diff --git a/Triangle.NET/Triangle/Geometry/ITriangle.cs b/Triangle.NET/Triangle/Geometry/ITriangle.cs
index 93d78d0..7b22f16 100644
--- a/Triangle.NET/Triangle/Geometry/ITriangle.cs
+++ b/Triangle.NET/Triangle/Geometry/ITriangle.cs
@@ -16,7 +16,7 @@ namespace TriangleNet.Geometry
         /// <summary>
         /// The triangle id.
         /// </summary>
-        int ID { get; }
+        int ID { get; set; }
 
         /// <summary>
         /// First vertex id of the triangle.
diff --git a/Triangle.NET/Triangle/Geometry/Point.cs b/Triangle.NET/Triangle/Geometry/Point.cs
index 7f70192..72145a4 100644
--- a/Triangle.NET/Triangle/Geometry/Point.cs
+++ b/Triangle.NET/Triangle/Geometry/Point.cs
@@ -7,9 +7,6 @@
 namespace TriangleNet.Geometry
 {
     using System;
-    using System.Collections.Generic;
-    using System.Linq;
-    using System.Text;
 
     /// <summary>
     /// Represents a 2D point.
@@ -41,35 +38,39 @@ namespace TriangleNet.Geometry
         #region Public properties
 
         /// <summary>
-        /// Gets the vertex id.
+        /// Gets or sets the vertex id.
         /// </summary>
         public int ID
         {
             get { return this.id; }
+            set { this.id = value; }
         }
 
         /// <summary>
-        /// Gets the vertex x coordinate.
+        /// Gets or sets the vertex x coordinate.
         /// </summary>
         public double X
         {
             get { return this.x; }
+            set { this.x = value; }
         }
 
         /// <summary>
-        /// Gets the vertex y coordinate.
+        /// Gets or sets the vertex y coordinate.
         /// </summary>
         public double Y
         {
             get { return this.y; }
+            set { this.y = value; }
         }
 
         /// <summary>
-        /// Gets the vertex boundary mark.
+        /// Gets or sets the vertex boundary mark.
         /// </summary>
         public int Boundary
         {
             get { return this.mark; }
+            set { this.mark = value; }
         }
 
         #endregion
diff --git a/Triangle.NET/Triangle/IO/InputTriangle.cs b/Triangle.NET/Triangle/IO/InputTriangle.cs
index 32ca324..01e2a5a 100644
--- a/Triangle.NET/Triangle/IO/InputTriangle.cs
+++ b/Triangle.NET/Triangle/IO/InputTriangle.cs
@@ -31,6 +31,7 @@ namespace TriangleNet.IO
         public int ID
         {
             get { return 0; }
+            set { }
         }
 
         /// <summary>
diff --git a/Triangle.NET/Triangle/Mesh.cs b/Triangle.NET/Triangle/Mesh.cs
index 1749fe5..fd41cff 100644
--- a/Triangle.NET/Triangle/Mesh.cs
+++ b/Triangle.NET/Triangle/Mesh.cs
@@ -187,7 +187,7 @@ namespace TriangleNet
             behavior.MaxAngle = quality.MaximumAngle;
 
             behavior.MaxArea = quality.MaximumArea;
-            // TODO: behavior.VarArea = quality.VariableArea;
+            behavior.VarArea = quality.VariableArea;
 
             this.Refine();
         }
diff --git a/Triangle.NET/Triangle/Topology/DCEL/Face.cs b/Triangle.NET/Triangle/Topology/DCEL/Face.cs
index e3f6d47..14b4217 100644
--- a/Triangle.NET/Triangle/Topology/DCEL/Face.cs
+++ b/Triangle.NET/Triangle/Topology/DCEL/Face.cs
@@ -26,6 +26,7 @@ namespace TriangleNet.Topology.DCEL
         #endregion
 
         internal int id;
+        internal int mark;
 
         internal Point generator;
 
@@ -33,11 +34,12 @@ namespace TriangleNet.Topology.DCEL
         internal bool bounded;
 
         /// <summary>
-        /// Gets the face id.
+        /// Gets or sets the face id.
         /// </summary>
         public int ID
         {
             get { return id; }
+            set { id = value; }
         }
 
         /// <summary>
@@ -81,7 +83,7 @@ namespace TriangleNet.Topology.DCEL
 
         public override string ToString()
         {
-            return string.Format("F-ID {0}", generator.id);
+            return string.Format("F-ID {0}", generator == null ? id : generator.id);
         }
     }
 }
diff --git a/Triangle.NET/Triangle/Topology/DCEL/HalfEdge.cs b/Triangle.NET/Triangle/Topology/DCEL/HalfEdge.cs
index 3f72422..bff3dcc 100644
--- a/Triangle.NET/Triangle/Topology/DCEL/HalfEdge.cs
+++ b/Triangle.NET/Triangle/Topology/DCEL/HalfEdge.cs
@@ -9,6 +9,7 @@ namespace TriangleNet.Topology.DCEL
     public class HalfEdge
     {
         internal int id;
+        internal int mark;
 
         internal Vertex origin;
         internal Face face;
@@ -16,11 +17,18 @@ namespace TriangleNet.Topology.DCEL
         internal HalfEdge next;
 
         /// <summary>
-        /// Gets the half-edge id.
+        /// Gets or sets the half-edge id.
         /// </summary>
         public int ID
         {
             get { return id; }
+            set { id = value; }
+        }
+
+        public int Boundary
+        {
+            get { return mark; }
+            set { mark = value; }
         }
 
         /// <summary>
diff --git a/Triangle.NET/Triangle/Topology/DCEL/Vertex.cs b/Triangle.NET/Triangle/Topology/DCEL/Vertex.cs
index 966d916..2929e09 100644
--- a/Triangle.NET/Triangle/Topology/DCEL/Vertex.cs
+++ b/Triangle.NET/Triangle/Topology/DCEL/Vertex.cs
@@ -6,6 +6,8 @@
 
 namespace TriangleNet.Topology.DCEL
 {
+    using System.Collections.Generic;
+
     public class Vertex : TriangleNet.Geometry.Point
     {
         internal HalfEdge leaving;
@@ -40,5 +42,27 @@ namespace TriangleNet.Topology.DCEL
         {
             this.leaving = leaving;
         }
+
+        /// <summary>
+        /// Enumerates all half-edges leaving this vertex.
+        /// </summary>
+        /// <returns></returns>
+        public IEnumerable<HalfEdge> EnumerateEdges()
+        {
+            var edge = this.Leaving;
+            int first = edge.ID;
+
+            do
+            {
+                yield return edge;
+
+                edge = edge.Twin.Next;
+            } while (edge.ID != first);
+        }
+
+        public override string ToString()
+        {
+            return string.Format("V-ID {0}", base.id);
+        }
     }
 }
diff --git a/Triangle.NET/Triangle/Topology/Triangle.cs b/Triangle.NET/Triangle/Topology/Triangle.cs
index 9e42182..30379a4 100644
--- a/Triangle.NET/Triangle/Topology/Triangle.cs
+++ b/Triangle.NET/Triangle/Topology/Triangle.cs
@@ -106,11 +106,12 @@ namespace TriangleNet.Topology
         #region Public properties
 
         /// <summary>
-        /// Gets the triangle id.
+        /// Gets or sets the triangle id.
         /// </summary>
         public int ID
         {
             get { return this.id; }
+            set { this.id = value; }
         }
 
         /// <summary>