Is it possible to build a square in ue4 and make it so only side is visible and the other sides are invisible?

Is it possible to build a square in ue4 and make it so only one side is visible and the other sides are invisible?

put on all sides but 1 side Material M.Glass and put watever Material on the other side

does that help?

A couple of ideas here, you should be able to take your cube and set the vertex color for the alpha to black for the back of the cube. I know you can do it with Maya, using the vertex/face mode to set the values for the hard edges, to avoid the fade on the side, but the easiest answer would seem to be to just make a cube for the custom collision model and make a face for the front face, that way there is no object to fade out.