Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/PersistableGeometry.cs
===================================================================
diff -u
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/PersistableGeometry.cs	(revision 0)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/PersistableGeometry.cs	(revision 4871)
@@ -0,0 +1,66 @@
+// Copyright (C) Stichting Deltares 2024. All rights reserved.
+// 
+// This file is part of the Dam Engine.
+// 
+// The Dam Engine is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+// 
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+// 
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Collections.Generic;
+
+namespace Deltares.DamEngine.TestHelpers.Geometry;
+
+/// <summary>
+/// Persistable Geometry object (for json serialization)
+/// </summary>
+public class PersistableGeometry
+{
+    public List<PersistableSurface> Surfaces { get; set; }
+}
+
+/// <summary>
+/// Persistable Surface object (for json serialization)
+/// </summary>
+public class PersistableSurface
+{
+    public PersistableOuterLoop OuterLoop { get; set; }
+}
+
+/// <summary>
+/// Persistable Outerloop object (for json serialization)
+/// </summary>
+public class PersistableOuterLoop
+{
+    public List<PersistableCurve> Curves { get; set; }
+}
+
+/// <summary>
+/// Persistable Curve object (for json serialization)
+/// </summary>
+public class PersistableCurve
+{
+    public PersistablePoint HeadPoint { get; set; }
+    public PersistablePoint EndPoint { get; set; }
+}
+
+/// <summary>
+/// Persistable Point object (for json serialization)
+/// </summary>
+public class PersistablePoint
+{
+    public double X { get; set; }
+    public double Z { get; set; }
+}
\ No newline at end of file
Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/GeometryExporter.cs
===================================================================
diff -u
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/GeometryExporter.cs	(revision 0)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/GeometryExporter.cs	(revision 4871)
@@ -0,0 +1,107 @@
+// Copyright (C) Stichting Deltares 2024. All rights reserved.
+// 
+// This file is part of the Dam Engine.
+// 
+// The Dam Engine is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+// 
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+// 
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.IO;
+using System.Text.Json;
+using Deltares.DamEngine.Data.Geometry;
+
+namespace Deltares.DamEngine.TestHelpers.Geometry;
+
+/// <summary>
+/// Export the geometry to a file
+/// </summary>
+public static class GeometryExporter
+{
+    /// <summary>
+    /// Export the geometry to a json file
+    /// </summary>
+    /// <param name="geometry"></param>
+    /// <param name="fileName"></param>
+    public static void ExportToJsonFile(GeometryData geometry, string fileName)
+    {
+        var jsonSerializerOptions = new JsonSerializerOptions
+        {
+            WriteIndented = true
+        };
+        PersistableGeometry persistableGeometry = GeometryExporterHelper.CreateFromGeometryData(geometry);
+        string output = JsonSerializer.Serialize(persistableGeometry, jsonSerializerOptions);
+        // Save output to text file
+        File.WriteAllText(fileName, output);
+    }
+
+    /// <summary>
+    /// Export the geometry to a text file
+    /// </summary>
+    /// <param name="geometry"></param>
+    /// <param name="fileName"></param>
+    public static void ExportToFile(GeometryData geometry, string fileName)
+    {
+        using (var writer = new StreamWriter(fileName))
+        {
+            // Export points
+            writer.WriteLine("[BEGIN POINTS]");
+            foreach (Point2D point in geometry.Points)
+            {
+                writer.WriteLine($"{point.X}, {point.Z}");
+            }
+
+            writer.WriteLine("[END POINTS]");
+
+            // Export curves
+            writer.WriteLine("[BEGIN CURVES]");
+            foreach (GeometryCurve curve in geometry.Curves)
+            {
+                writer.WriteLine($"Curve: ({curve.HeadPoint.X}, {curve.HeadPoint.Z}) - ({curve.EndPoint.X}, {curve.EndPoint.Z})");
+            }
+
+            writer.WriteLine("[END CURVES]");
+
+            // Export surfaces
+            writer.WriteLine("[BEGIN SURFACES]");
+            foreach (GeometrySurface surface in geometry.Surfaces)
+            {
+                // Outerloop
+                writer.WriteLine($"Surface: {surface.Name}");
+                writer.WriteLine($"OuterLoop: {surface.OuterLoop.Name}");
+                foreach (GeometryCurve curve in surface.OuterLoop.CurveList)
+                {
+                    writer.WriteLine($"({curve.HeadPoint.X}, {curve.HeadPoint.Z}) - ({curve.EndPoint.X}, {curve.EndPoint.Z})");
+                }
+
+                writer.WriteLine("");
+
+                // Innerloops
+                foreach (GeometryLoop innerLoop in surface.InnerLoops)
+                {
+                    writer.WriteLine($"InnerLoop: {innerLoop.Name}");
+                    foreach (GeometryCurve curve in innerLoop.CurveList)
+                    {
+                        writer.WriteLine($"Curve: ({curve.HeadPoint.X}, {curve.HeadPoint.Z}) - ({curve.EndPoint.X}, {curve.EndPoint.Z})");
+                    }
+
+                    writer.WriteLine("");
+                }
+            }
+
+            writer.WriteLine("[END SURFACES]");
+        }
+    }
+}
\ No newline at end of file
Index: DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/GeometryExporterHelper.cs
===================================================================
diff -u
--- DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/GeometryExporterHelper.cs	(revision 0)
+++ DamEngine/trunk/src/Deltares.DamEngine.TestHelpers/Geometry/GeometryExporterHelper.cs	(revision 4871)
@@ -0,0 +1,68 @@
+// Copyright (C) Stichting Deltares 2024. All rights reserved.
+// 
+// This file is part of the Dam Engine.
+// 
+// The Dam Engine is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Affero General Public License for more details.
+// 
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+// 
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Linq;
+using Deltares.DamEngine.Data.Geometry;
+
+namespace Deltares.DamEngine.TestHelpers.Geometry;
+
+/// <summary>
+/// Helper class for exporting geometry
+/// </summary>
+public static class GeometryExporterHelper
+{
+    /// <summary>
+    /// Create a persistable geometry object from a GeometryData object
+    /// </summary>
+    /// <param name="geometry"></param>
+    /// <returns></returns>
+    public static PersistableGeometry CreateFromGeometryData(GeometryData geometry)
+    {
+        var persistableGeometry = new PersistableGeometry
+        {
+            Surfaces = []
+        };
+        foreach (GeometrySurface surface in geometry.Surfaces)
+        {
+            persistableGeometry.Surfaces.Add(new PersistableSurface
+            {
+                OuterLoop = new PersistableOuterLoop
+                {
+                    Curves = surface.OuterLoop.CurveList.Select(curve => new PersistableCurve
+                    {
+                        HeadPoint = new PersistablePoint
+                        {
+                            X = curve.HeadPoint.X,
+                            Z = curve.HeadPoint.Z
+                        },
+                        EndPoint = new PersistablePoint
+                        {
+                            X = curve.EndPoint.X,
+                            Z = curve.EndPoint.Z
+                        }
+                    }).ToList()
+                }
+            });
+        }
+
+        return persistableGeometry;
+    }
+}
\ No newline at end of file