diff --git a/include/osg/Drawable b/include/osg/Drawable
index 382a49641..cb9824680 100644
--- a/include/osg/Drawable
+++ b/include/osg/Drawable
@@ -384,6 +384,9 @@ class SG_EXPORT Drawable : public Object
             implemented by subclasses.*/
         virtual bool computeBound() const;
         
+        /** set the bounding box .*/
+        void setBound(const BoundingBox& bb) const;
+ 
         void addParent(osg::Node* node);
         void removeParent(osg::Node* node);
 
diff --git a/src/osg/Drawable.cpp b/src/osg/Drawable.cpp
index 864ce8781..f79d2cbca 100644
--- a/src/osg/Drawable.cpp
+++ b/src/osg/Drawable.cpp
@@ -326,3 +326,8 @@ bool Drawable::computeBound() const
     return true;
 }
 
+void Drawable::setBound(const BoundingBox& bb) const
+{
+     _bbox = bb;
+     _bbox_computed = true;
+}