis :) There has been some work on this. Apple's Pages uses an implementation of the Hobby spline, demonstrating that it can be used in rea

Well, there's my thesis :) There has been some work on this. Apple's Pages uses an implementation of the Hobby spline, demonstrating that it can be used in real consumer products. I think if you put these two side-by-side though, mine comes out quite a bit better; when you push the Hobby spline you get curvature extrema quite a distance from the control points, and mine doesn't do that. Hobby's work has of course been an inspiration for mine for a long time, and it holds up academically quite well too - it has just the right blend of practical and aesthetic considerations and theoretical analysis; his solver runs in linear time and there's a proof it always converges (as long as tension values are within a reasonable range). And of course there's the k-Curve work from Adobe. I think it is a step forward from Hobby in some ways (more robust) but a step back in others (it's not as smooth and most especially doesn't form true inflections).