Addressed a number of memory leaks identified in unit tests by asan

code/B3DImporter.cpp

@@ -82,6 +82,20 @@ static const aiImporterDesc desc = {
 
 //#define DEBUG_B3D
 
+template<typename T>
+void DeleteAllBarePointers(std::vector<T>& x)
+{
+    for(auto p : x)
+    {
+        delete p;
+    }
+}
+
+B3DImporter::~B3DImporter()
+{
+    DeleteAllBarePointers(_animations);
+}
+
 // ------------------------------------------------------------------------------------------------
 bool B3DImporter::CanRead( const std::string& pFile, IOSystem* /*pIOHandler*/, bool /*checkSig*/) const{
 
@@ -558,13 +572,19 @@ aiNode *B3DImporter::ReadNODE( aiNode *parent ){
 void B3DImporter::ReadBB3D( aiScene *scene ){
 
     _textures.clear();
+
     _materials.clear();
 
     _vertices.clear();
+
     _meshes.clear();
 
+    DeleteAllBarePointers(_nodes);
     _nodes.clear();
+
     _nodeAnims.clear();
+
+    DeleteAllBarePointers(_animations);
     _animations.clear();
 
     string t=ReadChunk();

code/B3DImporter.h

@@ -59,6 +59,8 @@ namespace Assimp{
 
 class B3DImporter : public BaseImporter{
 public:
+    B3DImporter() = default;
+    virtual ~B3DImporter();
 
     virtual bool CanRead( const std::string& pFile, IOSystem* pIOHandler, bool checkSig) const;
 

code/PretransformVertices.cpp

@@ -634,7 +634,7 @@ void PretransformVertices::Execute( aiScene* pScene)
         aiNode* newRoot = new aiNode();
         newRoot->mName = pScene->mRootNode->mName;
         delete pScene->mRootNode;
-        pScene->mRootNode = new aiNode();
+        pScene->mRootNode = newRoot;
 
         if (1 == pScene->mNumMeshes && !pScene->mNumLights && !pScene->mNumCameras)
         {