import tube;
import graph3;

size(7.5cm,0);

currentprojection=perspective(10,5,12);
currentlight=light(8,10,2);

path3 g1=(0,0,0)--(1,0,0)..(1,1,0)..cycle;
surface tb1=tube(g1,scale(.1)*unitcircle);
draw(tb1,blue);

path3 g2=(0,0,0)--(1,0,0)--(1,1,0)..cycle;
surface tb2=tube(g2,scale(.1)*polygon(3));
draw(shift(Z)*tb2,green);

limits((-1,-1,-1),(1.5,1.5,1.5));
xaxis3("$x$",Arrow3);
yaxis3("$y$",Arrow3);
zaxis3("$z$",Arrow3);