## Asymptote using three.asy – fig0070

Category: Asymptote,Examples 3D,three.asyPh. Ivaldi @ 20 h 50 min

 (Compiled with Asymptote version 2.14svn-r5318)

// From the Asymptote forum
import bsp;

typedef path3[] shape;

shape operator *(transform3 T, shape p){
shape os;
for(path3 g:p) os.push(T*g);
return os;
}

path3 path(triple[] T){
path3 P;
for(triple i:T) P=P--i;
return P;
}

void addshapes(face[] F, shape[] shp, pen drawpen=currentpen, pen fillpen=white)
{
for(int i=0; i < shp.length; ++i)
for(int j=0; j < shp[i].length; ++j) {
path3 g=shp[i][j];
picture pic=F.push(g);
filldraw(pic,project(g),fillpen, drawpen);
// filldraw(pic,g,currentlight.intensity(F[F.length-1].point)*fillpen, drawpen);
}
}

shape cylinder(real R=1, real H=1, int n=18){
shape Cyl;
triple[] CTop;
triple[] CBot;
for(int i=0; i <= n; ++i)
CBot.push((R*cos(2pi*i/n), R*sin(2pi*i/n),0));
CTop = CBot+(0,0,H);
for(int i=0; i < n; ++i)
Cyl.push(CBot[i]--CBot[i+1]--CTop[i+1]--CTop[i]--cycle);

path3 P=path(CBot)--cycle;
Cyl.push(P);
Cyl.push(shift(H*Z)*P);

return Cyl;
}

shape rightslab(real x=1, real y=1, real z=1){
shape slab;
slab[0] = (0,0,0)--(1,0,0)--(1,1,0)--(0,1,0)--cycle;
slab[1] = (0,0,0)--(1,0,0)--(1,0,1)--(0,0,1)--cycle;
slab[2] = (1,0,0)--(1,1,0)--(1,1,1)--(1,0,1)--cycle;
slab[3] = (1,1,0)--(0,1,0)--(0,1,1)--(1,1,1)--cycle;
slab[4] = (0,1,0)--(0,0,0)--(0,0,1)--(0,1,1)--cycle;
slab[5] = (0,0,1)--(1,0,1)--(1,1,1)--(0,1,1)--cycle;
return scale(x,y,z)*slab;
}

size(10cm,0);
triple cam=(1600,200,150);
//currentprojection=orthographic(1600,800,400);
currentprojection=perspective(cam); //Far away!
currentlight=rotate(-45,Z)*(cam+(0,0,1000));

real Blen = 180;
real Bwdt = 30;
real Bhgt = 3;
real Clen = 130;
real Cwdt = 50;
real Chgt = 50;
real cylr = 7.5;
real cylh = 37.0 ;

shape slab1 = shift(-Bwdt/2*Y-Bhgt/2*Z+Clen/2*X)*rightslab(Blen,Bwdt,Bhgt);
shape slab2 = shift(-Cwdt/2*Y-Chgt/2*Z-Clen/2*X)*rightslab(Clen,Cwdt,Chgt);
shape cyl1 = shift((Blen+Clen/2-2*cylr)*X-(cylh/2)*Z)*cylinder(R=cylr, H=cylh);

shape[] group1={slab1};
shape[] group2={slab2};
shape[] group3={cyl1};

face[] faces;
addshapes(faces, group1, drawpen=linewidth(0.25bp), fillpen=opacity(0.35)+red);
addshapes(faces, group2, drawpen=linewidth(0.25bp), fillpen=opacity(0.5)+lightblue);
addshapes(faces, group3, drawpen=linewidth(0.25bp), fillpen=opacity(0.5)+lightyellow);

shipout(format="pdf", bbox(3mm,white));



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## Asymptote using three.asy – fig0080

