diff --git a/Doc/images/mesh.collapse.png b/Doc/images/mesh.collapse.png
new file mode 100644
index 00000000..394c48e8
Binary files /dev/null and b/Doc/images/mesh.collapse.png differ
diff --git a/Doc/images/mesh.flip.png b/Doc/images/mesh.flip.png
new file mode 100644
index 00000000..70919d34
Binary files /dev/null and b/Doc/images/mesh.flip.png differ
diff --git a/Doc/images/src/mesh.collapse.tex b/Doc/images/src/mesh.collapse.tex
new file mode 100644
index 00000000..12fc437c
--- /dev/null
+++ b/Doc/images/src/mesh.collapse.tex
@@ -0,0 +1,175 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+\usepackage{color}
+
+\definecolor{ACG}{RGB}{55,91,64}
+
+\begin{document}
+
+\begin{center}
+
+%\colorbox{ACG}{
+
+\begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=white,minimum size=2pt},
+	edge/.style={draw,white,thick},
+	hedge/.style={->,>=latex,shorten >=5pt,draw,white,very thick},
+	redge/.style={line width=3pt,color=red!50!white}
+ ]
+
+\begin{scope}[yshift=-3.6cm]
+
+\begin{scope}[xshift=-4cm,x={(1.4,0)},y={(0,1.4)}]
+
+\coordinate (V1) at (-1,1);
+\coordinate (V2) at (-1,3);
+\coordinate (V3) at (0,0);
+\coordinate (V4) at (0,2);
+\coordinate (V5) at (0,4);
+\coordinate (V6) at (1,3);
+\coordinate (V7) at (1,1);
+
+\draw[edge] (V1) -- (V2) {};
+\draw[edge] (V2) -- (V4) {};
+
+
+\draw[hedge] ([xshift=-2pt]V4) -- ([xshift=-2pt]V3) {};
+\draw[hedge,color=red!50!white] ([xshift=2pt]V3) -- ([xshift=2pt]V4) {};
+
+\draw[edge] (V3) -- (V1) {};
+
+\draw[edge] (V4) -- (V6) {};
+\draw[edge] (V6) -- (V7) {};
+\draw[edge] (V7) -- (V3) {};
+
+\draw[edge] (V2) -- (V5) {};
+\draw[edge] (V5) -- (V6) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+\node[vertex] at (V5) {};
+\node[vertex] at (V6) {};
+\node[vertex] at (V7) {};
+
+\end{scope}
+
+\draw[->,>=latex,thick,white] (-1.5, 4) arc (105:75:6);
+\node[above] at (0, 4.2) {\textcolor{white}{\textbf{Collapse edge}}};
+
+\begin{scope}[xshift=4cm,x={(1.4,0)},y={(0,1.4)}]
+
+\coordinate (V1) at (-1,1);
+\coordinate (V2) at (-1,3);
+%\coordinate (V3) at (0,0);
+\coordinate (V4) at (0,2);
+\coordinate (V5) at (0,4);
+\coordinate (V6) at (1,3);
+\coordinate (V7) at (1,1);
+
+\draw[edge] (V1) -- (V2) {};
+\draw[edge] (V2) -- (V4) {};
+\draw[edge] (V4) -- (V1) {};
+
+\draw[edge] (V4) -- (V6) {};
+\draw[edge] (V6) -- (V7) {};
+\draw[edge] (V7) -- (V4) {};
+
+\draw[edge] (V2) -- (V5) {};
+\draw[edge] (V5) -- (V6) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V4) {};
+\node[vertex] at (V5) {};
+\node[vertex] at (V6) {};
+\node[vertex] at (V7) {};
+
+\end{scope}
+
+\end{scope}
+
+\begin{scope}[yshift=3.6cm]
+
+\begin{scope}[xshift=-4cm,x={(1.4,0)},y={(0,1.4)}]
+
+\coordinate (V1) at (-1,1);
+\coordinate (V2) at (-1,3);
+\coordinate (V3) at (0,0);
+\coordinate (V4) at (0,2);
+\coordinate (V5) at (0,4);
+\coordinate (V6) at (1,3);
