Zbrush | How to use double or flip under display properties

female model instead of hiding them so let’s turn it off now by clicking on the eye icon on the sub tool layer let’s turn on double so that we can see the bottom of the top surface on second thought let’s flip both surfaces instead when you look up from the bottom of the skirt it should be see-through similar to when you look down from the top of the skirt it should be transparent so i will keep both surfaces empty when you look from the top and the bottom so that we can see through them go under tool and under display properties turn on double so that we can view both surfaces now turn double off and we can see the opaque surfaces of the top top of the skirt facing outwards and the opaque surface of the bottom of the skirt facing outwards and under display properties we click flip once we can flip both surfaces so that the transparent side faces outwards and opaque sides face inwards and if you rotate to view from the top you can only see the bottom surface and then if you rotate view from the bottom you can only see the top surface this is what