Game Development Reference
In the drop-down menu for the viewport, there are opions of what you want to display.
It allows you to hide/unhide speciic elements in your perspecive viewport, which is very
useful when you are working on a speciic element during your level creaion:
Real Time Preview ( RTP ) shows the environment as it would look like in the game, complete
with sound and paricle efects. RTP works best when you have the Game Mode ( G ) enabled,
which turns of the wireframe brush view . This offers the best and most accurate view of
what your level will look like in the game.
Here is a list of the diferent viewport opions you will be using when designing in UDK. Some
of you will use one more than the others: