You can take screenshots at any resolution and save to your hard disc. You have an option to use your viewport resolution, or take highres screenshot at custom resolution. You can also Show UI elements in your screenshots. I have used OpenCV library to capture entire window, so if you are showing UI elements, you need to play in a seperate standalone window, not in your viewport, and you cannot take highres screenshots in this case.

Taking Screenshot is not an instant process and there may be a noticeable time difference between the frame at which the screenshot is requested and the frame at which the screencapture is finished, specially when you have requested a screen capture at a high resolution (4K and above). To facilitate the process, I have created an actor called AFrameCaptureActor, which is responsible for requesting for screen capture and broadcast notification once the screen capture is finished. You can either choose to save the screenshot in hard disc or display the result as texture in viewport UI. This actor also records videos, and we will see how in the next section.

Spawning the FrameCapture Actor

Before you can request your viewport client for a screen capture, you need to spawn an instance of AFrameCaptureActor class. I have created a widget and I am spawning this actor in the Construct event, and saving the spawned actor in a variable for later use.

Requesting a new Screen Capture

Once you have a valid spawned FrameCapture actor, you are allowed to request for a new screen capture. For initializing a new screen capture, you need to get a reference of your spawned FrameCapture actor, and call the function InitializeScreenCapture.

Binding the ScreenshotSaved Event

Since capturing screenshot is not an instant process and happens asynchronously, you have to bind the OnScreenshotSaved event of your FrameCapture actor to get notified to when the screenshot is saved.

To take Screenshots with your UI elements visible, you don't need the FramCapture actor, you just need to call the function TakeSnapshotwithUI and specify the filename where you want to save the file.

Instead of saving screenshots to the hard disc, you can also save your screenshot as textures and display as your UMG elements. Here also you have an option to display your UI elements.

Initializing a new Screen Capture

Assuming you already have a spawned a new instance of FrameCapture actor, here also at first you need to initialize a new screen capture by calling the function InitializeScreenCapture. But here you don't have to specify any filename and don't check the SaveToDisk option

Binding the ScreenCaptured Event

Once the screen capture is initialized, you need to bind the OnScreenCaptured event of your FrameCapture actor to get notified once the screen is successfully captured. This event will return texture format as output converted from the current viewport pixels. You can then use the texture (UTexture2D) to display in yuor UI.

You can load image files from hard disc and display as texture in your UI. This is a very useful features for instances like displaying thumbnails for saved game files, or loading and displaying avatars for MMORPG games.

To load an image file from your hard disc, you need to call the function LoadTexturefromPath and specify the full filename of the image file to be loaded.

You can record video at desired frame rate and save to your hard disc. Video recording is done at viewport resolution only. You also have an option to show your UI elements in the recorded video. The actor AFrameCaptureActor, is responsible for recording new videos as well.

Spawning the FrameCapture Actor

Before you can request your viewport client for a new video record, you need to spawn an instance of AFrameCaptureActor class. You can spawn it wherever you like, in your widget class or maybe in your character class like what I am doing here, and save the spawned actor in a variable.

Initializing the Recorder

Once you have a valid spawned FrameCapture actor, you can now start recording your video sequence. For initializing recording of a new sequence , you need to get a reference of your spawned FrameCapture actor, and call the function. InitializeRecorder. Video is always recorded at your viewport's resolution.

Pause the Resume Recording

You can pause and resume recording anytime adter the video recording is initialized, by get a reference of your spawned FrameCapture actor and calling the function TogglePauseRecorder.

Stop Recording

To stop recording, get your FrameCapture actor and call the function StopRecorder. This must be done in order to release the video file that was currently being written.

Thank you for your time. I hope you find this plugin useful. For technical difficulties, feedback, suggestions, queries, kindly drop me a mail at sameek4@gmail.com. I would love to hear from you.