Thanks for that info, but I think that you misunderstand what I wanted to tell, sorry for that I didn’t make it clear.
So here is what I want. I want a blurry glass which has blur effect like Gaussian blur filter. So I found this:So Blurred glass material is impossible in Unreal Engine 4? - Rendering - Unreal Engine Forums
The replies by RyanB are really helpful and it is really good actually and looks like Gaussian blur, so I want to use that custom node to make blurry effect. However, the thing is there was a problem occurred during the test I made.
In this screenshot: Imgur: The magic of the Internet
As I’ve written on it, there will always be a white area when viewport or camera clips with glass mesh. I just want to get rid of it.