doc-en/par-tronque-en.tex

   1 \section{Truncate a solid's vertices}
   2
   3 The option \Lkeyword{trunc} allows us to \Index{truncate} a solid's vertices either
   4 globally or individually. This option uses the key
   5 \Lkeyword{trunccoeff} (value $0.25$ by default) which indicates the ratio
   6 $k$ used for the \Index{truncation} ($0<k\leq 0.5$).
   7 %
   8 \begin{itemize}
   9   \item \texttt{\Lkeyword{trunc}=\Lkeyval{all}} truncates all the vertices;
  10   \item \texttt{\Lkeyword{trunc}=0 1 2 3} truncates the vertices 0, 1, 2 and 3.
  11 \end{itemize}
  12 %
  13 \begin{LTXexample}[width=6cm]
  14 \psset{viewpoint=50 50 30 rtp2xyz,Decran=25,lightsrc=viewpoint}
  15 \begin{pspicture}(-3,-2)(2,2)
  16 \psSolid[
  17    action=draw,
  18    object=cube,
  19    RotZ=30,
  20    trunccoeff=.2,
  21    trunc=all]%
  22 \end{pspicture}
  23 \end{LTXexample}
  24
  25 \begin{LTXexample}[width=6cm]
  26 \psset{viewpoint=50 50 30 rtp2xyz,Decran=25,lightsrc=viewpoint}
  27 \begin{pspicture}(-3,-2)(2,2)
  28 \psSolid[action=draw,
  29    object=cube,
  30    RotZ=30,
  31    trunccoeff=.2,
  32    trunc=0 1 2 3]%
  33 \end{pspicture}
  34 \end{LTXexample}
  35
  36 \endinput