1 files changed, 23 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/examples/trefoilknot.asy b/Build/source/utils/asymptote/examples/trefoilknot.asy
new file mode 100644
index 00000000000..fb10e3def0e
--- /dev/null
+++ b/Build/source/utils/asymptote/examples/trefoilknot.asy
@@ -0,0 +1,23 @@
+import tube;
+import graph3;
+import palette;
+currentlight=adobe;
+
+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));