+% \meshAddPointBW[
+% color = green,
+% meshpoint = x,
+% colorBack=red!10,
+% colorNew = green!20!red,
+% scale=0.6cm,
+% step=cavity]
+% {(0,0);(3.5,3);(7,0);(7.5,5);(1.61,3.14);(6,4)}{(3,1)}
+% \meshAddPointBW[
+% meshpoint = x,
+% colorBack=red!10,
+% colorNew = green!20!red,
+% scale=0.6cm,
+% step=badtriangles,
+% newpoint = y,
+% bbox = show,
+% colorBbox = black
+% ]
+% {(0,0);(3.5,3);(7,0);(7.5,5);(1.61,3.14);(6,4)}{(3,1)}
+
+% \mplibcolor\myclr{red}
+
+% \newcommand\test{draw (0,0) -- (2cm,0) withcolor \myclr;}
+
+% \begin{mplibcode}
+% beginfig(0);
+% %\meshAddOnePoint[picture=embedded]{(0,0);(3.5,3);(7,0);(7.5,5);(1.61,3.14);(6,4)}{(3,1)}
+% \test
+% endfig;
+% \end{mplibcode}
+
+% \meshAddPointBWinc[
+% meshpoint = x,
+% colorBack=red!10,
+% colorNew = green!20!red,
+% scale=0.6cm,
+% step=badtriangles,
+% newpoint = y,
+% bbox = show,
+% colorBbox = blue!20,
+% ]
+% {(0,0);(3.5,3);(7,0);(7.5,5);(1.61,3.14);(6,4)}{(3,1)}{%
+% beginfig(0);
+% }%
+% {%
+% draw (-1,-1)*u--(8.5,-1)*u--(8.5,6)*u--(-1,6)*u--cycle withcolor \mpcolor{red};
+% endfig;
+% }
+
+
+% \section{tikz}
+
+% \buildMeshBW[tikz,print=points, meshpoint = I,
+% color=red]{(0,0);(3.5,3);(7,0);(7.5,5);(1.61,3.14);(3,1);(6,1.5)}
+
+% \buildMeshBW[tikz,mode=ext, color=red]{mesh.txt}
+
+% \drawPointsMesh[tikz,mode=ext,bbox = show,
+% color=red,print=points]{mesh.txt}
+% \drawPointsMesh[tikz,mode=ext,bbox = show, color=red]{mesh.txt}
+
+% \buildMeshBWinc[tikz,mode=ext,bbox = show, colorBbox = blue]{mesh.txt}{%
+% }%
+% {%
+% \draw[color = red] (0,0) -- (3,3);
+% }
+
+% \meshAddPointBW[
+% tikz,
+% color = green,