Les fichiers proposés sont le résultat d'une correspondance avec Zbigniew Nitecki.
Il existe, bien sûr, d'autres façons de procéder et il est difficile d'être exhaustif.
Section elliptique :
\documentclass{article}
\usepackage{pst-solides3d}
\begin{document}
\begin{center}
\begin{pspicture}(-4,-5)(4,5)
\psset{lightsrc=viewpoint}
\psset{viewpoint=100 30 20 rtp2xyz,Decran=100}
\psSolid[object=grille,base=-4 4 -4 4,linecolor={[rgb]{0.72 0.72 0.5}}](0,0,-3)
\psSolid[object=cone,h=3,r=3,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50,
ngrid=9 30](0,0,-3)
\psset{solidmemory}
\psSolid[object=cone,h=3,r=3,
plansepare={[0 0.5 1 -1.30]},
name=ConeB,
RotY=180,
ngrid=9 30,
action=none](0,0,3)
\psSolid[object=load,
load=ConeB1,
hollow,rm=0,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50]
\psSolid[object=plan,definition=equation,
args={[0 0.5 1 -1.3]},
base=-3 3 -3 3,
action=draw]
\defFunction[algebraic]{ellipse}(t)%
{1.3*cos(t)/(1+0.5*sin(t))}{1.3*sin(t)/(1+0.5*sin(t))} {1.3/(1+0.5*sin(t))}
\psSolid[object=courbe,
r=0,
range=0 6.28,
linecolor=blue,
linewidth=1.5\pslinewidth,
function=ellipse
]%
\axesIIID(0,0,1.3)(5,5,7)
\end{pspicture}
\end{center}
\end{document}
Section parabolique :\usepackage{pst-solides3d}
\begin{document}
\begin{center}
\begin{pspicture}(-4,-5)(4,5)
\psset{lightsrc=viewpoint}
\psset{viewpoint=100 30 20 rtp2xyz,Decran=100}
\psSolid[object=grille,base=-4 4 -4 4,linecolor={[rgb]{0.72 0.72 0.5}}](0,0,-3)
\psSolid[object=cone,h=3,r=3,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50,
ngrid=9 30](0,0,-3)
\psset{solidmemory}
\psSolid[object=cone,h=3,r=3,
plansepare={[0 0.5 1 -1.30]},
name=ConeB,
RotY=180,
ngrid=9 30,
action=none](0,0,3)
\psSolid[object=load,
load=ConeB1,
hollow,rm=0,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50]
\psSolid[object=plan,definition=equation,
args={[0 0.5 1 -1.3]},
base=-3 3 -3 3,
action=draw]
\defFunction[algebraic]{ellipse}(t)%
{1.3*cos(t)/(1+0.5*sin(t))}{1.3*sin(t)/(1+0.5*sin(t))} {1.3/(1+0.5*sin(t))}
\psSolid[object=courbe,
r=0,
range=0 6.28,
linecolor=blue,
linewidth=1.5\pslinewidth,
function=ellipse
]%
\axesIIID(0,0,1.3)(5,5,7)
\end{pspicture}
\end{center}
\end{document}
\documentclass{article}
\usepackage{pst-solides3d}
\begin{document}
\begin{center}
\begin{pspicture}(-4,-5)(4,5)
\psset{lightsrc=viewpoint}
\psset{viewpoint=100 30 20 rtp2xyz,Decran=100}
\psSolid[object=grille,base=-4 4 -4 4,linecolor={[rgb]{0.72 0.72 0.5}}](0,0,-3)
\psSolid[object=cone,h=3,r=3,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50,
grid,
ngrid=9 30](0,0,-3)
\psset{solidmemory}
\psSolid[object=cone,h=3,r=3,
rm=0,
plansepare={[0 1 1 -1.30]},
name=ConeB,
RotY=180,
ngrid=9 30,
action=none](0,0,3)
\psSolid[object=load,
load=ConeB1,
hollow,rm=0,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50]
\psSolid[object=plan,definition=equation,
args={[0 1 1 -1.3] 180},
base=-3 3 -3 3.5,
opacity=.5,
fillcolor=green!20]
\defFunction[algebraic]{parabole}(t)%
{t}{0.65-0.385*t^2} {0.65+0.385*t^2}
\psSolid[object=courbe,
r=0,
range=-2.45 2.45,
linecolor=blue,
linewidth=2\pslinewidth,
function=parabole]
\axesIIID(0,0,1.3)(5,5,7)
\end{pspicture}
\end{center}
\end{document}
Section hyperbolique :
\documentclass{article}
\usepackage{pst-solides3d}
\usepackage{pst-math}
\begin{document}
\begin{center}
\begin{pspicture}(-4,-5)(4,5)
\psset{lightsrc=viewpoint}
\psset{viewpoint=100 30 20 rtp2xyz,Decran=100}
\psSolid[object=grille,base=-4 4 -4 4,linecolor={[rgb]{0.72 0.72 0.5}}](0,0,-3)
\psset{solidmemory}
\psSolid[object=cone,h=3,r=3,
rm=0,
plansepare={[0 2 1 -1.30]},
name=ConeA,
ngrid=9 30,
action=none](0,0,-3)
\psSolid[object=load,
load=ConeA1,
rm=0,
hollow,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50]
\psSolid[object=cone,h=3,r=3,
rm=0,
plansepare={[0 2 1 -1.30]},
name=ConeB,
RotY=180,
ngrid=9 30,
action=none](0,0,3)
\psSolid[object=load,
load=ConeB1,
hollow,rm=0,
grid,
fillcolor={[rgb]{0.5 0.72 0.5}},incolor=yellow!50]
\psSolid[object=plan,definition=equation,
args={[0 2 1 -1.3] 180},
base=-3 3 -5 3.5,
opacity=.5,
fillcolor=green!20]
\defFunction[algebraic]{hyp1}(t)%
{0.745*SINH(t)}{0.865+0.43*COSH(t)} {-0.43-0.86*COSH(t)}
\psSolid[object=courbe,
r=0,
range=-1.75 1.75,
linecolor=blue,
linewidth=2\pslinewidth,
function=hyp1]
\defFunction[algebraic]{hyp2}(t)%
{0.745*SINH(t)}{0.865-0.43*COSH(t)} {-0.43+0.86*COSH(t)}
\psSolid[object=courbe,
r=0,
range=-2.05 2.05,
linecolor=blue,
linewidth=2\pslinewidth,
function=hyp2]
\axesIIID(0,0,1.3)(5,5,7)
\end{pspicture}
\end{center}
\end{document}
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