i made the real time render with the Backface culling and solidfy
https://drive.google.com/file/d/0B7yIQ0LAJGEPZGJlNjdzd3E4VDA/view?usp=sharing
but when i render it, it goes all black
https://drive.google.com/file/d/0B7yIQ0LAJGEPWGR5Nm9ZMVZBTWM/view?usp=sharing
any way to fix this?