Added support for intesecting Drawable that are attached directly to the scene graph without an osg::Geode

include/osgUtil/IntersectVisitor

@@ -141,6 +141,7 @@ class OSGUTIL_EXPORT IntersectVisitor : public osg::NodeVisitor
         virtual float getDistanceToEyePoint(const osg::Vec3& pos, bool withLODScale) const;
 
         virtual void apply(osg::Node&);
+        virtual void apply(osg::Drawable&);
         virtual void apply(osg::Geode& node);
         virtual void apply(osg::Billboard& node);
 

include/osgUtil/IntersectionVisitor

@@ -258,6 +258,7 @@ class OSGUTIL_EXPORT IntersectionVisitor : public osg::NodeVisitor
     public:
 
         virtual void apply(osg::Node& node);
+        virtual void apply(osg::Drawable& drawable);
         virtual void apply(osg::Geode& geode);
         virtual void apply(osg::Billboard& geode);
         virtual void apply(osg::Group& group);

src/osgUtil/IntersectVisitor.cpp

@@ -399,7 +399,6 @@ void IntersectVisitor::apply(Node& node)
     leaveNode();
 }
 
-
 struct TriangleHit
 {
     TriangleHit(unsigned int index, const osg::Vec3& normal, float r1, const osg::Vec3* v1, float r2, const osg::Vec3* v2, float r3, const osg::Vec3* v3):
@@ -661,6 +660,12 @@ bool IntersectVisitor::intersect(Drawable& drawable)
 
 }
 
+
+void IntersectVisitor::apply(Drawable& drawable)
+{
+    intersect(drawable);
+}
+
 void IntersectVisitor::apply(Geode& geode)
 {
     if (!enterNode(geode)) return;

src/osgUtil/IntersectionVisitor.cpp

@@ -223,6 +223,11 @@ void IntersectionVisitor::apply(osg::Group& group)
     leave();
 }
 
+void IntersectionVisitor::apply(osg::Drawable& drawable)
+{
+    intersect( &drawable );
+}
+
 void IntersectionVisitor::apply(osg::Geode& geode)
 {
     // OSG_NOTICE<<"apply(Geode&)"<<std::endl;