diff --git a/UVtools.Core/EmguCV/EmguContour.cs b/UVtools.Core/EmguCV/EmguContour.cs
index b4af097..1878a7a 100644
--- a/UVtools.Core/EmguCV/EmguContour.cs
+++ b/UVtools.Core/EmguCV/EmguContour.cs
@@ -22,7 +22,7 @@ namespace UVtools.Core.EmguCV;
 /// <summary>
 /// A contour cache for OpenCV
 /// </summary>
-public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<EmguContour>, IComparer<EmguContour>
+public class EmguContour : IReadOnlyList<Point>, IComparable<EmguContour>, IComparer<EmguContour>, IDisposable
 {
     #region Constants
 
@@ -35,7 +35,7 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
 
     #region Members
 
-    private VectorOfPoint _points;
+    private VectorOfPoint _contour;
     private Rectangle? _bounds;
     private RotatedRect? _boundsBestFit;
     private CircleF? _minEnclosingCircle;
@@ -56,13 +56,13 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
 
     public int YMax => Bounds.Bottom;
 
-    public Rectangle Bounds => _bounds ??= CvInvoke.BoundingRectangle(_points);
+    public Rectangle Bounds => _bounds ??= CvInvoke.BoundingRectangle(_contour);
 
-    public RotatedRect BoundsBestFit => _boundsBestFit ??= CvInvoke.MinAreaRect(_points);
+    public RotatedRect BoundsBestFit => _boundsBestFit ??= CvInvoke.MinAreaRect(_contour);
 
-    public CircleF MinEnclosingCircle => _minEnclosingCircle ??= CvInvoke.MinEnclosingCircle(_points);
+    public CircleF MinEnclosingCircle => _minEnclosingCircle ??= CvInvoke.MinEnclosingCircle(_contour);
 
-    public bool IsConvex => _isConvex ??= CvInvoke.IsContourConvex(_points);
+    public bool IsConvex => _isConvex ??= CvInvoke.IsContourConvex(_contour);
 
     /// <summary>
     /// Gets the area of the contour
@@ -73,7 +73,7 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
         {
             if (double.IsNaN(_area))
             {
-                _area = CvInvoke.ContourArea(_points);
+                _area = CvInvoke.ContourArea(_contour);
             }
                 
             return _area;
@@ -89,13 +89,13 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
         {
             if (double.IsNaN(_perimeter))
             {
-                _perimeter = CvInvoke.ArcLength(_points, true);
+                _perimeter = CvInvoke.ArcLength(_contour, true);
             }
             return _perimeter;
         }
     }
 
-    public Moments Moments => _moments ??= CvInvoke.Moments(_points);
+    public Moments Moments => _moments ??= CvInvoke.Moments(_contour);
 
     /// <summary>
     /// Gets the centroid of the contour
@@ -108,13 +108,13 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
     /// <summary>
     /// Gets or sets the contour points
     /// </summary>
-    public VectorOfPoint Points
+    public VectorOfPoint Contour
     {
-        get => _points;
+        get => _contour;
         set
         {
             Dispose();
-            _points = value ?? throw new ArgumentNullException(nameof(Points));
+            _contour = value ?? throw new ArgumentNullException(nameof(Contour));
         }
     }
 
@@ -122,16 +122,18 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
     /// <summary>
     /// Gets if this contour have any point
     /// </summary>
-    public bool IsEmpty => _points.Size == 0;
+    public bool IsEmpty => _contour.Size == 0;
     #endregion
 
     #region Constructor
-    public EmguContour(VectorOfPoint points) : this(points.ToArray())
-    { }
 
-    public EmguContour(Point[] points)
+    public EmguContour(VectorOfPoint points)
+    {
+        _contour = points;
+    }
+
+    public EmguContour(Point[] points) : this(new VectorOfPoint(points))
     {
-        Points = new VectorOfPoint(points);
     }
     #endregion
 
