From dc40db3b33b3d0cf3ab3f49e80715368b53cdf65 Mon Sep 17 00:00:00 2001
From: curt <curt>
Date: Fri, 26 Jul 2002 22:23:49 +0000
Subject: [PATCH] Modified the partial ssg tree deletion algorithm so it
 correctly preserves subtrees that may be connected into the scene graph
 multiple times. (i.e.  our random ground cover objects.)

---
 src/Scenery/tileentry.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Scenery/tileentry.cxx b/src/Scenery/tileentry.cxx
index 97d5d372e..b6bb04198 100644
--- a/src/Scenery/tileentry.cxx
+++ b/src/Scenery/tileentry.cxx
@@ -702,7 +702,7 @@ static int fgPartialFreeSSGtree( ssgBranch *b, int n ) {
         int num_deletes = 0;
         for ( int i = 0; i < b->getNumKids(); ++i ) {
             ssgEntity *kid = b->getKid(i);
-            if ( kid->isAKindOf( ssgTypeBranch() ) ) {
+            if ( kid->isAKindOf( ssgTypeBranch() ) && kid->getRef() <= 1 ) {
                 int result = fgPartialFreeSSGtree( (ssgBranch *)kid, n );
                 num_deletes += result;
                 n -= result;
-- 
2.39.5