\documentclass{article}
%% compiler avec lualatex
\usepackage[margin=2.5cm]{geometry}
\usepackage{luamesh}
\usepackage{fontspec}
\usepackage{multido}
\pagestyle{empty}

\def\drawPath{draw (-2,-2)*u--(8,-2)*u--(8,6)*u--(-2,6)*u--cycle  withcolor 0.99white;}
\def\clipPath{clip currentpicture to (-2,-2)*u--(8,-2)*u--(8,6)*u--(-2,6)*u--cycle;}

\begin{document}

\tracePointsMeshinc[
mode=ext,
bbox = show,
colorBbox = blue!20,
print=points
]
{mesh.txt}%
{%
  beginfig(0);
  \drawPath
}%
{%
  \clipPath
  endfig;
}

\newpage

\buildMeshBWinc[
mode=ext,
bbox = show,
colorBbox = blue!20,
print=points
]
{meshInit.txt}%
{%
  beginfig(0);
  \drawPath
}%
{%
  \clipPath
  endfig;
}

\multido{\ii=5+1}{4}{%
  \newpage
  \meshAddPointBWinc[
  mode=ext,step=badtriangles,
  colorNew =green!20!red,
  colorBack=red!10,
  colorCircle = blue,
  bbox = show,
  colorBbox = blue!20
  ]
  {mesh.txt}{\ii}%
  {%
    beginfig(0);
    \drawPath
  }%
  {%
    \clipPath
    endfig;
  }   \newpage
  \meshAddPointBWinc[
  mode=ext,step=cavity,
  colorNew =green!20!red,
  colorBack=red!10,
  colorCircle = blue,
  bbox = show,
  colorBbox = blue!20
  ]
  {mesh.txt}{\ii}%
  {%
    beginfig(0);
    \drawPath
  }%
  {%
    \clipPath
    endfig;
  }  \newpage
  \meshAddPointBWinc[
  mode=ext,step=newtriangles,
  colorNew =green!20!red,
  colorBack=red!10,
  colorCircle = blue,
  bbox = show,
  colorBbox = blue!20]
  {mesh.txt}{\ii}%
  {%
    beginfig(0);
    \drawPath
  }%
  {%
    \clipPath
    endfig;
  }
}
\newpage
\buildMeshBWinc[
mode=ext,
bbox = show,
colorBbox = blue!20,
print=points
]
{mesh.txt}%
{%
  beginfig(0);
  \drawPath
}%
{%
  \clipPath
  endfig;
}
\newpage
\buildMeshBWinc[
mode=ext,
print=points
]
{mesh.txt}%
{%
  beginfig(0);
  \drawPath
}%
{%
  \clipPath
  endfig;
}

\end{document}