@@ -152,19 +154,19 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
     public bool IsInside(Point point)
     {
         if (!IsInsideBounds(point)) return false;
-        return CvInvoke.PointPolygonTest(_points, point, false) >= 0;
+        return CvInvoke.PointPolygonTest(_contour, point, false) >= 0;
     }
 
     public double MeasureDist(Point point)
     {
         if (!IsInsideBounds(point)) return -1;
-        return CvInvoke.PointPolygonTest(_points, point, true);
+        return CvInvoke.PointPolygonTest(_contour, point, true);
     }
 
     public IOutputArray ContourApproximation(double epsilon = 0.1)
     {
         var mat = new Mat();
-        CvInvoke.ApproxPolyDP(_points, mat, epsilon*Perimeter, true);
+        CvInvoke.ApproxPolyDP(_contour, mat, epsilon*Perimeter, true);
         return mat;
     }
 
@@ -237,14 +239,12 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
 
     public EmguContour Clone()
     {
-        var clone = (EmguContour)MemberwiseClone();
-        clone._points = new VectorOfPoint(_points.ToArray());
-        return clone;
+        return new EmguContour(Contour.ToArray());
     }
 
     public IEnumerator<Point> GetEnumerator()
     {
-        return (IEnumerator<Point>) _points.ToArray().GetEnumerator();
+        return (IEnumerator<Point>) _contour.ToArray().GetEnumerator();
     }
 
     IEnumerator IEnumerable.GetEnumerator()
@@ -252,16 +252,20 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
         return GetEnumerator();
     }
 
-    public int Count => _points.Size;
+    public int Count => _contour.Size;
 
-    public Point this[int index] => _points[index];
-    public Point this[uint index] => _points[(int) index];
-    public Point this[long index] => _points[(int) index];
-    public Point this[ulong index] => _points[(int) index];
+    public Point this[sbyte index] => _contour[index];
+    public Point this[byte index] => _contour[index];
+    public Point this[short index] => _contour[index];
+    public Point this[ushort index] => _contour[index];
+    public Point this[int index] => _contour[index];
+    public Point this[uint index] => _contour[(int) index];
+    public Point this[long index] => _contour[(int) index];
+    public Point this[ulong index] => _contour[(int) index];
 
     public void Dispose()
     {
-        _points.Dispose();
+        _contour.Dispose();
         _moments?.Dispose();
         _moments = null;
     }
@@ -272,7 +276,7 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
     protected bool Equals(EmguContour other)
     {
         if (Count != other.Count) return false;
-        return _points.ToArray().SequenceEqual(other.ToArray());
+        return _contour.ToArray().SequenceEqual(other.ToArray());
     }
 
     public override bool Equals(object? obj)
@@ -285,7 +289,7 @@ public class EmguContour : IReadOnlyCollection<Point>, IDisposable, IComparable<
 
     public override int GetHashCode()
     {
-        return _points.GetHashCode();
+        return _contour.GetHashCode();
     }
 
     public int CompareTo(EmguContour? other)
diff --git a/UVtools.Core/EmguCV/EmguContours.cs b/UVtools.Core/EmguCV/EmguContours.cs
index bc82109..0915351 100644
--- a/UVtools.Core/EmguCV/EmguContours.cs
+++ b/UVtools.Core/EmguCV/EmguContours.cs
@@ -25,49 +25,43 @@ namespace UVtools.Core.EmguCV;
 /// </summary>
 public class EmguContours : IReadOnlyList<EmguContour>, IDisposable
 {
+    #region Members
     private readonly EmguContour[] _contours;
 
-    public IEnumerator<EmguContour> GetEnumerator()
-    {
-        return ((IEnumerable<EmguContour>)_contours).GetEnumerator();
-    }
+    /// <summary>
+    /// Gets the contours inside <see cref="VectorOfVectorOfPoint"/>
+    /// </summary>
+    public readonly VectorOfVectorOfPoint VectorOfContours;
 
-    IEnumerator IEnumerable.GetEnumerator()
-    {
-        return _contours.GetEnumerator();
-    }
+    /// <summary>
+    /// Gets the contours hierarchy
+    /// </summary>
+    public readonly int[,] Hierarchy = new int[0, 0];
 
-    public int Count => _contours.Length;
+    #endregion
 
-    public readonly int[,] Hierarchy = new int[0,0];
+    #region Properties
+    /// <summary>
+    /// Gets if this collection have any contours
+    /// </summary>
+    public bool IsEmpty => Count == 0;
+    #endregion
 
