From f46bda0621652380b4f06684c6453a1cef48c2d1 Mon Sep 17 00:00:00 2001
From: ehofman <ehofman>
Date: Wed, 4 Jun 2003 09:57:11 +0000
Subject: [PATCH] A bounding sphere may be empty, which is perfectly valid.
 Such empty spheres have negative radius, but undefined center.

---
 src/Scenery/hitlist.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Scenery/hitlist.cxx b/src/Scenery/hitlist.cxx
index 856b175a2..630e6685e 100644
--- a/src/Scenery/hitlist.cxx
+++ b/src/Scenery/hitlist.cxx
@@ -348,7 +348,8 @@ void FGHitList::IntersectBranch( ssgBranch *branch, sgdMat4 m,
             kid != NULL;
             kid = branch->getNextKid() )
     {
-        if ( kid->getTraversalMask() & SSGTRAV_HOT )
+        if ( kid->getTraversalMask() & SSGTRAV_HOT
+             && !kid->getBSphere()->isEmpty() )
         {
             sgdVec3 center;
             sgdSetVec3( center,