From f925ec15078d3e3008e0b3519a0b7ad5bf72513d Mon Sep 17 00:00:00 2001
From: the_fiddler <the_fiddler@ebc5dd9b-fb1d-0410-b6f8-d24c324e9604>
Date: Sun, 21 Nov 2010 00:09:50 +0000
Subject: [PATCH] Modified TransformPerspective to work correctly with
 orthographic projection matrices. Fixes issue [#1827]:
 "OpenTK.Vector3.TransformPerspective code is wrong".

---
 Source/OpenTK/Math/Vector3.cs  | 2 +-
 Source/OpenTK/Math/Vector3d.cs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/OpenTK/Math/Vector3.cs b/Source/OpenTK/Math/Vector3.cs
index f48d745b..5ce13d85 100644
--- a/Source/OpenTK/Math/Vector3.cs
+++ b/Source/OpenTK/Math/Vector3.cs
@@ -1154,7 +1154,7 @@ namespace OpenTK
         /// <param name="result">The transformed vector</param>
         public static void TransformPerspective(ref Vector3 vec, ref Matrix4 mat, out Vector3 result)
         {
-            Vector4 v = new Vector4(vec);
+            Vector4 v = new Vector4(vec, 1);
             Vector4.Transform(ref v, ref mat, out v);
             result.X = v.X / v.W;
             result.Y = v.Y / v.W;
diff --git a/Source/OpenTK/Math/Vector3d.cs b/Source/OpenTK/Math/Vector3d.cs
index cec1cbc8..f61c3ec8 100644
--- a/Source/OpenTK/Math/Vector3d.cs
+++ b/Source/OpenTK/Math/Vector3d.cs
@@ -1152,7 +1152,7 @@ namespace OpenTK
         /// <param name="result">The transformed vector</param>
         public static void TransformPerspective(ref Vector3d vec, ref Matrix4d mat, out Vector3d result)
         {
-            Vector4d v = new Vector4d(vec);
+            Vector4d v = new Vector4d(vec, 1);
             Vector4d.Transform(ref v, ref mat, out v);
             result.X = v.X / v.W;
             result.Y = v.Y / v.W;