19 Nov 2007

## Official Asymptote example – twistedtubes

 (Compiled with Asymptote version 2.14svn-r5318)
```/* This code comes from The Official Asymptote Gallery */

import graph3;
import palette;

size(300,300,keepAspect=true);

real w=0.4;

real f(triple t) {return sin(t.x);}
triple f1(pair t) {return (cos(t.x)-2cos(w*t.y),sin(t.x)-2sin(w*t.y),t.y);}
triple f2(pair t) {return (cos(t.x)+2cos(w*t.y),sin(t.x)+2sin(w*t.y),t.y);}
triple f3(pair t) {return (cos(t.x)+2sin(w*t.y),sin(t.x)-2cos(w*t.y),t.y);}
triple f4(pair t) {return (cos(t.x)-2sin(w*t.y),sin(t.x)+2cos(w*t.y),t.y);}

surface s1=surface(f1,(0,0),(2pi,10),8,8,Spline);
surface s2=surface(f2,(0,0),(2pi,10),8,8,Spline);
surface s3=surface(f3,(0,0),(2pi,10),8,8,Spline);
surface s4=surface(f4,(0,0),(2pi,10),8,8,Spline);

pen[] Rainbow=Rainbow();
s1.colors(palette(s1.map(f),Rainbow));
s2.colors(palette(s2.map(f),Rainbow));
s3.colors(palette(s3.map(f),Rainbow));
s4.colors(palette(s4.map(f),Rainbow));

defaultrender.merge=true;

draw(s1);
draw(s2);
draw(s3);
draw(s4);

```

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