From 7b826228bbb506469f91215c01b375ad4965fe91 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 28 Sep 2004 07:15:01 +0000
Subject: [PATCH] From Brad Christiansen, fix expandBy(const BoundingSphere&)
 method to properly handle the instance of when the two bounding sphere's have
 a coincident center.

---
 src/osg/BoundingSphere.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/osg/BoundingSphere.cpp b/src/osg/BoundingSphere.cpp
index d54a676a4..dbb2da779 100644
--- a/src/osg/BoundingSphere.cpp
+++ b/src/osg/BoundingSphere.cpp
@@ -60,7 +60,11 @@ void BoundingSphere::expandBy(const BoundingSphere& sh)
         {
             Vec3 dv = sh._center-_center;
             float dv_len = dv.length();
-            if (dv_len+sh._radius>_radius)
+            
+            if(dv_len == 0 && sh._radius>_radius) {
+               _radius = sh._radius;
+            } 
+            else if (dv_len+sh._radius>_radius)
             {
                 Vec3 e1 = _center-(dv*(_radius/dv_len));
                 Vec3 e2 = sh._center+(dv*(sh._radius/dv_len));