-
-    public EmguContour this[int index] => _contours[index];
-
-    private EmguContours(int count, int[,] hierarchy)
-    {
-        _contours = new EmguContour[count];
-        Hierarchy = hierarchy;
-    }
-
-    public EmguContours(Point[][] points)
-    {
-        _contours = new EmguContour[points.Length];
-        for (int i = 0; i < points.Length; i++)
-        {
-            _contours[i] = new EmguContour(points[i]);
-        }
-    }
+    #region Constructor
 
     public EmguContours(VectorOfVectorOfPoint vectorOfPointsOfPoints)
     {
-        _contours = new EmguContour[vectorOfPointsOfPoints.Size];
-        for (int i = 0; i < _contours.Length; i++)
+        VectorOfContours = vectorOfPointsOfPoints;
+        _contours = new EmguContour[VectorOfContours.Size];
+        for (int i = 0; i < Count; i++)
         {
-            _contours[i] = new EmguContour(vectorOfPointsOfPoints[i]);
+            _contours[i] = new EmguContour(VectorOfContours[i]);
         }
     }
 
+    public EmguContours(Point[][] points) : this(new VectorOfVectorOfPoint(points))
+    { }
+
     public EmguContours(Point[][] points, int[,] hierarchy) : this(points)
     {
         Hierarchy = hierarchy;
@@ -80,13 +74,41 @@ public class EmguContours : IReadOnlyList<EmguContour>, IDisposable
 
     public EmguContours(IInputOutputArray mat, RetrType mode = RetrType.List, ChainApproxMethod method = ChainApproxMethod.ChainApproxSimple, Point offset = default)
     {
-        using var contours = mat.FindContours(out Hierarchy, mode, method, offset);
-        _contours = new EmguContour[contours.Size];
+        VectorOfContours = mat.FindContours(out Hierarchy, mode, method, offset);
+        _contours = new EmguContour[VectorOfContours.Size];
         for (int i = 0; i < _contours.Length; i++)
         {
-            _contours[i] = new EmguContour(contours[i]);
+            _contours[i] = new EmguContour(VectorOfContours[i]);
         }
     }
+    #endregion
+
+    #region Indexers
+
+    public EmguContour this[sbyte index] => _contours[index];
+    public EmguContour this[byte index] => _contours[index];
+    public EmguContour this[short index] => _contours[index];
+    public EmguContour this[ushort index] => _contours[index];
+    public EmguContour this[int index] => _contours[index];
+    public EmguContour this[uint index] => _contours[index];
+    public EmguContour this[ulong index] => _contours[index];
+    public EmguContour this[long index] => _contours[index];
+
+    #endregion
+
+    #region IReadOnlyList Implementation
+    public IEnumerator<EmguContour> GetEnumerator()
+    {
+        return ((IEnumerable<EmguContour>)_contours).GetEnumerator();
+    }
+
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+        return _contours.GetEnumerator();
+    }
+
+    public int Count => _contours.Length;
+    #endregion
 
     public (int Index, EmguContour Contour, double Distance)[][] CalculateCentroidDistances(bool includeOwn = false, bool sortByDistance = true)
     {
@@ -118,35 +140,19 @@ public class EmguContours : IReadOnlyList<EmguContour>, IDisposable
 
     public EmguContours Clone()
     {
-        var clone = new EmguContours(_contours.Length, Hierarchy);
-
-        for (int i = 0; i < _contours.Length; i++)
-        {
-            clone._contours[i] = this[i].Clone();
-        }
-
-        return clone;
+        return new EmguContours(VectorOfContours.ToArrayOfArray(), Hierarchy);
     }
 
     public void Dispose()
     {
+        VectorOfContours.Dispose();
         foreach (var contour in _contours)
         {
             contour.Dispose();
         }
     }
 
-
-
-
-
-
-
-
-
-
-
-
+    #region Static methods
     /// <summary>
     /// Gets contours inside a point
     /// </summary>
@@ -402,4 +408,6 @@ public class EmguContours : IReadOnlyList<EmguContour>, IDisposable
     {
         return ContoursIntersectingPixels(contour1, contour2) > 0;
     }
+
+    #endregion
 }
\ No newline at end of file
diff --git a/UVtools.Core/Layers/Layer.cs b/UVtools.Core/Layers/Layer.cs
index ae65ea8..7bbd958 100644
--- a/UVtools.Core/Layers/Layer.cs
+++ b/UVtools.Core/Layers/Layer.cs
@@ -1041,7 +1041,7 @@ public class Layer : BindableBase, IEquatable<Layer>, IEquatable<uint>
             if (_contours is null)
             {
                 using var mat = LayerMat;
-                _contours = new EmguContours(mat);
+                _contours = new EmguContours(mat, RetrType.Tree);
             }
 
             return _contours;
@@ -1053,7 +1053,7 @@ public class Layer : BindableBase, IEquatable<Layer>, IEquatable<uint>
     /// </summary>
     public EmguContours GetContours(IInputOutputArray mat)
     {
-        return _contours ??= new EmguContours(mat);
+        return _contours ??= new EmguContours(mat, RetrType.Tree);
     }
 
