conchiglia

Description

* ((0.2*(1-v/(2*pi))*(1+cos(u)) + 0.1) * cos(2*v))*6 + 4 * ((0.2*(1-v/(2*pi))*(1+cos(u)) + 0.1) * sin(2*v))*6+ 4 * (1*v/(2*pi) + 0.2*(1-v/(2*pi)) * sin(u))*6 - 6 * 0<u<=2*pi * 0<v<=2*pi