+\coordinate (V7) at (1,1);
+
+\draw[edge] (V1) -- (V2) {};
+\draw[edge] (V2) -- (V4) {};
+
+
+\draw[hedge,color=red!50!white] ([xshift=-2pt]V4) -- ([xshift=-2pt]V3) {};
+\draw[hedge] ([xshift=2pt]V3) -- ([xshift=2pt]V4) {};
+
+\draw[edge] (V3) -- (V1) {};
+
+\draw[edge] (V4) -- (V6) {};
+\draw[edge] (V6) -- (V7) {};
+\draw[edge] (V7) -- (V3) {};
+
+\draw[edge] (V2) -- (V5) {};
+\draw[edge] (V5) -- (V6) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+\node[vertex] at (V5) {};
+\node[vertex] at (V6) {};
+\node[vertex] at (V7) {};
+
+\end{scope}
+
+\draw[->,>=latex,thick,white] (-1.5, 4) arc (105:75:6);
+\node[above] at (0, 4.2) {\textcolor{white}{\textbf{Collapse edge}}};
+
+\begin{scope}[xshift=4cm,x={(1.4,0)},y={(0,1.4)}]
+
+\coordinate (V1) at (-1,1);
+\coordinate (V2) at (-1,3);
+\coordinate (V3) at (0,0);
+%\coordinate (V4) at (0,2);
+\coordinate (V5) at (0,4);
+\coordinate (V6) at (1,3);
+\coordinate (V7) at (1,1);
+
+\draw[edge] (V1) -- (V2) {};
+\draw[edge] (V2) -- (V3) {};
+\draw[edge] (V3) -- (V1) {};
+
+\draw[edge] (V3) -- (V6) {};
+\draw[edge] (V6) -- (V7) {};
+\draw[edge] (V7) -- (V3) {};
+
+\draw[edge] (V2) -- (V5) {};
+\draw[edge] (V5) -- (V6) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V5) {};
+\node[vertex] at (V6) {};
+\node[vertex] at (V7) {};
+
+\end{scope}
+
+\end{scope}
+\end{tikzpicture}
+
+%}
+
+\end{center}
+
+\end{document}
diff --git a/Doc/images/src/mesh.flip.tex b/Doc/images/src/mesh.flip.tex
new file mode 100644
index 00000000..8bf5e9c1
--- /dev/null
+++ b/Doc/images/src/mesh.flip.tex
@@ -0,0 +1,79 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+\usepackage{color}
+
+\definecolor{ACG}{RGB}{55,91,64}
+
+\begin{document}
+
+\begin{center}
+
+%\colorbox{ACG}{
+
+\begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=white,minimum size=2pt},
+	edge/.style={draw,white,thick},
+	redge/.style={line width=3pt,color=red!50!white}
+ ]
+
+\begin{scope}[xshift=-5cm]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\draw[edge] (V1) to (V2) {};
+
+\draw[edge] (V1) -- (V3) {};
+
+\draw[redge] (V1) -- (V4) {};
+
+\draw[edge] (V2) -- (V4) {};
+
+\draw[edge] (V3) -- (V4) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+\end{scope}
+
+\draw[->,>=latex,thick,white] (-1.5, 4) arc (105:75:6);
+\node[above] at (0, 4.2) {\textcolor{white}{\textbf{Flip edge}}};
+
+\begin{scope}[xshift=5cm]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\draw[edge] (V1) to (V2) {};
+
+\draw[edge] (V1) -- (V3) {};
+
+\draw[redge] (V2) -- (V3) {};
+
+\draw[edge] (V2) -- (V4) {};
+
+\draw[edge] (V3) -- (V4) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+\end{scope}
+\end{tikzpicture}
+
+%}
+
+\end{center}
+
+\end{document}
diff --git a/Doc/images/src/mesh.io.tex b/Doc/images/src/mesh.io.tex
new file mode 100644
index 00000000..7494fb43
