## Asymptote using graph3.asy – fig0010

Category: Asymptote,Examples 3D,graph3.asyPh. Ivaldi @ 3 h 11 min

 A Möbius strip of half-width with midcircle of radius and at height can be represented parametrically by: for in and in . In this parametrization, the Möbius strip is therefore a cubic surface with equation Source (Compiled with Asymptote version 2.14svn-r5318)

import graph3;
ngraph=200;
size(12cm,0);
currentprojection=orthographic(-4,-4,5);

real x(real t), y(real t), z(real t);

real R=2;
void xyzset(real s){
x=new real(real t){return (R+s*cos(t/2))*cos(t);};
y=new real(real t){return (R+s*cos(t/2))*sin(t);};
z=new real(real t){return s*sin(t/2);};
}

int n=ngraph;
real w=1;
real s=-w, st=2w/n;
path3 p;
triple[][] ts;
for (int i=0; i <= n; ++i) {
xyzset(s);
p=graph(x,y,z,0,2pi);

ts.push(new triple[] {});
for (int j=0; j <= ngraph; ++j) {
ts[i].push(point(p,j));
}
s += st;
}

pen[] pens={black, yellow, red, yellow, black};
draw(surface(ts, new bool[][]{}), lightgrey);
for (int i=0; i <= 4; ++i) {
xyzset(-w+i*w/2);
draw(graph(x,y,z,0,2pi), 2bp+pens[i]);
}



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## Asymptote using graph3.asy – fig0080

Category: Asymptote,Examples 3D,graph3.asyPh. Ivaldi @ 10 h 11 min

 (Compiled with Asymptote version 2.14svn-r5318)

// Adapted from the documentation of Asymptote.
import graph3;
import contour;
texpreamble("\usepackage{icomma}");

size3(12cm,12cm,8cm,IgnoreAspect);

real sinc(pair z) {
real r=2pi*abs(z);
return r != 0 ? sin(r)/r : 1;
}

limits((-2,-2,-0.2),(2,2,1.2));
currentprojection=orthographic(1,-2,0.5);

xaxis3(rotate(90,X)*"$x$",
Bounds(Min,Min),
OutTicks(rotate(90,X)*Label, endlabel=false));

yaxis3("$y$", Bounds(Max,Min), InTicks(Label));
zaxis3("$z$", Bounds(Min,Min), OutTicks());

draw(lift(sinc,contour(sinc,(-2,-2),(2,2),new real[] {0})), bp+0.8*red);
draw(surface(sinc,(-2,-2),(2,2),nx=100, Spline), lightgray);

draw(scale3(2*sqrt(2))*unitdisk, paleyellow+opacity(0.25), nolight);
draw(scale3(2*sqrt(2))*unitcircle3, 0.8*red);



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## Asymptote using graph3.asy – fig0090

Category: Asymptote,Examples 3D,graph3.asyPh. Ivaldi @ 11 h 11 min

 (Compiled with Asymptote version 2.14svn-r5318)

size(12cm,0,false);
import graph3;
import contour;
import palette;

texpreamble("\usepackage{icomma}");

real f(pair z) {return z.x*z.y*exp(-z.x);}

currentprojection=orthographic(-2.5,-5,1);

draw(surface(f,(0,0),(5,10),20,Spline),palegray,bp+rgb(0.2,0.5,0.7));

scale(true);

xaxis3(Label("$x$",MidPoint),OutTicks());
yaxis3(Label("$y$",MidPoint),OutTicks(Step=2));
zaxis3(Label("$z=xye^{-x}$",Relative(1),align=2E),Bounds(Min,Max),OutTicks);

real[] datumz={0.5,1,1.5,2,2.5,3,3.5};

Label[] L=sequence(new Label(int i) {
return YZ()*(Label(format("$z=%g$",datumz[i]),
align=2currentprojection.vector()-1.5Z,Relative(1)));
},datumz.length);

pen fontsize=bp+fontsize(10);
draw(L,lift(f,contour(f,(0,0),(5,10),datumz)),



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## Asymptote using graph3.asy – fig0110

