Object lost by rendering

I try to use Brazil for rhino,and start rendaring.
Today,I have a question.
Please tell me why desks top lost at by rendaring.
before rendaring

after rendaring

Thank you for reading.

See if selecting the top surfaces of your desks and using _Flip on them helps.

Hi @avungyerd
You should also try _SelBadObjects to see if maybe objects are bad. I’m guessing they are meshes, maybe even from some vendor - and they tend to sometimes be… not so good (aka rubbish). Usually running _MeshRepair on them will help identify/rectify the problem.
HTH, Jakob

thank you for your advice!

I repair my data!
Thank you!