fixed mesh loading, added sword mesh

data/bak/sword.mtl

@@ -0,0 +1,9 @@
+#
+# generated by kHED
+#
+newmtl steel
+d 1.0
+map_Kd steel.jpg
+newmtl leather
+d 1.0
+map_Kd leather.jpg

src/scene/gibgeneratornode.cpp

@@ -38,10 +38,10 @@ void GibGeneratorNode::update()
         Gib *g = *it;
         if(g->expiration < getEngine().getTime())
         {
-            removeChild(g->graphics);
-            delete g->graphics;
-            it = m_gibs.erase(it);
             getEngine().getPhysics()->removeCollisionObject(g->body);
+            removeChild(g->graphics);
+            it = m_gibs.erase(it);
+            delete g->graphics;
             delete g;
         }
         else

src/scene/graphicalcontainernode.cpp

@@ -3,7 +3,7 @@
 
 GraphicalContainerNode::~GraphicalContainerNode()
 {
-    setVisible(false); // renderer de-indexing
+    setSceneTree(nullptr);
     for(GraphicalNode* child : m_children)
         delete child;
 }