Added new Node::getParentalNodePaths() method.

Added better handling in computeIntersections(..) of nodes that are internal
to the scene graph, correctly accounting for the accumulated transforms.

Changed the EventVisitor so that it only traveses active children rather than
all children.

Updated wrappers.

include/osg/Node

@@ -28,6 +28,14 @@ namespace osg {
 class NodeVisitor;
 class Group;
 class Transform;
+class Node;
+
+/** A vector of Nodes pointers which is used to describe the path from a root node to a descendant.*/
+typedef std::vector< Node* > NodePath;
+
+/** A vector of NodePath, typically used to describe all the paths from a node to the potential root nodes it has.*/
+typedef std::vector< NodePath > NodePathList;
+
 
 /** META_Node macro define the standard clone, isSameKindAs, className
   * and accept methods.  Use when subclassing from Node to make it
@@ -103,6 +111,7 @@ class OSG_EXPORT Node : public Object
         inline ParentList getParents() { return _parents; }
 
         inline Group* getParent(unsigned int i)  { return _parents[i]; }
+
         /**
          * Get a single const parent of node.
          * @param i index of the parent to get.
@@ -116,6 +125,10 @@ class OSG_EXPORT Node : public Object
          */
         inline unsigned int getNumParents() const { return _parents.size(); }
 
+        /** Get the list of node paths parent paths.
+          * The optional Node* haltTraversalAtNode allows the user to prevent traversal beyond a specifed node. */
+        NodePathList getParentalNodePaths(osg::Node* haltTraversalAtNode=0) const;
+
 
         /** Set update node callback, called during update traversal. */
         void setUpdateCallback(NodeCallback* nc);
@@ -337,9 +350,6 @@ class OSG_EXPORT Node : public Object
 
 };
 
-/** A vector of Nodes pointers which is used to describe the path from a root node to a descendant.*/
-typedef std::vector<Node*> NodePath;
-
 }
 
 #endif

src/osg/Node.cpp

@@ -21,6 +21,36 @@
 
 using namespace osg;
 
+namespace osg
+{
+    /// Helper class for generating NodePathList.
+    class CollectParentPaths : public NodeVisitor
+    {
+    public:
+        CollectParentPaths(osg::Node* haltTraversalAtNode=0) : 
+            osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_PARENTS),
+            _haltTraversalAtNode(haltTraversalAtNode)
+        {
+        }
+
+        virtual void apply(osg::Node& node)
+        {
+            if (node.getNumParents()==0 || &node==_haltTraversalAtNode)
+            {
+                _nodePaths.push_back(getNodePath());
+            }
+            else
+            {
+                traverse(node);
+            }
+       }
+
+        Node*           _haltTraversalAtNode;
+        NodePath        _nodePath;
+        NodePathList    _nodePaths;
+    };
+}
+
 Node::Node()
 {
     _boundingSphereComputed = false;
@@ -133,6 +163,12 @@ osg::StateSet* Node::getOrCreateStateSet()
     return _stateset.get();
 }
 
+NodePathList Node::getParentalNodePaths(osg::Node* haltTraversalAtNode) const
+{
+    CollectParentPaths cpp(haltTraversalAtNode);
+    const_cast<Node*>(this)->accept(cpp);
+    return cpp._nodePaths;
+}
 
 void Node::setUpdateCallback(NodeCallback* nc)
 {

src/osg/NodeTrackerCallback.cpp

@@ -21,26 +21,6 @@
 
 using namespace osg;
 
-class CollectParentPaths : public osg::NodeVisitor
-{
-public:
-    CollectParentPaths() : 
-        osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_PARENTS) {}
-        
-    virtual void apply(osg::Node& node)
-    {
-        if (node.getNumParents()==0)
-        {
-            _nodePaths.push_back(getNodePath());
-        }
-        traverse(node);
-   }
-    
-    osg::NodePath _nodePath;
-    typedef std::vector< osg::NodePath > NodePathList;
-    NodePathList _nodePaths;
-};
-
 class ApplyMatrixVisitor : public NodeVisitor
 {
     public:
@@ -88,13 +68,12 @@ void NodeTrackerCallback::setTrackNode(osg::Node* node)
         return;
     }
 
-    CollectParentPaths cpp;
-    node->accept(cpp);
+    NodePathList parentNodePaths = node->getParentalNodePaths();
 
-    if (!cpp._nodePaths.empty())
+    if (!parentNodePaths.empty())
     {
         osg::notify(osg::INFO)<<"NodeTrackerCallback::setTrackNode(Node*): Path set"<<std::endl;
-        _trackNodePath = cpp._nodePaths[0];
+        _trackNodePath = parentNodePaths[0];
     }
     else
     {

src/osgGA/EventVisitor.cpp

@@ -18,7 +18,7 @@ using namespace osg;
 using namespace osgGA;
 
 EventVisitor::EventVisitor()
-:    NodeVisitor(EVENT_VISITOR,TRAVERSE_ALL_CHILDREN),
+:    NodeVisitor(EVENT_VISITOR,TRAVERSE_ACTIVE_CHILDREN),
     _handled(false)
 {
 }

src/osgProducer/Viewer.cpp

@@ -741,7 +741,7 @@ bool Viewer::computeNearFarPoints(float x,float y,unsigned int cameraNum,osg::Ve
 bool Viewer::computeIntersections(float x,float y,unsigned int cameraNum,osg::Node* node,osgUtil::IntersectVisitor::HitList& hits,osg::Node::NodeMask traversalMask)
 {
     float pixel_x,pixel_y;
-    if (computePixelCoords(x,y,cameraNum,pixel_x,pixel_y))
+    if (node && computePixelCoords(x,y,cameraNum,pixel_x,pixel_y))
     {
 
