+ else if(str.size()==6 && !str.compare(0, 5, "GROUP") && str[5]>='1' && str[5]<='4')
+ a = static_cast<VertexAttribute>(GROUP1+(str[5]-'1'));
+ else if(str.size()==7 && !str.compare(0, 6, "WEIGHT") && str[6]>='1' && str[6]<='4')
+ a = static_cast<VertexAttribute>(WEIGHT1+(str[6]-'1'));