From a8aa77b1b23fae131d9a0aa229716ba451924711 Mon Sep 17 00:00:00 2001
From: Stuart Buchanan <stuart_d_buchanan@yahoo.co.uk>
Date: Sun, 1 Aug 2021 20:52:25 +0100
Subject: [PATCH] WS30: Fix crash on reset caused by VPBTechnique

---
 src/Main/fg_init.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index 23e4a04a3..b021caa93 100755
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -68,6 +68,7 @@
 #include <simgear/scene/model/particles.hxx>
 #include <simgear/scene/tgdb/TreeBin.hxx>
 #include <simgear/scene/tgdb/userdata.hxx>
+#include <simgear/scene/tgdb/VPBTechnique.hxx>
 #include <simgear/scene/tsync/terrasync.hxx>
 
 #include <simgear/package/Root.hxx>
@@ -1311,6 +1312,7 @@ void fgStartNewReset()
 
     simgear::clearSharedTreeGeometry();
     simgear::clearEffectCache();
+    simgear::VPBTechnique::clearElevationConstraints();
     simgear::SGModelLib::resetPropertyRoot();
     simgear::ParticlesGlobalManager::clear();
     simgear::UniformFactory::instance()->reset();