         Producer::Camera* camera=getCamera(cameraNum);
@@ -751,11 +751,13 @@ bool Viewer::computeIntersections(float x,float y,unsigned int cameraNum,osg::No
         osg::Matrixd proj;
         osg::Matrixd view;
         const osg::Viewport* viewport = 0;
+        osg::Node* rootNode = 0; 
         if (sv!=0)
         {
             viewport = sv->getViewport();
             proj = sv->getProjectionMatrix();
             view = sv->getViewMatrix();
+            rootNode = sv->getSceneData();
         }
         else
         {
@@ -764,19 +766,37 @@ bool Viewer::computeIntersections(float x,float y,unsigned int cameraNum,osg::No
             view = osg::Matrixd(camera->getViewMatrix());
         }
 
-        osgUtil::PickVisitor pick(viewport, proj, view, pixel_x, pixel_y);
-        pick.setTraversalMask(traversalMask);
-        node->accept(pick);
-        
-        // copy all the hits across to the external hits list
-        for(osgUtil::PickVisitor::LineSegmentHitListMap::iterator itr = pick.getSegHitList().begin();
-            itr != pick.getSegHitList().end();
-            ++itr)
+        unsigned int numHitsBefore = hits.size();
+
+        osg::NodePathList parentNodePaths = node->getParentalNodePaths(rootNode);
+        for(unsigned int i=0;i<parentNodePaths.size();++i)
         {
-            hits.insert(hits.end(),itr->second.begin(), itr->second.end());
+            osg::NodePath& nodePath = parentNodePaths[i];
+            
+            // remove the intersection node from the nodePath as it'll be accounted for
+            // in the PickVisitor traversal, so we don't double account for its transform.
+            if (!nodePath.empty()) nodePath.pop_back();  
+            
+            osg::Matrixd modelview(view);
+            // modify the view matrix so that it accounts for this nodePath's accumulated transform
+            if (!nodePath.empty()) modelview.preMult(computeLocalToWorld(nodePath));
+            
+            osgUtil::PickVisitor pick(viewport, proj, modelview, pixel_x, pixel_y);
+            pick.setTraversalMask(traversalMask);
+            node->accept(pick);
+
+            // copy all the hits across to the external hits list
+            for(osgUtil::PickVisitor::LineSegmentHitListMap::iterator itr = pick.getSegHitList().begin();
+                itr != pick.getSegHitList().end();
+                ++itr)
+            {
+                hits.insert(hits.end(),itr->second.begin(), itr->second.end());
+            }
+
         }
         
-        return true;
+        // return true if we now have more hits than before
+        return hits.size()>numHitsBefore;
     }
     return false;
 }

src/osgWrappers/osg/Node.cpp

@@ -55,6 +55,7 @@ BEGIN_OBJECT_REFLECTOR(osg::Node)
 	I_Method1(osg::Group *, getParent, IN, unsigned int, i);
 	I_Method1(const osg::Group *, getParent, IN, unsigned int, i);
 	I_Method0(unsigned int, getNumParents);
+	I_MethodWithDefaults1(osg::NodePathList, getParentalNodePaths, IN, osg::Node *, haltTraversalAtNode, 0);
 	I_Method1(void, setUpdateCallback, IN, osg::NodeCallback *, nc);
 	I_Method0(osg::NodeCallback *, getUpdateCallback);
 	I_Method0(const osg::NodeCallback *, getUpdateCallback);
@@ -123,7 +124,11 @@ END_REFLECTOR
 
 TYPE_NAME_ALIAS(std::vector< osg::Node * >, osg::NodePath);
 
+TYPE_NAME_ALIAS(std::vector< osg::NodePath >, osg::NodePathList);
+
 STD_VECTOR_REFLECTOR(std::vector< osg::Group * >);
 
+STD_VECTOR_REFLECTOR(std::vector< osg::NodePath >);
+
 STD_VECTOR_REFLECTOR(std::vector< std::string >);
 

src/osgWrappers/osgTerrain/DataSet.cpp

@@ -337,6 +337,8 @@ BEGIN_OBJECT_REFLECTOR(osgTerrain::DataSet::Source)
 	I_Method0(const std::string &, getFileName);
 	I_Method1(void, setTemporaryFile, IN, bool, temporaryFile);
 	I_Method0(bool, getTemporaryFile);
+	I_Method1(void, setGdalDataSet, IN, GDALDataset *, gdalDataSet);
+	I_Method0(GDALDataset *, getGdalDataSet);
 	I_Method1(void, setCoordinateSystemPolicy, IN, osgTerrain::DataSet::Source::ParameterPolicy, policy);
 	I_Method0(osgTerrain::DataSet::Source::ParameterPolicy, getCoordinateSystemPolicy);
 	I_Method1(void, setCoordinateSystem, IN, const std::string &, wellKnownText);
@@ -371,6 +373,7 @@ BEGIN_OBJECT_REFLECTOR(osgTerrain::DataSet::Source)
 	I_Property(osg::CoordinateSystemNode *, CoordinateSystem);
 	I_Property(osgTerrain::DataSet::Source::ParameterPolicy, CoordinateSystemPolicy);
 	I_Property(const std::string &, FileName);
+	I_Property(GDALDataset *, GdalDataSet);
 	I_Property(osg::Matrixd &, GeoTransform);
 	I_Property(osgTerrain::DataSet::Source::ParameterPolicy, GeoTransformPolicy);
 	I_Property(unsigned int, Layer);