Parametric Grid Curve on 3D Surfaces A single parametric curve q(t) = (x(t), y(t)) that traces an entire 2D grid without lifting the pen, then mapped onto 3D surfaces like spheres and tori. On the left, the surface rotates in 3D showing the grid wrapped around it. On the right, the x(t) and y(t) components update in real time as the surface rotates. The challenge was finding a closed-form parametric function that draws a complete grid as one continuous path. code