Category: Asymptote,Examples 3D,three.asyPh. Ivaldi @ 21 h 50 min

 (Compiled with Asymptote version 2.14svn-r5318)

import bsp;

typedef path3[] shape;

shape operator *(transform3 T, shape p){
shape os;
for(path3 g:p) os.push(T*g);
return os;
}

path3 path(triple[] T){
path3 P;
for(triple i:T) P=P--i;
return P;
}

void addshapes(face[] F, shape[] shp, pen drawpen=currentpen, pen fillpen=white)
{
for(int i=0; i < shp.length; ++i)
for(int j=0; j < shp[i].length; ++j) {
path3 g=shp[i][j];
picture pic=F.push(g);
if(fillpen != nullpen) filldraw(pic,project(g),fillpen, drawpen);
else draw(pic,project(g),drawpen);
// filldraw(pic,g,currentlight.intensity(F[F.length-1].point)*fillpen, drawpen);
}
}

shape cylinder(real R=1, real H=1, int n=18){
shape Cyl;
triple[] CTop;
triple[] CBot;
for(int i=0; i <= n; ++i)
CBot.push((R*cos(2pi*i/n), R*sin(2pi*i/n),0));
CTop = CBot+(0,0,H);
for(int i=0; i < n; ++i)
Cyl.push(CBot[i]--CBot[i+1]--CTop[i+1]--CTop[i]--cycle);

path3 P=path(CBot)--cycle;
Cyl.push(P);
Cyl.push(shift(H*Z)*P);

return Cyl;
}

size(10cm,0);

currentprojection=orthographic(1,1,1);

shape cyl1 = cylinder(R=1, H=2);

shape[] group={cyl1};

face[] hidden, visible;
addshapes(visible, group, drawpen=dotted, fillpen=nullpen);

shipout(format="pdf");



Étiquettes : , , ,

## Asymptote using three.asy – fig0090

Category: Asymptote,Examples 3D,three.asyPh. Ivaldi @ 22 h 50 min

 (Compiled with Asymptote version 2.14svn-r5318)

size(10cm,0);
import three;

currentprojection=obliqueX;

triple v1=(4,0,0),
v2=(0,6,0),
p0=(-2,-3,0);
path3 pl1=plane(v1,v2,p0);

path ph=transform(v1,v2,p0,currentprojection)*((0,-2){W}..(0,2){W}..cycle);
filldraw(project(pl1)^^ph,evenodd+lightgrey);



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## Asymptote using three.asy – fig0100

Category: Asymptote,Examples 3D,three.asyPh. Ivaldi @ 23 h 50 min

 (Compiled with Asymptote version 2.14svn-r5318)

size(12cm,0);
import bsp;

currentprojection=orthographic(1,1.5,1);

path3 xy=plane((1,0,0),(0,1,0),(0,0,0));
path3 xz=rotate(90,X)*xy;
path3 yz=rotate(-90,Y)*xy;

face[] f;
filldraw(f.push(xy),project(xy),grey);
filldraw(f.push(xz),project(xz),grey);
filldraw(f.push(yz),project(yz),grey);

draw(Label("$x$",EndPoint), O--(1,0,0), Arrow3);
draw(Label("$y$",EndPoint), O--(0,1,0), Arrow3);
draw(Label("$z$",EndPoint), O--(0,0,1), Arrow3);
dot(O);

path[] ph=texpath("$\displaystyle\int_{-\infty}^{+\infty}e^{-\alpha x^2}\,dx= \sqrt{\frac{\pi}{\alpha}}$");
ph =shift((0.5,0.5))*rotate(-45)*scale(1/abs(min(ph)-max(ph)))*ph;

filldraw(project(path3(ph,XYplane)),0.8*yellow);
filldraw(project(path3(ph,ZXplane)),0.8*yellow);
filldraw(project(path3(ph,YZplane)),0.8*yellow);



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## Asymptote using three.asy – fig0110

