Fix crash when multiple scenewidgets were closed. BtOgre was destroying resources each time.

apps/opencs/view/world/physicsengine.cpp

@@ -11,6 +11,8 @@
 
 #include <components/nifbullet/bulletnifloader.hpp>
 #include <openengine/bullet/BulletShapeLoader.h>
+#include <OgreSceneNode.h>
+#include <openengine/bullet/BtOgreExtras.h> // needs Ogre::SceneNode defined
 
 // PLEASE NOTE:
 //
@@ -199,6 +201,17 @@ namespace CSVWorld
         {
             delete (*iter).second;
             mDebugDrawers.erase(iter);
+
+            // BtOgre::DebugDrawer destroys the resources leading to crashes in some
+            // situations.  Workaround by recreating them each time.
+            if (!Ogre::ResourceGroupManager::getSingleton().resourceGroupExists("BtOgre"))
+                Ogre::ResourceGroupManager::getSingleton().createResourceGroup("BtOgre");
+            if (!Ogre::MaterialManager::getSingleton().resourceExists("BtOgre/DebugLines"))
+            {
+                Ogre::MaterialPtr mat = Ogre::MaterialManager::getSingleton().create("BtOgre/DebugLines", "BtOgre");
+                mat->setReceiveShadows(false);
+                mat->setSelfIllumination(1,1,1);
+            }
         }
 
         std::map<Ogre::SceneManager *, Ogre::SceneNode *>::iterator it =

apps/opencs/view/world/physicsengine.hpp

@@ -9,8 +9,6 @@
 //#include <string>
 //#include "BulletCollision/CollisionShapes/btScaledBvhTriangleMeshShape.h"
 //#include <boost/shared_ptr.hpp>
-#include <OgreSceneNode.h>
-#include <openengine/bullet/BtOgreExtras.h> // needs Ogre::SceneNode defined
 
 //#include <OgreVector3.h>
 //#include <OgreQuaternion.h>