From 61cb27806fb2b0f901c668bc3132dd6f0a82ea85 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Wed, 11 Feb 2004 10:19:52 +0000
Subject: [PATCH] From Brad Christiansen, fix to enable AutoTransform to keep
 track of window size/perspective changes

---
 include/osg/AutoTransform |  5 ++++-
 src/osg/AutoTransform.cpp | 11 +++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/include/osg/AutoTransform b/include/osg/AutoTransform
index 64960d3ae..6e15d9715 100644
--- a/include/osg/AutoTransform
+++ b/include/osg/AutoTransform
@@ -89,13 +89,16 @@ class SG_EXPORT AutoTransform : public Transform
         mutable bool        _firstTimeToInitEyePoint;
         mutable osg::Vec3   _previousEyePoint;
         mutable int         _previousWidth;
-        mutable int         _previousHeight;
+        mutable int         _previousHeight;        
+        mutable osg::Matrix _previousProjection;
 
         void computeMatrix() const;
 
         mutable bool        _matrixDirty;
         mutable osg::Matrix _cachedMatrix;
         
+       
+        
 };
 
 }
diff --git a/src/osg/AutoTransform.cpp b/src/osg/AutoTransform.cpp
index f5d6870a8..8bc5b313f 100644
--- a/src/osg/AutoTransform.cpp
+++ b/src/osg/AutoTransform.cpp
@@ -107,7 +107,9 @@ void AutoTransform::accept(NodeVisitor& nv)
                 height = viewport->height();
             }
 
-            osg::Vec3 eyePoint = cs->getEyeLocal();  
+            const osg::Vec3& eyePoint = cs->getEyeLocal();    
+
+            const osg::Matrix& projection = cs->getProjectionMatrix();
 
             bool doUpdate = _firstTimeToInitEyePoint;
             if (!_firstTimeToInitEyePoint)
@@ -120,7 +122,11 @@ void AutoTransform::accept(NodeVisitor& nv)
                 else if (width!=_previousWidth || height!=_previousHeight)
                 {
                     doUpdate = true;
-                } 
+                }
+                else if (projection != _previousProjection) 
+                {
+                    doUpdate = true;
+                }                
             }
             _firstTimeToInitEyePoint = false;
 
@@ -143,6 +149,7 @@ void AutoTransform::accept(NodeVisitor& nv)
                 _previousEyePoint = eyePoint;
                 _previousWidth = width;
                 _previousHeight = height;
+                _previousProjection = projection;
 
                 _matrixDirty = true;
             }