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import tube;
import graph3;
import palette;
currentlight=White;
size(0,8cm);
currentprojection=perspective(1,1,1,up=-Y);
int e=1;
real x(real t) {return cos(t)+2*cos(2t);}
real y(real t) {return sin(t)-2*sin(2t);}
real z(real t) {return 2*e*sin(3t);}
path3 p=scale3(2)*graph(x,y,z,0,2pi,50,operator ..)&cycle;
pen[] pens=Gradient(6,red,blue,purple);
pens.push(yellow);
for (int i=pens.length-2; i >= 0 ; --i)
pens.push(pens[i]);
path sec=scale(0.25)*texpath("$\pi$")[0];
coloredpath colorsec=coloredpath(sec, pens,colortype=coloredNodes);
draw(tube(p,colorsec),render(merge=true));
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