Try to fix a leak

code/AssetLib/X3D/X3DImporter_Geometry3D.cpp

@@ -897,7 +897,8 @@ void X3DImporter::readSphere(XmlNode &node) {
         StandardShapes::MakeSphere(tess, tlist);
         // copy data from temp array and apply scale
         for (std::vector<aiVector3D>::iterator it = tlist.begin(); it != tlist.end(); ++it) {
-            ((X3DNodeElementGeometry3D *)ne)->Vertices.push_back(*it * radius);
+            aiVector3D v = *it;
+            ((X3DNodeElementGeometry3D *)ne)->Vertices.emplace_back(v * radius);
         }
 
         ((X3DNodeElementGeometry3D *)ne)->Solid = solid;

code/AssetLib/X3D/X3DImporter_Node.hpp

@@ -108,6 +108,10 @@ struct X3DNodeElementBase {
     std::list<X3DNodeElementBase *> Children;
     X3DElemType Type;
 
+    virtual ~X3DNodeElementBase() {
+        // empty
+    }
+
 protected:
     X3DNodeElementBase(X3DElemType type, X3DNodeElementBase *pParent) :
             Parent(pParent), Type(type) {