outMtl << "# Material Count: " << (const Unsigned)materials.size() << "\n\n";
for ( std::set<std::string>::const_iterator it( materials.begin() ); it != materials.end(); ++it )
{
outMtl << "# Material Count: " << (const Unsigned)materials.size() << "\n\n";
for ( std::set<std::string>::const_iterator it( materials.begin() ); it != materials.end(); ++it )
{