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+\section{Positionner un point connu}
+
+\begin{verbatim}
+\psPoint(x,y,z){name}
+\end{verbatim}
+C'est une commande analogue à \verb+\pnode(! x y){name}+. Elle place
+dans le n\oe{}ud \texttt{(name)} le point de coordonnées $(x,y,z)$,
+vu avec le point de vue choisi \texttt{viewpoint=vx vy vz}. On peut
+donc ensuite s'en servir pour marquer des points, tracer des lignes,
+des polygones etc.
+
+Plaçons les positions des centres des atomes de la molécule d'éthanal
+$\mathrm{CH_3COH}$.
+
+\medbreak
+\begin{minipage}{0.5\linewidth}
+\begin{pspicture}(-4,-4)(4,5)
+\psset{viewpoint=100 50 20 rtp2xyz,Decran=20}
+\psframe(-4,-4)(4,5)
+\axesIIID(3,3,3)(20,20,20)
+\psPoint(-4.79,2.06,0){C1}
+\psPoint(-4.79,15.76,0){Ox}
+\psPoint(8.43,5.57,0){C2}
+\psPoint(-14.14,3.34,0){H3}
+\psPoint(14.14,-2.94,8.90){H6}
+\psPoint(14.14,-2.94,-8.90){H7}
+\psPoint(6.43,-16.29,0){H8}
+\psline(C1)(H3)
+\psline(C2)(H7)
+\psline(C2)(H8)
+\psline(C1)(C2)
+\psline[doubleline=true](C1)(Ox)
+\psline(C2)(H6)
+\uput[r](H3){$\mathrm{H_1}$}
+\uput[l](H6){$\mathrm{H_2}$}
+\uput[l](H7){$\mathrm{H_3}$}
+\uput[l](H8){$\mathrm{H_4}$}
+\uput{0.25}[u](C1){$\mathrm{C_1}$}
+\uput{0.25}[d](C2){$\mathrm{C_2}$}
+\uput{0.25}[r](Ox){$\red\mathrm{O}$}
+\psdots[dotstyle=o,dotsize=0.3](H3)(H6)(H7)(H8)
+\psdots[dotsize=0.4](C1)(C2)
+\psdot[linecolor=red,dotsize=0.4](Ox)
+\end{pspicture}
+\end{minipage}
+\begin{minipage}{0.45\linewidth}
+\begin{verbatim}
+\psPoint(-4.79,2.06,0){C1}
+\psPoint(-4.79,15.76,0){Ox}
+\psPoint(8.43,5.57,0){C2}
+\psPoint(-14.14,3.34,0){H3}
+\psPoint(14.14,-2.94,8.90){H6}
+\psPoint(14.14,-2.94,-8.90){H7}
+\psPoint(6.43,-16.29,0){H8}
+\psline(C1)(H3)
+\psline(C2)(H7)
+\psline(C2)(H8)
+\psline(C1)(C2)
+\psline[doubleline=true](C1)(Ox)
+\psline(C2)(H6)
+\uput[r](H3){$\mathrm{H_1}$}
+\uput[l](H6){$\mathrm{H_2}$}
+\uput[l](H7){$\mathrm{H_3}$}
+\uput[l](H8){$\mathrm{H_4}$}
+\uput{0.25}[u](C1){$\mathrm{C_1}$}
+\uput{0.25}[d](C2){$\mathrm{C_2}$}
+\uput{0.25}[r](Ox){$\red\mathrm{O}$}
+\psdots[dotstyle=o,dotsize=0.3]
+ (H3)(H6)(H7)(H8)
+\psdots[dotsize=0.4](C1)(C2)
+\psdot[linecolor=red,dotsize=0.4](Ox)
+\end{verbatim}
+\end{minipage}
+