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How do I regain control of the UI in UE4 after hitting the Play button?

this is a newbie question i am following the first example in the docs where you build a simple house assign some materials add a few lights etc... anyway when i run the process building there is no problems but when i hit play i get a red error message that's says that some lights need to be rebuild the problem is i have no idea on how to regain control of the UI in UE4 i can navigate in the editor but there is no mouse cursor and also some of the lights icons still appear after the process building, help i am new at this and would very much appreciate a response.


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asked May 22 '14 at 01:50 AM in Using UE4

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Francois M.
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You can hit escape to stop Play mode, or press Shift+F1 to regain mouse control from Play mode while it is running.

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answered May 22 '14 at 01:52 AM

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avatar image Ben Halliday STAFF May 22 '14 at 02:10 PM

Hey Chez,

As ShinAli mentions, you can exit Play or Simulation mode by pressing Escape, or regain the cursor by pressing Shift+F1.

You mention the red text on the screen telling you that lighting needs to be rebuilt. This happens when you move an Actor in the level while you have a Static light in the world, because it needs to re-bake the shadows for the moved Actor. The Build button in the Toolbar has a drop-down menu from which you can select Build Lighting Only. Do that before you hit Play and you shouldn't see that error. You won't be able to build lighting while the game is running, though.

Does that answer your question?

Ben Halliday

avatar image Francois M. May 23 '14 at 10:53 AM

yes it does but what about the lights icons that still show up after process building ?

avatar image Ben Halliday STAFF May 23 '14 at 04:15 PM

Do you mean the icons in the Viewport while editing? Those are there to show you where the lights are in your level. They should not be there while you are playing.

If you'd like, you can choose to hide or resize those icons, which are called Sprites in UE4. To hide them, click the Show button in the Viewport and go to Sprites > Lighting. To resize them, you'll need to select each one you want resized and in the Details panel under Rendering, adjust the Editor Billboard Scale.

Hope that helps!

Ben Halliday

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