Checkerboard behind material preview missing?

I swear there was one in Udk but I cant seem to find the one in Rocket.

Which checkerboard are you talking about? If you mean the checkerboard behind the texture in the texture editor, that’s still there, you can find it by toggling the “Checkers” button (as long as the texture you’re looking at has an alpha channel and is partially transparent).

Oh I see there is one in the Texture viewer but not in the material editor. I checked UDK so it must have been 3dsmax I was thinking about, the checker texture helps to test reflective strength as well as alpha materials.