🧊 Flatland Cross-Sections of 3D Solids: 2D

2D Flatland view of a rotating Platonic solid or sphere sliced by a movable plane: see the slice polygon, its area and perimeter, and the area-versus-height curve whose integral returns the solid's volume.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install