From da2ee04eeadf74f686e3f60d7ead5b550738a80f Mon Sep 17 00:00:00 2001
From: ThorstenB <brehmt@gmail.com>
Date: Sat, 7 Apr 2012 16:35:04 +0200
Subject: [PATCH] Fix scenery reload issues. Aircraft could fall through the
 ground on scenery reload.

---
 src/Scenery/tilemgr.cxx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Scenery/tilemgr.cxx b/src/Scenery/tilemgr.cxx
index 876826d5f..0f566485b 100644
--- a/src/Scenery/tilemgr.cxx
+++ b/src/Scenery/tilemgr.cxx
@@ -101,8 +101,10 @@ void FGTileMgr::refresh_tile(void* tileMgr, long tileIndex)
 
 void FGTileMgr::reinit()
 {
-    // reset flag, stop FDM processing, otherwise aircraft fall through
-    // the ground while reloading scenery
+    // protect against multiple scenery reloads and properly reset flags,
+    // otherwise aircraft fall through the ground while reloading scenery
+    if (!fgGetBool("/sim/sceneryloaded",true))
+        return;
     fgSetBool("/sim/sceneryloaded",false);
     fgSetDouble("/sim/startup/splash-alpha", 1.0);