Adjust # lines, color, size. Mouse adjusts rotation Straight lines shows it's a "ruled" surface. Lines go in both directions ("doubly" ruled), but curves in 3D space
2D lines are straight, yet a make 3D curved surface I did a yet briefer version almost 2 years ago. It used less code, showed "ruled" surface but not "doubly ruled": https://scratch.mit.edu/projects/718360442/ but here I wanted to see how little code could make it "doubly ruled" (straight lines going in both directions). All done with xyz coordinates of -1 or 1 scaled up by size See my paraboloid in tetrahedron in cube to understand the underlying geometry Simple code
