At this moment, there is only Maxwell render for Rhino for mac. 
http://support.nextlimit.com/display/mxdocsv3/Rhinoceros+for+Mac
no any plugin! 
At this moment, there is only Maxwell render for Rhino for mac. 
http://support.nextlimit.com/display/mxdocsv3/Rhinoceros+for+Mac
no any plugin! 