20 Nov 2007

## Official Asymptote example – xxsq01x-1

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

import graph3;
import solids;
size(300);
currentprojection=perspective(0,2,10,up=Y);
currentlight=Viewport;

pen color=green;

real f(real x) {return x^2;}
pair F(real x) {return (x,f(x));}
triple F3(real x) {return (x,f(x),0);}

path p=graph(F,0,1,n=10,operator ..)--cycle;
path3 p3=path3(p);

revolution a=revolution(-X,p3,Y,0,180);
render render=render(merge=true);
draw(surface(a),color);
surface s=surface(p);
draw(s,color);
transform3 t=shift(-2X)*rotate(180,Y);
draw(t*s,color);
draw(p3);
draw(t*p3);

draw((-1,0,0)--(-1,1,0),dashed);
xaxis3(Label("\$x\$",1),Arrow3);
yaxis3(Label("\$y\$",1),Arrow3);
dot(Label("\$(1,1)\$"),(1,1,0));
dot(Label("\$(-1,1)\$"),(-1,1,0),W);
arrow("\$y=x^{2}\$",F3(0.7),X,1cm,red);
arrow("\$y=x\$",(0.3,0.3,0),X,1.5cm,red);
draw(circle((-1,1,0),2,Y),dashed);
draw((-1,1,0)--(1,1,0),dashed);
draw(shift(-X)*arc(0.02Y,0.3,90,0,0,0,CW),Arrow3);

```

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