The production software version zbrush 2018, the helmet is composed of multiple solid closed subtools, see the color block diagram, this is a high-model the poly amount has been moderately optimized by the Decimation master of zbrush, and there is no subdivision level, and no subdivision level. In addition, spread the UV well (except for the blindfold mesh without UV)。Output obj format, because the poly amount is too high, the poly amount are further reduced before output, and the poly acount of obj is 614758.remain UV.You can get more information from the preview pic.If any question please write to me.