     #endregion
diff --git a/UVtools.Core/Operations/OperationRaftRelief.cs b/UVtools.Core/Operations/OperationRaftRelief.cs
index c6f0ea8..9503a26 100644
--- a/UVtools.Core/Operations/OperationRaftRelief.cs
+++ b/UVtools.Core/Operations/OperationRaftRelief.cs
@@ -336,7 +336,7 @@ public class OperationRaftRelief : Operation
                 break;
             case RaftReliefTypes.LinkedLines:
             {
-                using var contours = new EmguContours(supportsMatOriginal.FindContours());
+                using var contours = new EmguContours(supportsMatOriginal);
                 using var supportsRedraw = _linkedExternalSupports ? supportsMatOriginal.Clone() : null;
                 using var supportsBrightnessCorrection = _highBrightness < byte.MaxValue ? supportsMat.Clone() : null;
 
@@ -423,7 +423,7 @@ public class OperationRaftRelief : Operation
                     break;
                 case RaftReliefTypes.Tabs:
                 {
-                    using var contours = mat.FindContours(RetrType.External);
+                    using var contours = new EmguContours(mat, RetrType.External);
                     var span = mat.GetDataByteSpan();
 
                     var minX = 10;
@@ -443,10 +443,8 @@ public class OperationRaftRelief : Operation
                     };
 
                     var color = new MCvScalar(_highBrightness);
-
-                    for (var i = 0; i < contours.Size; i++)
+                    foreach(var contour in contours)
                     {
-                        using var contour = new EmguContour(contours[i]);
                         if(contour.Centroid.IsAnyNegative() || contour.Area < 10000) continue;
 
                         for (var dir = 0; dir < directions.Length; dir++)
@@ -473,7 +471,7 @@ public class OperationRaftRelief : Operation
                                         continue;
                                     }
 
-                                    if (CvInvoke.PointPolygonTest(contours[i], new PointF(x, y), false) == 0) // Must be on edge
+                                    if (CvInvoke.PointPolygonTest(contour.Contour, new PointF(x, y), false) == 0) // Must be on edge
                                     {
                                         foundPoint = true;
                                         break;
diff --git a/documentation/UVtools.Core.xml b/documentation/UVtools.Core.xml
index 3236aba..cb9550d 100644
--- a/documentation/UVtools.Core.xml
+++ b/documentation/UVtools.Core.xml
@@ -137,7 +137,7 @@
             Gets the centroid of the contour
             </summary>
         </member>
-        <member name="P:UVtools.Core.EmguCV.EmguContour.Points">
+        <member name="P:UVtools.Core.EmguCV.EmguContour.Contour">
             <summary>
             Gets or sets the contour points
             </summary>
@@ -167,6 +167,21 @@
             Use only with Tree type
             </summary>
         </member>
+        <member name="F:UVtools.Core.EmguCV.EmguContours.VectorOfContours">
+            <summary>
+            Gets the contours inside <see cref="T:Emgu.CV.Util.VectorOfVectorOfPoint"/>
+            </summary>
+        </member>
+        <member name="F:UVtools.Core.EmguCV.EmguContours.Hierarchy">
+            <summary>
+            Gets the contours hierarchy
+            </summary>
+        </member>
+        <member name="P:UVtools.Core.EmguCV.EmguContours.IsEmpty">
+            <summary>
+            Gets if this collection have any contours
+            </summary>
+        </member>
         <member name="M:UVtools.Core.EmguCV.EmguContours.GetContoursInside(Emgu.CV.Util.VectorOfVectorOfPoint,System.Int32[0:,0:],System.Drawing.Point,System.Boolean)">
             <summary>
             Gets contours inside a point