--- /dev/null
+++ b/Doc/images/src/mesh.io.tex
@@ -0,0 +1,50 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+
+\begin{document}
+
+\begin{center}
+ \begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=white,minimum size=2pt},
+ 	vertex/.style={draw=none,circle,fill=white,minimum size=2pt},
+	oedge/.style={->,>=latex,shorten >=6pt,draw,white,thick},
+	roedge/.style={->,>=latex,shorten >=6pt,draw,thick,color=red!60!white},
+	boedge/.style={->,>=latex,shorten >=6pt,draw,thick,color=blue!60!white}
+ ]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\path[boedge] ([yshift=3pt]V1) to ([yshift=3pt]V2) {};
+\path[roedge] ([yshift=-3pt]V2) to ([yshift=-3pt]V1) {};
+
+\path[oedge] ([yshift=3pt]V1) -- ([yshift=3pt]V3) {};
+\path[oedge] ([yshift=-3pt]V3) -- ([yshift=-3pt]V1) {};
+
+\path[boedge] ([xshift=2pt]V3) -- ([xshift=2pt]V2) {};
+\path[roedge] ([xshift=-2pt]V2) -- ([xshift=-2pt]V3) {};
+
+\path[roedge] ([yshift=3pt]V2) -- ([yshift=3pt]V4) {};
+\path[boedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V2) {};
+
+\path[oedge] ([yshift=3pt]V3) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V3) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+%\draw[->, thick] (-0.4,3) arc (0:320:20pt);
+
+
+\end{tikzpicture}
+\end{center}
+
+\end{document}
diff --git a/Doc/images/src/mesh.opp.tex b/Doc/images/src/mesh.opp.tex
new file mode 100644
index 00000000..27e1e080
--- /dev/null
+++ b/Doc/images/src/mesh.opp.tex
@@ -0,0 +1,50 @@
+\documentclass{minimal}
+
+% Tikz
+\usepackage{pgf}
+\usepackage{tikz}
+
+\begin{document}
+
+\begin{center}
+ \begin{tikzpicture}
+ [
+ 	vertex/.style={draw=none,circle,fill=white,minimum size=2pt},
+ 	vertex/.style={draw=none,circle,fill=white,minimum size=2pt},
+	oedge/.style={->,>=latex,shorten >=6pt,draw,white,thick},
+	roedge/.style={->,>=latex,shorten >=6pt,draw,thick,color=red!60!white},
+	boedge/.style={->,>=latex,shorten >=6pt,draw,thick,color=blue!60!white}
+ ]
+
+\coordinate (V1) at (-3,3);
+\coordinate (V2) at (0,0);
+\coordinate (V3) at (0,6);
+\coordinate (V4) at (3,3);
+
+\path[oedge] ([yshift=3pt]V1) to ([yshift=3pt]V2) {};
+\path[oedge] ([yshift=-3pt]V2) to ([yshift=-3pt]V1) {};
+
+\path[boedge] ([yshift=3pt]V1) -- ([yshift=3pt]V3) {};
+\path[roedge] ([yshift=-3pt]V3) -- ([yshift=-3pt]V1) {};
+
+\path[oedge] ([xshift=2pt]V3) -- ([xshift=2pt]V2) {};
+\path[oedge] ([xshift=-2pt]V2) -- ([xshift=-2pt]V3) {};
+
+\path[oedge] ([yshift=3pt]V2) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V2) {};
+
+\path[oedge] ([yshift=3pt]V3) -- ([yshift=3pt]V4) {};
+\path[oedge] ([yshift=-3pt]V4) -- ([yshift=-3pt]V3) {};
+
+\node[vertex] at (V1) {};
+\node[vertex] at (V2) {};
+\node[vertex] at (V3) {};
+\node[vertex] at (V4) {};
+
+%\draw[->, thick] (-0.4,3) arc (0:320:20pt);
+
+
+\end{tikzpicture}
+\end{center}
+
+\end{document}