Big difference in rendering

hello
in the perspective window I have this.
orbitor stern - YouTube

and with render I have this ?!

orbitor.3dm (3.5 MB)

Hi -
You appear to be running Rhino 7.1. Please update to the current 7.9 version. If that doesn’t help, please run the Rhino SystemInfo command and copy-paste the result here.
-wim

great
it works
:+1: thank you