3DS: Pass default material name to Material constructor

code/3DSLoader.cpp

@@ -346,7 +346,7 @@ void Discreet3DSImporter::ParseObjectChunk()
     case Discreet3DS::CHUNK_MAT_MATERIAL:
 
         // Add a new material to the list
-        mScene->mMaterials.push_back(D3DS::Material());
+        mScene->mMaterials.push_back(D3DS::Material(std::string("UNNAMED_" + std::to_string(mScene->mMaterials.size()))));
         ParseMaterialChunk();
         break;