It's that way. If you need work in your project with no smoothed image just let that option disabled. 
It works by project, not by material.
Check this old thread to see some pictures and the original discussion about it.
	
	
	
It works by project, not by material.
Check this old thread to see some pictures and the original discussion about it.
	
 @MicheusVieira   
 @MicheusVieira   
 Micheuss   
 micheus4wings3d