/* Author: Jens Schwaiger */
settings.render=0;
import tube_js;

size(10cm,0);
currentprojection=perspective(4,3,4);
real x(real t) {return (1/sqrt(1+0.5*t^2))*cos(2pi*t);}
real y(real t) {return (1/sqrt(1+0.5*t^2))*sin(2pi*t);}
real z(real t) {return 0.9*t;}

path3 p=graph(x,y,z,0,2.7,Spline);

draw(spacetube(p,100,16), orange, 1bp+black);