Updates to the light points support to improve the control of the blending of

light points with their background.

include/osgSim/LightPoint

@@ -24,9 +24,33 @@ class OSGSIM_EXPORT LightPoint
 {
     public:
 
+        enum BlendingMode
+        {
+            OPAQUE,
+            ADDITIVE,
+            BLENDED
+        };
+        
         LightPoint();
         
+        LightPoint(const osg::Vec3& position,
+                   const osg::Vec4& color);
+       
+        LightPoint(bool	    	    on,
+                   const osg::Vec3& position,
+                   const osg::Vec4& color,
+                   float            intensity=1.0f,
+                   float            radius=1.0f,
+                   float            maxPixelSize=30,
+                   Sector*          sector=0,
+                   BlinkSequence*   blinkSequence=0,
+                   BlendingMode     blendingMode=BLENDED);
+            
+
         LightPoint(const LightPoint& lp);
+        
+        LightPoint& operator = (const LightPoint& lp);
+
 
     	bool	    	    	    _on;
         osg::Vec3                   _position;
@@ -37,6 +61,8 @@ class OSGSIM_EXPORT LightPoint
 
         osg::ref_ptr<Sector>        _sector;
         osg::ref_ptr<BlinkSequence> _blinkSequence;
+
+    	BlendingMode                _blendingMode;
 };
 
 }