Added Xy and Xyz swizzle operators.

Source/OpenTK/Math/Vector3.cs

@@ -1004,6 +1004,15 @@ namespace OpenTK.Math
 
         #endregion
 
+        #region Swizzle
+
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector2 with the X and Y components of this instance.
+        /// </summary>
+        public Vector2 Xy { get { return new Vector2(X, Y); } set { X = value.X; Y = value.Y; } }
+
+        #endregion
+
         #region Operators
 
         public static Vector3 operator +(Vector3 left, Vector3 right)

Source/OpenTK/Math/Vector3h.cs

@@ -189,6 +189,15 @@ namespace OpenTK.Math
 
         #endregion Constructors
 
+        #region Swizzle
+
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector2h with the X and Y components of this instance.
+        /// </summary>
+        public Vector2h Xy { get { return new Vector2h(X, Y); } set { X = value.X; Y = value.Y; } }
+
+        #endregion
+
         #region Half -> Single
 
         /// <summary>

Source/OpenTK/Math/Vector4.cs

@@ -827,8 +827,14 @@ namespace OpenTK.Math
 
         #region Swizzle
 
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector2 with the X and Y components of this instance.
+        /// </summary>
         public Vector2 Xy { get { return new Vector2(X, Y); } set { X = value.X; Y = value.Y; } }
 
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector3 with the X, Y and Z components of this instance.
+        /// </summary>
         public Vector3 Xyz { get { return new Vector3(X, Y, Z); } set { X = value.X; Y = value.Y; Z = value.Z; } }
 
         #endregion

Source/OpenTK/Math/Vector4d.cs

@@ -822,6 +822,20 @@ namespace OpenTK.Math
 
         #endregion
 
+        #region Swizzle
+
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector2d with the X and Y components of this instance.
+        /// </summary>
+        public Vector2d Xy { get { return new Vector2d(X, Y); } set { X = value.X; Y = value.Y; } }
+
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector3d with the X, Y and Z components of this instance.
+        /// </summary>
+        public Vector3d Xyz { get { return new Vector3d(X, Y, Z); } set { X = value.X; Y = value.Y; Z = value.Z; } }
+
+        #endregion
+
         #region Operators
 
         public static Vector4d operator +(Vector4d left, Vector4d right)

Source/OpenTK/Math/Vector4h.cs

@@ -206,6 +206,20 @@ namespace OpenTK.Math
 
         #endregion Constructors
 
+        #region Swizzle
+
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector2h with the X and Y components of this instance.
+        /// </summary>
+        public Vector2h Xy { get { return new Vector2h(X, Y); } set { X = value.X; Y = value.Y; } }
+
+        /// <summary>
+        /// Gets or sets an OpenTK.Math.Vector3h with the X, Y and Z components of this instance.
+        /// </summary>
+        public Vector3h Xyz { get { return new Vector3h(X, Y, Z); } set { X = value.X; Y = value.Y; Z = value.Z; } }
+
+        #endregion
+
         #region Half -> Single
 
         /// <summary>