STL to STEP

Hello everyone,

I import stl file with method RWStl::ReadFile because I have a large size STL so old fashion way takes (I mean StlAPI_Reader) too much time. And after import stl file want to convert to STEP file. But I couldn't convert that . In writer.Transfer section status returns fail. For any idea I will be appreciated.

        TCollection_AsciiString theFileName = Utilities::ToAsciiString(inp);
	auto aTris = RWStl::ReadFile(theFileName.ToCString(), 0.1);
	auto face = TopoDS_Face();
	auto aBuilder = BRep_Builder();
	aBuilder.MakeFace(face, aTris);

        STEPControl_Writer writer;

	IFSelect_ReturnStatus status = writer.Transfer(face, STEPControl_ManifoldSolidBrep);
	const TCollection_AsciiString asciiExportPath = Utilities::ToAsciiString(exportPath);
	status = writer.Write(asciiExportPath.ToCString());

	return true;