Added set/getNearFarRatio() to CullVisitor.

include/osgUtil/CullVisitor

@@ -121,6 +121,10 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor, public osg::CullStac
         void setComputeNearFarMode(ComputeNearFarMode cnfm) { _computeNearFar=cnfm; } 
         ComputeNearFarMode getComputeNearFarMode() const { return _computeNearFar;} 
         
+        void setNearFarRatio(float ratio) { _nearFarRatio = ratio; }
+        float getNearFarRatio() const { return _nearFarRatio; }
+        
+
         /** Push state set on the current state group.
           * If the state exists in a child state group of the current
           * state group then move the current state group to that child.
@@ -245,6 +249,7 @@ class OSGUTIL_EXPORT CullVisitor : public osg::NodeVisitor, public osg::CullStac
         RenderBin*                                                  _currentRenderBin;
 
         ComputeNearFarMode  _computeNearFar;
+        float               _nearFarRatio;
         float               _computed_znear;
         float               _computed_zfar;