From b5c57c3d68eeea77d6efb7146e2d57afe1ecfe43 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 29 Oct 2010 15:18:34 +0000
Subject: [PATCH] From Mikhail Izmestev, "I have discovered problem with
 draggers from osgManipulator in HUD.

This problem caused because osgManipulator::Dragger uses matrices of top camera instead last
absolute Camera in NodePath.

I attached modified osgManipulator/Dragger.cpp file, where added code for finding last absolute
camera. With this changes draggers works in HUD.

Example for demonstrate this problem you can find in osg-users list [1].

Mikhail.

[1] http://thread.gmane.org/gmane.comp.graphics.openscenegraph.user/62636
"
---
 src/osgManipulator/Dragger.cpp | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/osgManipulator/Dragger.cpp b/src/osgManipulator/Dragger.cpp
index 5234d6e40..a5b8d49ec 100644
--- a/src/osgManipulator/Dragger.cpp
+++ b/src/osgManipulator/Dragger.cpp
@@ -309,9 +309,6 @@ bool Dragger::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&
 
                 if (view->computeIntersections(ea.getX(),ea.getY(),intersections))
                 {
-                    _pointer.setCamera(view->getCamera());
-                    _pointer.setMousePosition(ea.getX(), ea.getY());
-
                     for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin();
                         hitr != intersections.end();
                         ++hitr)
@@ -327,6 +324,24 @@ bool Dragger::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&
                         {
                             if (dragger==this)
                             {
+                                osg::Camera *rootCamera = view->getCamera();
+                                osg::NodePath nodePath = _pointer._hitList.front().first;
+                                osg::NodePath::reverse_iterator ritr;
+                                for(ritr = nodePath.rbegin();
+                                    ritr != nodePath.rend();
+                                    ++ritr)
+                                {
+                                    osg::Camera* camera = dynamic_cast<osg::Camera*>(*ritr);
+                                    if (camera && (camera->getReferenceFrame()!=osg::Transform::RELATIVE_RF || camera->getParents().empty()))
+                                    {
+                                         rootCamera = camera;
+                                         break;
+                                    }
+                                }
+
+                                _pointer.setCamera(rootCamera);
+                                _pointer.setMousePosition(ea.getX(), ea.getY());
+
                                 dragger->handle(_pointer, ea, aa);
                                 dragger->setDraggerActive(true);
                                 handled = true;
@@ -341,7 +356,7 @@ bool Dragger::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&
                 if (_draggerActive)
                 {
                     _pointer._hitIter = _pointer._hitList.begin();
-                    _pointer.setCamera(view->getCamera());
+//                    _pointer.setCamera(view->getCamera());
                     _pointer.setMousePosition(ea.getX(), ea.getY());
 
                     handle(_pointer, ea, aa);