[R] parametric surfaces

[vtas@uosis.mif.vu.lt]

Hi,
does anyone know how to plot 3D parametric surface,e.g ellipsoid:
x=a*cos(s)*cos(t),
y=b*sin(s)*cos(t),
z=sin(t);
s in [0,2*pi],
t in [-pi,pi].

Vytautas Maniusis,
Vilnius University, Lithuania