I don't know off the top of my head, I just used Unreal as a hypothetical example. The UDK master thread is probably a good place to check. You typically have to set up your 3d package to use the same unit scale as the engine you are using. UDK Master Thread http://boards.polycount.net/showthread.php?t=67290
The recent thread asking how to maintain texel density got me thinking, as many of the answers were needlessly complex or the opposite, i.e. just eyeball it. There is actually a fairly accurate and artist friendly way to match a specified texel density, so I thought I would take the time to explain the method as well as…