Ex: Sinus
X= u*sin(u)+0.5*u
Y= u
Z= 0.5*u
0<= u <= 4*pi
rotacija oko y ose
x = 2*sin(u); y = u; z = 1; 0 <= u <= 3*pi;
x = sin(4*v); y = 1; z = v; 0<= v <=3*pi