Coordinates: Spherical
Function:a(u,v,t)=6*sin(u)*cos(u)+sin(t)
b(u,v,t)=cos(u)
R(u,v,t)=2+cos(t)*tan(v)
Domain of variables:
min U:-10 max U:20 steps:120
min V:-10 max V:10 steps:40