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+\section{Fusing solids}
+
+It is possible to arrange several solids within the same
+structure: this is done with the operation \verb+fusion+ of
+solids. This technique uses the painting algorithm for the whole
+scene.
+
+To do so, you must activate the option \verb+\psset{solidmemory}+
+to memorize the structures of the different solids within
+\bs{psSolid}, with each of them given a separate name.
+
+You use the object \verb+fusion+ of \bs{psSolid}, by indicating in
+the parameter \verb+base+ the list of names of the solids to be
+fused.
+
+To draw the scene, don't forget to conclude the code with
+\verb+\composeSolid+.
+
+\psset{lightsrc=50 -50 50,viewpoint=40 16 32 rtp2xyz,Decran=40}
+\begin{LTXexample}[width=7.5cm]
+\psset{unit=.6}
+\begin{pspicture}(-6,-5)(6,7)
+\psset{solidmemory}
+\psSolid[object=cylindre,h=6,fillcolor=blue,
+ r=1.5,
+ ngrid=4 16,
+ action=none,
+ name=A1,
+ ](0,0,-4)
+\psSolid[object=anneau,h=6,fillcolor=red!50,
+ R=4,r=3,h=1,
+ action=none,
+ name=B1,
+ ](0,0,-1)
+\psSolid[object=fusion,
+ action=draw**,
+ base=A1 B1,
+ ](0,0,0)
+\composeSolid
+\end{pspicture}
+\end{LTXexample}
+
+
+\begin{LTXexample}[width=6.5cm]
+\psset{unit=0.5}
+\begin{pspicture}(-6,-5)(6,5)
+\psset{solidmemory}
+\psset{lightsrc=50 -50 50,viewpoint=100 -30 40,
+ Decran=100,linewidth=0.5\pslinewidth,
+ ngrid=18 18,fillcolor=white,
+ h=12,r=2,RotX=90}
+\psframe*[linecolor=black](-6,-5)(6,5)
+\psSolid[object=cylindrecreux,
+ action=none,
+ name=cylindre1](0, 6, 0)
+\psSolid[object=cylindrecreux,
+ RotZ=90,
+ action=none,
+ name=cylindre2](-6, 0, 0)
+\psSolid[object=fusion,
+ base=cylindre1 cylindre2,RotX=0]
+\composeSolid
+\end{pspicture}
+\end{LTXexample}
+
+\endinput