+\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}
+
+\tracePointsMesh[tikz,mode=ext,bbox = show,
+color=red,print=points]{mesh.txt}
+\tracePointsMesh[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,
+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)}
+
+\meshAddPointBWinc[
+tikz,
+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)}
+{}{\draw[color=green] (0,0) -- (3,3);}
+
+\meshAddPointBW[
+tikz,
+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)}
+