ok now I see that i have to explode component/group first. is that the only solutions. thanks!!

forgot to mention that I actually flip all the faces. would the be because of the material name?

thanks for the exporter; however I have tried it but found some issue when importing certain images texture. it showed several images as the default material. therefore I could not separate about 4-5 diffrent mapping. I never used ealier version before but compare with obj exporter for the same ...