I have used the quick transformer to convert Revit file to IFC format. The log message said the features were converted successfully but when I open the output, no features was found.

Hi @jackpkwong​, a Revit to IFC Conversion requires a bit more complex workspace in FME and requires more data transformation than just that possible with the quick translator. Jovita posted a great response in this thread that I think will help you along the way: https://community.safe.com/s/question/0D54Q000080hHaZSAU/revit-to-ifc-quick-translator-issue

We also have a great series of tutorials on BIM conversions: https://community.safe.com/s/article/bim-tutorial

Hope this helps!