%k3dsurf Helicoidal input mp-solid %1'' figureespace(-10u,-10u,10u,10u); Initialisation(1000,-40,10,10); incolor:=gris; arcenciel:=true; draw Sparam("(sh(v)*sin(u),-sh(v)*cos(u),3*u)",pi,-pi+0.2513,-0.2513,-pi,pi,0.2513); finespace; end