He made splines out of piecewise “spiro” curves (aka clothoids, Cornu spirals or Euler spirals), for which curvature changes linearly with arclength. This makes much smoother-looking curves than naive use of e.g. Bézier-curve segments, which he found made it much easier to trace or create nice looking letter glyphs for font design.
He made splines out of piecewise “spiro” curves (aka clothoids, Cornu spirals or Euler spirals), for which curvature changes linearly with arclength. This makes much smoother-looking curves than naive use of e.g. Bézier-curve segments, which he found made it much easier to trace or create nice looking letter glyphs for font design.