Category: Asymptote,Examples 3D,graph3.asyPh. Ivaldi @ 13 h 11 min

 (Compiled with Asymptote version 2.14svn-r5318)

import graph3;
import palette;
import contour;
size(14cm,0);
currentprojection=orthographic(-1,-1.5,0.75);
currentlight=(-1,0,5);

real a=1, b=1;
real f(pair z) { return a*(6+sin(z.x/b)+sin(z.y/b));}
real g(pair z){return f(z)-6a;}

// The axes
limits((0,0,4a),(14,14,8a));
xaxis3(Label("$x$",MidPoint),OutTicks());
yaxis3(Label("$y$",MidPoint),OutTicks(Step=2));
ticklabel relativelabel()
{
return new string(real x) {return (string)(x-6a);};
}
zaxis3(Label("$z$",Relative(1),align=2E),Bounds(Min,Max),OutTicks(relativelabel()));

// The surface
surface s=surface(f,(0,0),(14,14),100,Spline);

// Draw the surface
draw(s,pens);
// Project the surface onto the XY plane.
draw(planeproject(unitsquare3)*s,pens,nolight);

// Draw contour for "datumz"
real[] datumz={-1.5, -1, 0, 1, 1.5};
guide[][] pl=contour(g,(0,0),(14,14),datumz);
for (int i=0; i < pl.length; ++i)
for (int j=0; j < pl[i].length; ++j)
draw(path3(pl[i][j]));

// Draw the contours on the surface
draw(lift(f,pl));

if(!is3D())
shipout(bbox(3mm,Fill(black)));



## Official Asymptote example – BezierPatch

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 7 h 57 min

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

import three;

size(10cm);
currentlight=Viewport;

surface s=surface(patch(new triple[][] {
{(0,0,0),(1,0,0),(1,0,0),(2,0,0)},
{(0,1,0),(1,0,1),(1,0,1),(2,1,0)},
{(0,1,0),(1,0,-1),(1,0,-1),(2,1,0)},
{(0,2,0),(1,2,0),(1,2,0),(2,2,0)}}));

draw(s,yellow);
draw(s.s[0].vequals(0.5),squarecap+2bp+blue,currentlight);
draw(s.s[0].uequals(0.5),squarecap+2bp+red,currentlight);



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## Official Asymptote example – fillcontour

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 5 h 57 min

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

import graph;
import palette;
import contour;

size(12cm,IgnoreAspect);

pair a=(pi/2,0);
pair b=(3pi/2,2pi);

real f(real x, real y) {return cos(x)*sin(y);}

int N=100;
int Divs=10;

defaultpen(1bp);

bounds range=bounds(-1,1);

real[] Cvals=uniform(range.min,range.max,Divs);
guide[][] g=contour(f,a,b,Cvals,N,operator --);

pen[] Palette=quantize(Rainbow(),Divs);

pen[][] interior=interior(g,extend(Palette,grey,black));
fill(g,interior);
draw(g);

palette("$f(x,y)$",range,point(SE)+(0.5,0),point(NE)+(1,0),Right,Palette,
PaletteTicks("$%+#0.1f$",N=Divs));



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## Official Asymptote example – imagecontour

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 6 h 57 min

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

import graph;
import palette;
import contour;

size(10cm,10cm,IgnoreAspect);

pair a=(0,0);
pair b=(2pi,2pi);

real f(real x, real y) {return cos(x)*sin(y);}

int N=200;
int Divs=10;
int divs=2;

defaultpen(1bp);
pen Tickpen=black;
pen tickpen=gray+0.5*linewidth(currentpen);
pen[] Palette=BWRainbow();

bounds range=image(f,Automatic,a,b,N,Palette);

// Major contours

real[] Cvals=uniform(range.min,range.max,Divs);
draw(contour(f,a,b,Cvals,N,operator --),Tickpen);