Category: Asymptote,Examples 3D,three.asyPh. Ivaldi @ 0 h 50 min

 (Compiled with Asymptote version 2.14svn-r5318)

import three;
size(10cm,0);
currentprojection=orthographic(1,1.5,1);

path3 xy=XY*unitsquare3, xz=ZX*unitsquare3, yz=YZ*unitsquare3;

draw(xy^^xz^^yz, grey);
path3 p3xy=path3(texpath("$\pi$")[0],XYplane);
p3xy=shift((0.5,0.5,0))*scale3(1/abs(min(p3xy)-max(p3xy)))*p3xy;

surface s=surface(p3xy,planar=true);
draw(s, surfacepen=blue, meshpen=orange+3pt);

transform3 Txz=planeproject(xz,(0,-1,1));
draw(Txz*s, red);

transform3 Tyz=planeproject(yz,(-1,0,1));
draw(Tyz*s, green);

path3 p3xz=Txz*p3xy;
path3 p3yz=Tyz*p3xy;

int lg=length(p3xy);
triple p;
for(int i=0;i<=lg;++i) {
p=point(p3xy,i);
draw(p--point(p3xz,i), yellow);
draw(p--point(p3yz,i), orange);
}



Étiquettes : , , , ,

## Asymptote using solids.asy – fig0010

Category: Asymptote,Examples 3D,solids.asyPh. Ivaldi @ 2 h 56 min

 (Compiled with Asymptote version 2.14svn-r5318)

import solids;
currentprojection=orthographic(1,2,2);

size(6cm,0);
material m=
//       diffusepen, ambientpen, emissivepen,  specularpen
material(  grey,       yellow,     black,        orange);

draw(surface(sphere(1)), m);



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## Asymptote using solids.asy – fig0020

Category: Asymptote,Examples 3D,solids.asyPh. Ivaldi @ 3 h 56 min

 (Compiled with Asymptote version 2.14svn-r5318)

import solids;
currentlight=light(paleyellow, viewport=false,
(5,-5,10),(0,0,-10));

size(6cm,0);
draw(sphere(1,n=4*nslice), linewidth(bp), m=10);
draw(surface(sphere(1,n=4*nslice)), orange);



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## Asymptote using solids.asy – fig0030

Category: Asymptote,Examples 3D,solids.asyPh. Ivaldi @ 4 h 56 min

 (Compiled with Asymptote version 2.14svn-r5318)

// Author: John Bowman.
size(6cm,0);
import solids;
currentprojection=orthographic(0,10,5);

nslice=4*nslice;

revolution r=sphere(O,1);
draw(surface(r), lightgrey+opacity(0.75));

skeleton s;
r.transverse(s,reltime(r.g,0.6));
r.transverse(s,reltime(r.g,0.5));
draw(s.transverse.back,linetype("8 8",8));
draw(s.transverse.front);

r.longitudinal(s);
draw(s.longitudinal.front);
draw(s.longitudinal.back,linetype("8 8",8));



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## Asymptote using solids.asy – fig0040

Category: Asymptote,Examples 3D,solids.asyPh. Ivaldi @ 5 h 56 min

 (Compiled with Asymptote version 2.14svn-r5318)

import solids;
size(6cm,0);

currentprojection=orthographic(100,150,30);

real r=1;

skeleton s;
revolution sph=sphere(O,r);
draw(surface(sph), palegray);

path3 cle=rotate(90,X)*scale3(r)*unitcircle3;

triple cam=unit(currentprojection.camera);
real a=degrees(xypart(cam),false)-90;
real b=-sgn(cam.z)*aCos(sqrt(cam.x^2+cam.y^2)/abs(cam));
cle=rotate(b,cross(Z,cam))*rotate(a,Z)*cle;
draw(cle,4pt+red);



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## Asymptote using solids.asy – fig0050

Category: Asymptote,Examples 3D,solids.asyPh. Ivaldi @ 6 h 56 min

 (Compiled with Asymptote version 2.14svn-r5318)

import solids;
size(6cm,0);
currentlight=light(diffuse=yellow, ambient=blue, specular=paleyellow,
specularfactor=0, viewport=false,(5,-5,10));
// currentprojection=orthographic(100,100,30);
real r=2;

skeleton s;
revolution sph=sphere(O,r);
draw(surface(sph),red);

triple cam=unit(currentprojection.camera);
revolution cle=revolution(O,r*(rotate(90,Z)*cam),cam);
draw(cle, 8pt+black);



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