\section{Construction from scratch} The object \verb+new+ constructs a solid. Two parameters are used: \verb+sommets+ which indicates the list of coordinates of the different vertices, and \verb+faces+ which gives the list of faces of the solid; a face is characterized by a list of the indices of its vertices, listed in counterclockwise order when the face is viewed from the exterior of the solid. \subsection{Example 1: A house} \begin{LTXexample}[width=6.5cm] \psset{unit=0.5} \psset{lightsrc=10 -20 50,viewpoint=50 -20 30 rtp2xyz,Decran=50} \begin{pspicture*}(-7,-4)(7,7) \psSolid[object=new, sommets= 2 4 3 -2 4 3 -2 -4 3 2 -4 3 2 4 0 -2 4 0 -2 -4 0 2 -4 0 0 4 5 0 -4 5, faces={ [0 1 2 3] [7 6 5 4] [0 3 7 4] [3 9 2] [1 8 0] [8 9 3 0] [9 8 1 2] [6 7 3 2] [2 1 5 6]}, num=all, show=all, action=draw ]% \end{pspicture*} \end{LTXexample} Note that the solid \verb+new+ uses the same options as the other solids. For example, we give the same solid as above below, using the parameters \verb+hollow+, \verb+incolor+, \verb+fillcolor+, and \verb+rm+. %% example 2 \begin{LTXexample}[width=6.5cm] \psset{unit=0.5} \psset{lightsrc=10 -20 50,viewpoint=50 -20 30 rtp2xyz,Decran=50} \begin{pspicture*}(-7,-3.5)(7,7.5) \psSolid[object=new,fillcolor=red!50,incolor=yellow, action=draw**, hollow, rm=2, sommets= 2 4 3 -2 4 3 -2 -4 3 2 -4 3 2 4 0 -2 4 0 -2 -4 0 2 -4 0 0 4 5 0 -4 5, faces={ [0 1 2 3] [7 6 5 4] [0 3 7 4] [3 9 2] [1 8 0] [8 9 3 0] [9 8 1 2] [6 7 3 2] [2 1 5 6]}, num=all, show=all ]% \end{pspicture*} \end{LTXexample} \subsection{Exemple 2: Hyperboloid with a fixed radius} %\psset{lightsrc=10 20 30,SphericalCoor=true,viewpoint=50 20 30} %\psset{SphericalCoor=true,viewpoint=50 20 30} As always, the options of the macro \bs{psSolid} can start from Postscript code; see \textit{code jps}. [I don't quite know what this is supposed to mean] Unlike an example in pure Postscript, where we use the parameters $a$, $b$ et $h$ which are transmitted by the options of PSTriks. In this way one obtains a variable solid constructed from scratch. Remark: the code being used comes from a jps source used practically, as in: \noindent\url{http://melusine.eu.org/lab/bjps/solide/tour.jps} \begin{LTXexample}[width=6.5cm] \psset{unit=0.75} \psset{lightsrc=10 -20 50,viewpoint=50 -20 30 rtp2xyz,Decran=50} \begin{pspicture*}(-5,-5)(3,5) \psSolid[object=new,fillcolor=red!50,incolor=yellow, hollow, a=10, %% nb d'etages b=20, %% diviseur de 360, nb de meridiens h=8, %% hauteur action=draw**, sommets= /z0 h neg 2 div def a -1 0 { /k exch def 0 1 b 1 sub { /i exch def /r z0 h a div k mul add dup mul 4 div 1 add sqrt def 360 b idiv i mul cos r mul 360 b idiv i mul sin r mul z0 h a div k mul add } for } for, faces={ 0 1 a 1 sub { /k exch def k b mul 1 add 1 k 1 add b mul 1 sub { /i exch def [i i 1 sub b i add 1 sub b i add] } for [k b mul k 1 add b mul 1 sub k 2 add b mul 1 sub k 1 add b mul] } for }, ] \end{pspicture*} \end{LTXexample} \subsection{Example 3: Importing external files} From a file describing a solid in a particular format (other than \texttt{.obj} or \texttt{.off}), we can create a \texttt{.dat} file containing the coordinates of the vertices, and another \texttt{.dat} file containing the tables of indices of the vertices on each face. These files can then be entered as parameters \verb+sommets+ and \verb+faces+ when using the Postscript instruction \verb+run+. In the example below, the files \verb+sommets_nefer.dat+ and \verb+faces_nefer.dat+ have been placed in the directory of the compiler. \begin{LTXexample}[width=5.5cm] \psset{unit=0.4} \definecolor{AntiqueWhite}{rgb}{0.98,0.92,0.84} \begin{pspicture}(-7,-7)(7,8) \psset{lightsrc=30 -40 10} \psset{viewpoint=50 -50 20 rtp2xyz,Decran=50} \psset{RotX=90,sommets= (sommets_nefer.dat) run} \psSolid[object=new,fillcolor=AntiqueWhite,linewidth=0.5\pslinewidth, faces={(faces_nefer.dat) run}]% \psSolid[object=new,fillcolor=red,linewidth=0.5\pslinewidth, faces={(faces_nefer_levres.dat) run}]% \psSolid[object=new,fillcolor=black, faces={(faces_nefer_sourcils.dat) run}]% \end{pspicture} \hfill \begin{pspicture}(-7,-7)(7,8) \psset{lightsrc=-10 -40 -5,lightintensity=.5} \psset{viewpoint=50 -80 10 rtp2xyz,Decran=50} \psset{RotX=90,RotZ=30,sommets= (sommets_nefer.dat) run} \psSolid[object=new,fillcolor=AntiqueWhite,linewidth=0.5\pslinewidth, grid, faces={(faces_nefer.dat) run}]% \psSolid[object=new,fillcolor=red,linewidth=0.5\pslinewidth,grid, faces={(faces_nefer_levres.dat) run}]% \psSolid[object=new,fillcolor=black, faces={(faces_nefer_sourcils.dat) run}]% \end{pspicture} \end{LTXexample}