a.
ex. sinus
x = 1.2^sin(u)*5-cos(1.2*u)
y = cos(u/0.5)+sin(1.2*u)
z = u/1.8
0 <= u <=3*pi
rotacija oko z-ose.
b.
ex. sinus ex. sinus
x = cos(u)*1.5 x = sin(v)*1.5+cos(v/2)
y = sin(3+u)+cos(u) y = cos(v/2)*3
z = 3*u z = sin(v/2)
0 <= u <= 1.8*pi 0 <= v <= 5*pi
