From Vivek Rajan, new osgManipulator library, with a few minor tweaks and rename for osgDragger to osgManipulator for build by Robert Osfield.

Vivek's email to osg-submissions:

"I'm happy to release the osgdragger nodekit to the OSG community. I
implemented the nodekit for my company, Fugro-Jason Inc., and they
have kindly agreed to open source it.

The nodekit contains a few draggers but it should be easy to build new
draggers on top of it. The design of the nodekit is based on a
SIGGRAPH 2002 course - "Design and Implementation of Direct
Manipulation in 3D". You can find the course notes at
http://www.pauliface.com/Sigg02/index.html. Reading pages 20 - 29 of
the course notes should give you a fair understanding of how the
nodekit works.

The source code also contains an example of how to use the draggers."

src/osgManipulator/Selection.cpp

@@ -0,0 +1,95 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
+ *
+ * This library is open source and may be redistributed and/or modified under
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * OpenSceneGraph Public License for more details.
+*/
+//osgManipulator - Copyright (C) 2007 Fugro-Jason B.V.
+
+#include <osgManipulator/Selection>
+#include <osgManipulator/Command>
+
+#include <algorithm>
+
+using namespace osgManipulator;
+
+class FindNodePathToRootVisitor : public osg::NodeVisitor
+{
+    public:
+        
+        osg::NodePath& _nodePathToRoot;
+
+        FindNodePathToRootVisitor(osg::NodePath& np) 
+            : osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_PARENTS), 
+              _nodePathToRoot(np)
+        {}
+
+        virtual void apply(osg::Node& node)
+        {
+            _nodePathToRoot.push_back(&node);
+            traverse(node);
+        }
+};
+
+void osgManipulator::computeNodePathToRoot(osg::Node& node, osg::NodePath& np)
+{
+    np.clear();
+    osg::ref_ptr<FindNodePathToRootVisitor> visitor = new FindNodePathToRootVisitor(np);
+    node.accept(*visitor);
+    np.pop_back();
+    std::reverse(np.begin(), np.end());
+}
+
+Selection::Selection()
+{
+}
+
+Selection::~Selection()
+{
+}
+
+bool Selection::receive(const MotionCommand& command)
+{
+    switch (command.getStage())
+    {
+        case MotionCommand::START:
+            {
+                // Save the current matrix
+                _startMotionMatrix = getMatrix();
+
+                // Get the LocalToWorld and WorldToLocal matrix for this node.
+                osg::NodePath nodePathToRoot;
+                computeNodePathToRoot(*this,nodePathToRoot);
+                _localToWorld = osg::computeLocalToWorld(nodePathToRoot);
+                _worldToLocal = osg::Matrix::inverse(_localToWorld);
+
+                return true;
+            }
+        case MotionCommand::MOVE:
+            {
+                // Transform the command's motion matrix into local motion matrix.
+                osg::Matrix localMotionMatrix = _localToWorld * command.getWorldToLocal()
+                                                * command.getMotionMatrix()
+                                                * command.getLocalToWorld() * _worldToLocal;
+
+                // Transform by the localMotionMatrix
+                setMatrix(localMotionMatrix * _startMotionMatrix);
+
+                return true;
+            }
+        case MotionCommand::FINISH:
+            {
+                return true; 
+            }
+        case MotionCommand::NONE:
+        default:
+            return false;
+    }
+}
+