Interactive web tool renders classic topological surfaces in hand-drawn ink style

A browser-based project reproduces mid-century mathematical illustration techniques—like those in Francis's 'A Topological Picture Book'—for 3D surfaces, using triangulated meshes, GPU-computed silhouettes, and curvature-based hatching to mimic pen-and-ink drawing. Users can rotate, zoom, and manipulate hand-lettered labels on interactive models, with strokes dynamically redrawn as the view changes.