cylinderical-egg-crate vec(cos(u),sin(u),v)+(.05*sin(30*u)*cos(30*v)*vec(cos(u),sin(u),0)) -3.14 3.14 0 1
spherical-egg_crate vec(cos(u)*sin(v),sin(u)*sin(v),cos(v))+(0.05*sin(30*u)*vec(-cos(u)*sin(v)*sin(v),cos(u)*cos(u)*sin(v)*cos(v)-sin(u)*sin(v)*sin(v),-sin(v)*cos(v))) 0 6.28 0 1
spherical-grooves vec(cos(u)*sin(v),sin(u)*sin(v),cos(v))+(0.03*sin(30*u)*vec(-cos(u)*sin(v)*sin(v),cos(u)*cos(u)*sin(v)*cos(v)-sin(u)*sin(v)*sin(v),-sin(v)*cos(v))) 0 6.28 0 1
spiral-ribbon vec(u*sin(v),u*cos(v),v/3) 0 1 0 1
moebius-band vec(cos(u)+v*cos(u/2)*cos(u),sin(u)+v*cos(u/2)*sin(u),v*sin(u/2)) 0 6.2831853071 -0.3 .3
roman-surface vec(sin(2*u)*cos(v)^2,sin(u)*sin(2*v),cos(u)*sin(2*v)) 0 3.14159265 -1.5707963267 1.5707963267
klein-bottle vec(cos(u)*(1+sin(v)*cos(u/2)-sin(2*v)*sin(u/2)/2),sin(u)*(1+sin(v)*cos(u/2)-sin(2*v)*sin(u/2)/2),sin(u/2)*sin(v)+cos(u/2)*sin(2*v)/2) -3.1417 3.1417 -3.1417 3.1417
jalebi vec(u*cos(u)*(4+cos(v+u)),u*sin(u)*(4+cos(v+u)),u*sin(v+u)) 0 12.54 0 6.28