// Minor contours
real[] cvals;
for(int i=0; i < Cvals.length-1; ++i)
cvals.append(uniform(Cvals[i],Cvals[i+1],divs)[1:divs]);
draw(contour(f,a,b,cvals,N,operator --),tickpen);

xaxis("$x$",BottomTop,LeftTicks,above=true);
yaxis("$y$",LeftRight,RightTicks,above=true);

palette("$f(x,y)$",range,point(NW)+(0,0.5),point(NE)+(0,1),Top,Palette,
PaletteTicks(N=Divs,n=divs,Tickpen,tickpen));



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## Official Asymptote example – impact

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 8 h 57 min

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

// Contributed by Philippe Ivaldi.
// http://www.piprime.fr/

import graph3 ;
import contour;
size (6cm,0);
currentprojection=orthographic(1,1,1) ;

real rc=1, hc=2, c=rc/hc;
draw(shift(hc*Z)*scale(rc,rc,-hc)*unitcone,blue);

triple Os=(0.5,0.5,1);
real r=0.5;
draw(shift(Os)*scale3(r)*unitsphere,red);

real a=1+1/c^2;
real b=abs(Os)^2-r^2;

real f(pair z)
{
real x=z.x, y=z.y;
return a*x^2-2*Os.x*x+a*y^2-2*Os.y*y-2*Os.z*sqrt(x^2+y^2)/c+b;
}

real g(pair z){return (sqrt(z.x^2+z.y^2))/c;}

draw(lift(g,contour(f,(-rc,-rc),(rc,rc),new real[]{0})),linewidth(2bp)+yellow);

axes3("$x$","$y$","$z$",Arrow3);



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## Official Asymptote example – logimage

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 12 h 57 min

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

import graph;
import palette;

size(10cm,10cm,IgnoreAspect);

real f(real x, real y) {
return 0.9*pow10(2*sin(x/5+2*y^0.25)) + 0.1*(1+cos(10*log(y)));
}

scale(Linear,Log,Log);

pen[] Palette=BWRainbow();

bounds range=image(f,Automatic,(0,1),(100,100),nx=200,Palette);

xaxis("$x$",BottomTop,LeftTicks,above=true);
yaxis("$y$",LeftRight,RightTicks,above=true);

palette("$f(x,y)$",range,(0,200),(100,250),Top,Palette,
PaletteTicks(ptick=linewidth(0.5*linewidth())));



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## Official Asymptote example – projectelevation

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 23 h 57 min

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

import graph3;
import grid3;
import palette;

currentprojection=orthographic(0.8,1,2);
size(400,300,IgnoreAspect);

real f(pair z) {return cos(2*pi*z.x)*sin(2*pi*z.y);}

surface s=surface(f,(-1/2,-1/2),(1/2,1/2),50,Spline);

surface S=planeproject(unitsquare3)*s;
S.colors(palette(s.map(zpart),Rainbow()));
draw(S,nolight);
draw(s,lightgray+opacity(0.7));

grid3(XYZgrid);



## Official Asymptote example – sinc

Category: Asymptote,Official Gallery One-PagerPh. Ivaldi @ 20 h 57 min

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

import graph3;
import contour;

currentprojection=orthographic(1,-2,1);
currentlight=White;

size(12cm,0);

real sinc(pair z) {
real r=2pi*abs(z);
return r != 0 ? sin(r)/r : 1;
}

render render=render(compression=Low,merge=true);

draw(lift(sinc,contour(sinc,(-2,-2),(2,2),new real[] {0})),red);
draw(surface(sinc,(-2,-2),(2,2),Spline),lightgray,render);

draw(scale3(2*sqrt(2))*unitdisk,paleyellow+opacity(0.25),nolight,render);
draw(scale3(2*sqrt(2))*unitcircle3,red,render);

xaxis3("$x$",Bounds,InTicks);
yaxis3("$y$",Bounds,InTicks(beginlabel=false));
zaxis3("$z$",Bounds,InTicks);



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