Smooth Zig Zag ran the ridge points through a Catmull-Rom spline. Its end tangents slant across the path, and where the ridges are taller than about twice their spacing the sharp-turn floor of turn_tangent lengthens the handles, so the result read as straight diagonals with rounded tips. Each peak and valley is now a smooth point whose handles run along the path, a third of the way to the neighbouring ridge, so every span follows a half cosine through the path.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>