Code Cleanups

- add initializers to classes
- fix %i/%u for unsigned ints
- remove unused vars
- pass by reference

code/ColladaExporter.cpp

@@ -167,8 +167,6 @@ void ColladaExporter::WriteHeader()
 	std::time_t date = std::time(NULL);
 	std::strftime(date_str, date_nb_chars, "%Y-%m-%dT%H:%M:%S", std::localtime(&date));
 
-	std::string scene_name = mScene->mRootNode->mName.C_Str();
-
 	aiVector3D scaling;
 	aiQuaternion rotation;
 	aiVector3D position;
@@ -622,8 +620,6 @@ void ColladaExporter::WriteMaterials()
 {
   materials.resize( mScene->mNumMaterials);
 
-  std::set<std::string> material_names;
-
   /// collect all materials from the scene
   size_t numTextures = 0;
   for( size_t a = 0; a < mScene->mNumMaterials; ++a )