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import graph3;
size(200,0);
currentprojection=orthographic(4,0,2);
real R=2;
real a=1.9;
triple f(pair t) {
return ((R+a*cos(t.y))*cos(t.x),(R+a*cos(t.y))*sin(t.x),a*sin(t.y));
}
pen p=rgb(0.2,0.5,0.7);
surface s=surface(f,(0,0),(2pi,2pi),8,8,Spline);
// surface only
//draw(s,lightgray);
// mesh only
// draw(s,nullpen,meshpen=p);
// surface & mesh
draw(s,lightgray,meshpen=p,render(merge=true));
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