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Pixel Streaming is crashing on emitUIInteraction() after using open level

Version: 4.21.2-4753647+++UE4+Release-4.21


if have set up a scene for testing pixel streaming.

I have mapped two keys to change levels using an "Open Level" node. So pressing button A opens level A. And pressing button B opens level B. The setup works fine even inside pixel streaming.

However, i'm trying to practise some player page to ue4 communication now.

I am using emitUIInteraction(); to send strings to the engine, triggering a custom event bund to OnPixelStreamingInputEvent, to finally open a level. This only works once. Subsequent calls are either ignored or crashes the engine altogether.

Since pixel streaming works fine as long as i do not use javascript input, i suspect the error is perhaps in apps.js. But i can not see it.

Any help is kindly appreciated. Thank you!


Product Version: UE 4.21
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asked Feb 06 '19 at 03:16 PM in Using UE4

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avatar image Derek Hunter Feb 11 '19 at 01:20 PM

I am also having this exact same problem:

  1. Pixel-streaming starts in 'LevelOne'.

  2. Trigger emitUIInteraction() in the browser.

  3. The custom event in LevelOne gets the message and calls 'Open Level' to switch levels to 'LevelTwo'.

  4. Trigger emitUIInteraction() in the browser - with the intention of going back to LevelOne.

  5. Nothing happens. The custom event in LevelTwo does not get called.

So long as I don't use 'Open Level' to change levels I can trigger emitUIInteraction() multiple times in the browser and the custom event is called successfully to stream levels.

Has anyone got pixel-streaming to work with more than one call to 'Open Level'?

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