Added the beginnings of a new osgforest example.

Added support into osg::TriangleFunctor for specifying whether the vertices
being generates are temporary or not.

src/osgUtil/IntersectVisitor.cpp

@@ -369,7 +369,7 @@ struct TriangleIntersect
     }
 
     //   bool intersect(const Vec3& v1,const Vec3& v2,const Vec3& v3,float& r)
-    inline void operator () (const Vec3& v1,const Vec3& v2,const Vec3& v3)
+    inline void operator () (const Vec3& v1,const Vec3& v2,const Vec3& v3, bool treatVertexDataAsTemporary)
     {
         ++_index;
 
@@ -465,8 +465,15 @@ struct TriangleIntersect
             osg::notify(WARN)<<"   ("<<r1<<",\t"<<r2<<",\t"<<r3<<")"<<std::endl;
             return;
         }
-
-        _thl.insert(std::pair<const float,TriangleHit>(r,TriangleHit(_index-1,normal,r1,&v1,r2,&v2,r3,&v3)));
+        
+        if (treatVertexDataAsTemporary)
+        {
+            _thl.insert(std::pair<const float,TriangleHit>(r,TriangleHit(_index-1,normal,r1,0,r2,0,r3,0)));
+        }
+        else
+        {
+            _thl.insert(std::pair<const float,TriangleHit>(r,TriangleHit(_index-1,normal,r1,&v1,r2,&v2,r3,&v3)));
+        }
         _hit = true;
 
     }