Ask About rendering Glass Material(ask)

Hi its ask about a glass material.

in Cycles render or blender render its okay it shows how i want. But in Cycles Render-Rendered it shows like that
Why Rendered won’t show glass ? Maybe two glass material causes that ? There is two faces at outside (humans face sees that ) and the other side which one looks to outside. Help :frowning:

show nodes set up for glass
but should try to add some transparency to output

happy cl

But i will export it into Unreal Engine 4 . Will it accept that ?