You need some kind of volumetric mesh if you don’t want to see the “inside”. You can use CSG to generate the holes. See for eg (from Drawing outside edges of a Mesh created from CSG - #25 by Evgeni_Popov):
You need some kind of volumetric mesh if you don’t want to see the “inside”. You can use CSG to generate the holes. See for eg (from Drawing outside edges of a Mesh created from CSG - #25 by Evgeni_Popov):