c++ vectors struct dilemma

[aabbas27]

i want to know what the struct is being used for if everything is being stored in the tmp variables and pushed into the vectors, why is vector<type> given as struct e.g vector<faces>, and what happens to the variables in struct if everything is inserted in the vectors? what are the variables in struct used for? I would be grateful if u can help me understand that
thanks please look at the code in the link below

http://pastebin.com/6Q7zS7tC