Added new Node/Drawable::s/getInitialBound and Node/Drawable::s/getComputeBoundCallback

methods and reimplement computeBound so that it passes back a bounding volume rather
than modifying the local one.

include/osgSim/Impostor

@@ -100,12 +100,12 @@ class OSGSIM_EXPORT Impostor : public osg::LOD
         /** Get a const list of ImpostorSprites attached to this const Impostor. */
         inline const ImpostorSpriteList& getImpostorSpriteList(unsigned int contexID) const { return _impostorSpriteListBuffer[contexID]; }
 
+        virtual osg::BoundingSphere computeBound() const;
+        
     protected :
 
         virtual ~Impostor() {}
 
-        virtual bool computeBound() const;
-        
         mutable osg::buffered_object<ImpostorSpriteList>  _impostorSpriteListBuffer;
         
 

include/osgSim/ImpostorSprite

@@ -148,6 +148,8 @@ class OSGSIM_EXPORT ImpostorSprite : public osg::Drawable
         // for debugging purposes.
         osg::Vec4 _color;
 
+        virtual osg::BoundingBox computeBound() const;
+
     protected:
 
         ImpostorSprite(const ImpostorSprite&):Drawable() {}
@@ -155,8 +157,6 @@ class OSGSIM_EXPORT ImpostorSprite : public osg::Drawable
 
         virtual ~ImpostorSprite();
 
-        virtual bool computeBound() const;
-
         Impostor* _parent;
 
         friend class osgSim::ImpostorSpriteManager;

include/osgSim/LightPointNode

@@ -82,6 +82,8 @@ class OSGSIM_EXPORT LightPointNode : public osg::Node
 
         osgSim::LightPointSystem* getLightPointSystem() { return _lightSystem.get(); }
 
+        virtual osg::BoundingSphere computeBound() const;
+
     protected:
 
         ~LightPointNode() {}
@@ -90,8 +92,6 @@ class OSGSIM_EXPORT LightPointNode : public osg::Node
         // view frustum check. 
         mutable osg::BoundingBox _bbox;
 
-        virtual bool computeBound() const;
-
         LightPointList  _lightPointList;
 
         float _minPixelSize;