if (threadsGiven) metric->SetNumberOfThreads( threads );
#else
if (m_Verbose) std::cout<<"Not setting the number of threads (not compiled with USE_OPTIMIZED_REGISTRATION_METHODS)..."<<std::endl;
if (threadsGiven) metric->SetNumberOfThreads( threads );
#else
if (m_Verbose) std::cout<<"Not setting the number of threads (not compiled with USE_OPTIMIZED_REGISTRATION_METHODS)..."<<std::endl;